Package org.assertj.core.api

Class AbstractCharSequenceAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>

    • Constructor Detail

      • AbstractCharSequenceAssert

        public AbstractCharSequenceAssert​(ACTUAL actual,
                                  Class<?> selfType)

    • Method Detail

      • isNullOrEmpty

        public void isNullOrEmpty()
        Verifies that the actual CharSequence is empty, i.e., it has a length of 0, or is null.

        If you do not want to accept a null value, use isEmpty() instead.

        Both of these assertions will succeed: 

         String emptyString = ""
 assertThat(emptyString).isNullOrEmpty();

 String nullString = null;
 assertThat(nullString).isNullOrEmpty();
        Whereas these assertions will fail: 
         assertThat("a").isNullOrEmpty();
 assertThat("   ").isNullOrEmpty();
        Specified by:
        isNullOrEmpty in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Throws:
        AssertionError - if the actual CharSequence has a non-zero length.

      • isEmpty

        public void isEmpty()
        Verifies that the actual CharSequence is empty, i.e., it has a length of 0 and is not null.

        If you want to accept a null value as well as a 0 length, use isNullOrEmpty() instead.

        This assertion will succeed: 

         String emptyString = ""
 assertThat(emptyString).isEmpty();
        Whereas these assertions will fail: 
         String nullString = null;
 assertThat(nullString).isEmpty();
 assertThat("a").isEmpty();
 assertThat("   ").isEmpty();
        Specified by:
        isEmpty in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Throws:
        AssertionError - if the actual CharSequence has a non-zero length or is null.

      • isNotEmpty

        public SELF isNotEmpty()
        Verifies that the actual CharSequence is not empty, i.e., is not null and has a length of 1 or more.

        This assertion will succeed: 

         String bookName = "A Game of Thrones"
 assertThat(bookName).isNotEmpty();
        Whereas these assertions will fail: 
         String emptyString = ""
 assertThat(emptyString).isNotEmpty();

 String nullString = null;
 assertThat(nullString).isNotEmpty();
        Specified by:
        isNotEmpty in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is empty (has a length of 0).

      • isBlank

        public SELF isBlank()
        Verifies that the actual CharSequence is blank, i.e. is null, empty or consists of one or more whitespace characters (according to Character.isWhitespace(char)).

        The definition of this method has changed, the old behaviour is now under containsOnlyWhitespaces().

        These assertions succeed: 

         assertThat(" ").isBlank();
 assertThat("").isBlank();
 assertThat("    ").isBlank();
 String nullString = null;
 assertThat(nullString).isBlank();
        Whereas these assertions fail: 
         assertThat("a").isBlank();
 assertThat(" b").isBlank();
 assertThat(" c ").isBlank();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not blank.
        Since:
        2.6.0 / 3.6.0

      • isNotBlank

        public SELF isNotBlank()
        Verifies that the actual CharSequence is:

        The definition of this method has changed, the old behaviour is now under doesNotContainOnlyWhitespaces().

        These assertions succeed: 

         assertThat("a").isNotBlank();
 assertThat(" b").isNotBlank();
 assertThat(" c ").isNotBlank();
        Whereas these assertions fail: 
         assertThat(" ").isNotBlank();
 assertThat("").isNotBlank();
 assertThat("    ").isNotBlank();
 String nullString = null;
 assertThat(nullString).isNotBlank();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is blank.
        Since:
        2.6.0 / 3.6.0

      • containsWhitespaces

        public SELF containsWhitespaces()
        Verifies that the actual CharSequence contains one or more whitespace characters (according to Character.isWhitespace(char)).

        These assertions will succeed: 

         assertThat(" ").containsWhitespaces();
 assertThat("a b").containsWhitespaces();
 assertThat(" c ").containsWhitespaces();
        Whereas these assertions will fail: 
         assertThat("").containsWhitespaces();
 assertThat("a").containsWhitespaces();
 String nullString = null;
 assertThat(nullString).containsWhitespaces();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence does not contain any whitespace characters.
        Since:
        3.11.0

      • containsOnlyWhitespaces

        public SELF containsOnlyWhitespaces()
        Verifies that the actual CharSequence consists of one or more whitespace characters (according to Character.isWhitespace(char)).

        These assertions will succeed: 

         assertThat(" ").containsOnlyWhitespaces();
 assertThat("    ").containsOnlyWhitespaces();
        Whereas these assertions will fail: 
         assertThat("a").containsOnlyWhitespaces();
 assertThat("").containsOnlyWhitespaces();
 assertThat(" b").containsOnlyWhitespaces();
 assertThat(" c ").containsOnlyWhitespaces();

 String nullString = null;
 assertThat(nullString).containsOnlyWhitespaces();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not blank.
        Since:
        2.9.0 / 3.9.0

      • doesNotContainAnyWhitespaces

        public SELF doesNotContainAnyWhitespaces()
        Verifies that the actual CharSequence is either null, empty or does not contain any whitespace characters (according to Character.isWhitespace(char)).

        These assertions will succeed: 

         assertThat("a").doesNotContainAnyWhitespaces();
 assertThat("").doesNotContainAnyWhitespaces();
 assertThat("ab").doesNotContainAnyWhitespaces();

 String nullString = null;
 assertThat(nullString).doesNotContainAnyWhitespaces();
        Whereas these assertions will fail: 
         assertThat(" ").doesNotContainAnyWhitespaces();
 assertThat(" a").doesNotContainAnyWhitespaces();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence contains one or more whitespace characters.
        Since:
        3.11.0

      • doesNotContainOnlyWhitespaces

        public SELF doesNotContainOnlyWhitespaces()
        Verifies that the actual CharSequence is either:

        The main difference with isNotBlank() is that it accepts null or empty CharSequence.

        These assertions will succeed: 

         assertThat("a").doesNotContainOnlyWhitespaces();
 assertThat("").doesNotContainOnlyWhitespaces();
 assertThat(" b").doesNotContainOnlyWhitespaces();
 assertThat(" c ").doesNotContainOnlyWhitespaces();
 String nullString = null;
 assertThat(nullString).doesNotContainOnlyWhitespaces();
        Whereas these assertions will fail: 
         assertThat(" ").doesNotContainOnlyWhitespaces();
 assertThat("    ").doesNotContainOnlyWhitespaces();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is blank.
        Since:
        2.9.0 / 3.9.0

      • isJavaBlank

        @Deprecated
public SELF isJavaBlank()
        Deprecated.
        Use isBlank() instead.
        Verifies that the actual CharSequence is blank, i.e. consists of one or more whitespace characters (according to Character.isWhitespace(char)).

        These assertions will succeed: 

         assertThat(" ").isJavaBlank();
 assertThat("     ").isJavaBlank();
        Whereas these assertions will fail: 
         assertThat("a").isJavaBlank();
 assertThat(" b").isJavaBlank();
 assertThat("").isJavaBlank();
 String nullString = null;
 assertThat(nullString).isJavaBlank();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not blank.
        Since:
        2.6.0 / 3.6.0

      • isNotJavaBlank

        @Deprecated
public SELF isNotJavaBlank()
        Deprecated.
        Use isNotBlank() instead.
        Verifies that the actual CharSequence is not blank, i.e. either is null, empty or contains at least one non-whitespace character (according to Character.isWhitespace(char)).

        These assertions will succeed: 

         assertThat("a").isNotJavaBlank();
 assertThat(" b").isNotJavaBlank();
 assertThat(" c ").isNotJavaBlank();
 assertThat("").isNotJavaBlank();
 String nullString = null;
 assertThat(nullString).isNotJavaBlank();
        Whereas these assertions will fail: 
         assertThat(" ").isNotJavaBlank();
 assertThat("   ").isNotJavaBlank();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is blank.
        Since:
        2.6.0 / 3.6.0

      • hasSize

        public SELF hasSize​(int expected)
        Verifies that the actual CharSequence has the expected length using the length() method.

        This assertion will succeed: 

         String bookName = "A Game of Thrones"
 assertThat(bookName).hasSize(17);
        Whereas this assertion will fail: 
         String bookName = "A Clash of Kings"
 assertThat(bookName).hasSize(4);
        Specified by:
        hasSize in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        expected - the expected length of the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual length is not equal to the expected length.

      • hasSizeLessThan

        public SELF hasSizeLessThan​(int expected)
        Verifies that the actual CharSequence has has a length less than the given value using the length() method.

        This assertion will succeed: 

        assertThat("abc").hasSizeLessThan(4);
        Whereas this assertion will fail: 
        assertThat("abc").hasSizeLessThan(3);
        Specified by:
        hasSizeLessThan in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        expected - the expected maximum length of the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual length is equal or greater than the expected length.
        Since:
        3.12.0

      • hasSizeLessThanOrEqualTo

        public SELF hasSizeLessThanOrEqualTo​(int expected)
        Verifies that the actual CharSequence has a length less than or equal to the given value using the length() method.

        This assertion will succeed: 

        assertThat("abc").hasSizeLessThanOrEqualTo(3);
        Whereas this assertion will fail: 
        assertThat("abc").hasSizeLessThanOrEqualTo(2);
        Specified by:
        hasSizeLessThanOrEqualTo in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        expected - the expected maximum length of the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual length is greater than the expected length.
        Since:
        3.12.0

      • hasSizeGreaterThan

        public SELF hasSizeGreaterThan​(int expected)
        Verifies that the actual CharSequence has a length greater than the given value using the length() method.

        This assertion will succeed: 

        assertThat("abcs").hasSizeGreaterThan(2);
        Whereas this assertion will fail: 
        assertThat("abc").hasSizeGreaterThan(3);
        Specified by:
        hasSizeGreaterThan in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        expected - the expected minimum length of the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual length is equal or less than the expected length.
        Since:
        3.12.0

      • hasSizeGreaterThanOrEqualTo

        public SELF hasSizeGreaterThanOrEqualTo​(int expected)
        Verifies that the actual CharSequence has a length greater than or equal to the given value using the length() method.

        This assertion will succeed: 

        assertThat("abc").hasSizeGreaterThanOrEqualTo(3);
        Whereas this assertion will fail: 
        assertThat("abc").hasSizeGreaterThanOrEqualTo(3);
        Specified by:
        hasSizeGreaterThanOrEqualTo in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        expected - the expected minimum length of the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual length is less than the expected length.
        Since:
        3.12.0

      • hasSizeBetween

        public SELF hasSizeBetween​(int lowerBoundary,
                           int higherBoundary)
        Verifies that the actual CharSequence has length between the given boundaries (inclusive) using the length() method.

        This assertion will succeed: 

         String bookName = "A Game of Thrones"
 assertThat(bookName).hasSizeBetween(5, 25);
 assertThat(bookName).hasSizeBetween(16, 17);
        Whereas this assertion will fail: 
         String bookName = "A Clash of Kings"
 assertThat(bookName).hasSizeBetween(2, 5);
        Specified by:
        hasSizeBetween in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        lowerBoundary - the lower boundary compared to which actual length should be greater than or equal to.
        higherBoundary - the higher boundary compared to which actual length should be less than or equal to.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual length is not between the boundaries.
        Since:
        3.12.0

      • hasLineCount

        public SELF hasLineCount​(int expectedLineCount)
        Verifies that the actual CharSequence has the expected line count.

        A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed (see LineNumberReader).

        This assertion will succeed: 

         String multiLine = "First line\n" +
                    "Last line";
 assertThat(multiLine).hasLineCount(2);
        Whereas this assertion will fail: 
         String bookName = "A Clash of Kings";
 assertThat(bookName).hasLineCount(3);
        Parameters:
        expectedLineCount - the expected line count of the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual line count is not equal to the expected one.

      • hasSameSizeAs

        public SELF hasSameSizeAs​(CharSequence other)
        Verifies that the actual CharSequence has a length that's the same as the length of the given CharSequence.

        Examples : 

         // assertion will pass
 assertThat("C-3PO").hasSameSizeAs("R2-D2");

 // assertion will fail as actual and expected sizes differ
 assertThat("C-3PO").hasSameSizeAs("B1 battle droid");
        Parameters:
        other - the given CharSequence to be used for size comparison.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence has a length that's different from the length of the given CharSequence.
        NullPointerException - if the given CharSequence is null.

      • hasSameSizeAs

        public SELF hasSameSizeAs​(Object other)
        Verifies that the actual CharSequence has a length that's the same as the number of elements in the given array.

        Example: 

         // assertion will pass
 assertThat("12").hasSameSizeAs(new char[] { 'a', 'b' });

 // assertion will fail
 assertThat("12").hasSameSizeAs(new char[] { 'a', 'b', 'c' });
        Specified by:
        hasSameSizeAs in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        other - the given array to be used for size comparison.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence has a length that's different from the number of elements in the array.
        NullPointerException - if the given array is null.

      • hasSameSizeAs

        public SELF hasSameSizeAs​(Iterable<?> other)
        Verifies that the actual CharSequence has a length that's the same as the number of elements in the given Iterable.

        Example: 

         // assertion will pass
 assertThat("abc").hasSameSizeAs(Arrays.asList(1, 2, 3));

 // assertion will fail
 assertThat("ab").hasSameSizeAs(Arrays.asList(1, 2, 3));
        Specified by:
        hasSameSizeAs in interface EnumerableAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        other - the given Iterable to be used for size comparison.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence has a length that's different from the number of elements in the Iterable.
        NullPointerException - if the given Iterable is null.

      • isEqualToIgnoringCase

        public SELF isEqualToIgnoringCase​(CharSequence expected)
        Verifies that the actual CharSequence is equal to the given one, ignoring case considerations.

        Example : 

         // assertion will pass
 assertThat("Gandalf the grey").isEqualToIgnoringCase("GaNdAlF tHe GREY");
 assertThat("Gandalf the grey").isEqualToIgnoringCase("Gandalf the grey");

 // assertion will fail
 assertThat("Gandalf the grey").isEqualToIgnoringCase("Gandalf the white");
        Parameters:
        expected - the given CharSequence to compare the actual CharSequence to.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not equal to the given one.

      • isNotEqualToIgnoringCase

        public SELF isNotEqualToIgnoringCase​(CharSequence expected)
        Verifies that the actual CharSequence is not equal to the given one, ignoring case considerations.

        Example : 

         // assertions will pass
 assertThat("Gandalf").isNotEqualToIgnoringCase("Hobbit");
 assertThat("Gandalf").isNotEqualToIgnoringCase("HOBit");
 assertThat((String) null).isNotEqualToIgnoringCase("Gandalf");
 assertThat("Gandalf").isNotEqualToIgnoringCase(null);

 // assertions will fail
 assertThat("Gandalf").isNotEqualToIgnoringCase("Gandalf");
 assertThat("Gandalf").isNotEqualToIgnoringCase("GaNDalf");
 assertThat((String) null).isNotEqualToIgnoringCase(null);
        Parameters:
        expected - the given CharSequence to compare the actual CharSequence to.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not equal to the given one.

      • containsOnlyDigits

        public SELF containsOnlyDigits()
        Verifies that the actual CharSequence contains only digits. It fails if it contains non-digit characters or is empty.

        This assertion succeeds: 

         assertThat("10").containsOnlyDigits();
        Whereas these assertions fail: 
         assertThat("10$").containsOnlyDigits();
 assertThat("").containsOnlyDigits();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence contains non-digit characters or is null.

      • containsOnlyOnce

        public SELF containsOnlyOnce​(CharSequence sequence)
        Verifies that the actual CharSequence contains the given sequence only once.

        Example : 

         // assertion will pass
 assertThat("Frodo").containsOnlyOnce("do");

 // assertions will fail
 assertThat("Frodo").containsOnlyOnce("o");
 assertThat("Frodo").containsOnlyOnce("y");
        Parameters:
        sequence - the sequence to search for.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence either does not contain the given one at all, or contains it more than once.

      • contains

        public SELF contains​(CharSequence... values)
        Verifies that the actual CharSequence contains all the given values.

        You can use one or several CharSequences as in this example: 

         assertThat("Gandalf the grey").contains("alf");
 assertThat("Gandalf the grey").contains("alf", "grey");
        Parameters:
        values - the Strings to look for.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given list of values is null.
        IllegalArgumentException - if the list of given values is empty.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence does not contain all the given strings.

      • contains

        public SELF contains​(Iterable<? extends CharSequence> values)
        Verifies that the actual CharSequence contains all the CharSequences of the given Iterable.

        Examples: 

         assertThat("Gandalf the grey").contains(Arrays.asList("alf"));
 assertThat("Gandalf the grey").contains(Arrays.asList("alf", "grey"));
        Parameters:
        values - the Strings to look for.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given list of values is null.
        IllegalArgumentException - if the list of given values is empty.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence does not contain all the given values.

      • containsSequence

        public SELF containsSequence​(CharSequence... values)
        Verifies that the actual CharSequence contains the given sequence of values in the given order without any other values between them.

        Breaking change since 2.9.0: in previous versions this assertion behaved like containsSubsequence and allowed other values between the sequence values.

        Example: 

         String book = "{ 'title':'A Game of Thrones', 'author':'George Martin'}";

 // this assertion succeeds
 assertThat(book).containsSequence("'title'", ":", "'A Game of Thrones'");

 // this assertion will fail because there are values between the expected sequence (e.g "'title':'")
 assertThat(book).containsSequence("{", "A Game of Thrones", "George Martin", "}");

 // this one fails as ":" must come after "'title'"
 assertThat(book).containsSequence(":", "'title'", "'A Game of Thrones'");
        Parameters:
        values - the sequence of charSequence to look for, in order.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given sequence of charSequence is null.
        IllegalArgumentException - if the given sequence of charSequence is empty.
        AssertionError - if the given CharSequence is null.
        AssertionError - if the given CharSequence does not contain the given sequence of values in the given order without any other values between them.

      • containsSequence

        public SELF containsSequence​(Iterable<? extends CharSequence> values)
        Verifies that the actual CharSequence contains all the values of the given Iterable in the Iterable iteration order without any other values between them.

        Breaking change since 2.9.0: in previous versions this assertion behaved like containsSubsequence and allowed other values between the sequence values.

        Example: 

         String book = "{ 'title':'A Game of Thrones', 'author':'George Martin'}";

 // this assertion succeeds
 assertThat(book).containsSequence(asList("'title'", ":", "'A Game of Thrones'"));

 // this assertion will fail because there are values between the expected sequence (e.g "'title':'")
 assertThat(book).containsSequence(asList("{", "A Game of Thrones", "George Martin", "}"));

 // this one fails as "author" must come after "A Game of Thrones"
 assertThat(book).containsSequence(asList("author", "A Game of Thrones"));
        Parameters:
        values - the sequence of charSequence to look for, in order.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given sequence of charSequence is null.
        IllegalArgumentException - if the given sequence of charSequence is empty.
        AssertionError - if the given CharSequence is null.
        AssertionError - if the given CharSequence does not contain the given sequence of values in the given order without any other charvalues between them.

      • containsSubsequence

        public SELF containsSubsequence​(CharSequence... values)
        Verifies that the actual CharSequence contains all the given values in the given order, possibly with other values between them.

        Example: 

         String book = "{ 'title':'A Game of Thrones', 'author':'George Martin'}";

 // this assertion succeeds
 assertThat(book).containsSubsequence("'title'", ":", "'A Game of Thrones'");

 // these ones succeed even if there are values between the given values
 assertThat(book).containsSubsequence("{", "A Game of Thrones", "George Martin", "}");
 assertThat(book).containsSubsequence("A", "Game", "of", "George");

 // this one fails as "author" must come after "A Game of Thrones"
 assertThat(book).containsSubsequence("{", "author", "A Game of Thrones", "}");
        Parameters:
        values - the Strings to look for, in order.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given values is null.
        IllegalArgumentException - if the given values is empty.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence does not contain all the given values in the given order.

      • containsSubsequence

        public SELF containsSubsequence​(Iterable<? extends CharSequence> values)
        Verifies that the actual CharSequence contains all the values of the given Iterable in the Iterable iteration order (possibly with other values between them).

        Example: 

         String book = "{ 'title':'A Game of Thrones', 'author':'George Martin'}";

 // this assertion succeeds
 assertThat(book).containsSubsequence(asList("'title'", ":", "'A Game of Thrones'"));

 // these ones succeed even if there are values between the given values
 assertThat(book).containsSubsequence(asList("{", "A Game of Thrones", "George Martin", "}"));
 assertThat(book).containsSubsequence(asList("A", "Game", "of", "George"));

 // but this one fails as "author" must come after "A Game of Thrones"
 assertThat(book).containsSubsequence(asList("{", "author", "A Game of Thrones", "}"));
        Parameters:
        values - the Strings to look for, in order.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given values is null.
        IllegalArgumentException - if the given values is empty.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence does not contain all the given values in the given order.

      • containsIgnoringCase

        public SELF containsIgnoringCase​(CharSequence sequence)
        Verifies that the actual CharSequence contains the given sequence, ignoring case considerations.

        Example : 

         // assertion will pass
 assertThat("Gandalf the grey").containsIgnoringCase("gandalf");

 // assertion will fail
 assertThat("Gandalf the grey").containsIgnoringCase("white");
        Parameters:
        sequence - the sequence to search for.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given sequence is null.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence does not contain the given one.

      • doesNotContain

        public SELF doesNotContain​(CharSequence... values)
        Verifies that the actual CharSequence does not contain any of the given values.

        Example : 

         // assertion will pass
 assertThat("Frodo").doesNotContain("pippin")
                    .doesNotContain("fro", "sam");


 // assertion will fail
 assertThat("Frodo").doesNotContain("Fro", "Gimli", "Legolas");
        Parameters:
        values - the CharSequences to search for.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given list of values is null.
        IllegalArgumentException - if the list of given values is empty.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence contains any of the given values.

      • doesNotContain

        public SELF doesNotContain​(Iterable<? extends CharSequence> values)
        Verifies that the actual CharSequence does not contain any of the given Iterable.

        Example : 

         // assertion will pass
 assertThat("Frodo").doesNotContain(Arrays.asList(""))
                    .doesNotContain(Arrays.asList("fro", "sam"));

 // assertion will fail
 assertThat("Frodo").doesNotContain(Arrays.asList("Fro", "Gimli", "Legolas"));
        Parameters:
        values - the CharSequences to search for.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given list of values is null.
        IllegalArgumentException - if the list of given values is empty.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence contains any of the given values.

      • doesNotContainPattern

        public SELF doesNotContainPattern​(CharSequence pattern)
        Verifies that the actual CharSequence does not contain the given regular expression.

        Example : 

         // assertion will pass
 assertThat("Frodo").doesNotContainPattern("Fr.ud");

 // assertion will fail
 assertThat("Freud").doesNotContainPattern("Fr.ud");
        Parameters:
        pattern - the regular expression to find in the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given pattern is null.
        PatternSyntaxException - if the regular expression's syntax is invalid.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the given regular expression can be found in the actual CharSequence.
        Since:
        2.7.0 / 3.7.0

      • doesNotContainPattern

        public SELF doesNotContainPattern​(Pattern pattern)
        Verifies that the actual CharSequence does not contain the given regular expression.

        Example : 

         // assertion will pass
 assertThat("Frodo").doesNotContainPattern(Pattern.compile("Fr.ud"));

 // assertion will fail
 assertThat("Freud").doesNotContainPattern(Pattern.compile("Fr.ud"));
        Parameters:
        pattern - the regular expression to find in the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given pattern is null.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the given regular expression can be found in the actual CharSequence.
        Since:
        2.7.0 / 3.7.0

      • startsWith

        public SELF startsWith​(CharSequence prefix)
        Verifies that the actual CharSequence starts with the given prefix.

        Example : 

         // assertions will pass
 assertThat("Frodo").startsWith("Fro");
 assertThat("Gandalf the grey").startsWith("Gandalf");

 // assertions will fail
 assertThat("Frodo").startsWith("fro");
 assertThat("Gandalf the grey").startsWith("grey");
        Parameters:
        prefix - the given prefix.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given prefix is null.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence does not start with the given prefix.

      • doesNotStartWith

        public SELF doesNotStartWith​(CharSequence prefix)
        Verifies that the actual CharSequence does not start with the given prefix.

        Example: 

         // assertions will pass
 assertThat("Frodo").doesNotStartWith("fro");
 assertThat("Gandalf the grey").doesNotStartWith("grey");

 // assertions will fail
 assertThat("Gandalf the grey").doesNotStartWith("Gandalf");
 assertThat("Frodo").doesNotStartWith("");
        Parameters:
        prefix - the given prefix.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given prefix is null.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence starts with the given prefix.

      • endsWith

        public SELF endsWith​(CharSequence suffix)
        Verifies that the actual CharSequence ends with the given suffix.

        Example : 

         // assertion will pass
 assertThat("Frodo").endsWith("do");

 // assertion will fail
 assertThat("Frodo").endsWith("Fro");
        Parameters:
        suffix - the given suffix.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given suffix is null.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence does not end with the given suffix.

      • doesNotEndWith

        public SELF doesNotEndWith​(CharSequence suffix)
        Verifies that the actual CharSequence does not end with the given suffix.

        Example: 

         // assertion will pass
 assertThat("Frodo").doesNotEndWith("Fro");

 // assertions will fail
 assertThat("Frodo").doesNotEndWith("do");
 assertThat("Frodo").doesNotEndWith("");
        Parameters:
        suffix - the given suffix.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given suffix is null.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence ends with the given suffix.

      • matches

        public SELF matches​(CharSequence regex)
        Verifies that the actual CharSequence matches the given regular expression.

        Example : 

         // assertion will pass
 assertThat("Frodo").matches("..o.o");

 // assertion will fail
 assertThat("Frodo").matches(".*d");
        Parameters:
        regex - the regular expression to which the actual CharSequence is to be matched.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given pattern is null.
        PatternSyntaxException - if the regular expression's syntax is invalid.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence does not match the given regular expression.

      • doesNotMatch

        public SELF doesNotMatch​(CharSequence regex)
        Verifies that the actual CharSequence does not match the given regular expression.

        Example : 

         // assertion will pass
 assertThat("Frodo").doesNotMatch(".*d");

 // assertion will fail
 assertThat("Frodo").doesNotMatch("..o.o");
        Parameters:
        regex - the regular expression to which the actual CharSequence is to be matched.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given pattern is null.
        PatternSyntaxException - if the regular expression's syntax is invalid.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence matches the given regular expression.

      • matches

        public SELF matches​(Pattern pattern)
        Verifies that the actual CharSequence matches the given regular expression pattern.

        Example : 

         // assertion will pass
 assertThat("Frodo").matches(Pattern.compile("..o.o"));

 // assertion will fail
 assertThat("Frodo").matches(Pattern.compile(".*d"));
        Parameters:
        pattern - the regular expression to which the actual CharSequence is to be matched.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given pattern is null.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the actual CharSequence does not match the given regular expression.

      • doesNotMatch

        public SELF doesNotMatch​(Pattern pattern)
        Verifies that the actual CharSequence does not match the given regular expression pattern.

        Example : 

         // assertion will pass
 assertThat("Frodo").doesNotMatch(Pattern.compile(".*d"));

 // assertion will fail
 assertThat("Frodo").doesNotMatch(Pattern.compile("..o.o"));
        Parameters:
        pattern - the regular expression to which the actual CharSequence is to be matched.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given pattern is null.
        AssertionError - if the actual CharSequence does not match the given regular expression.

      • isXmlEqualTo

        public SELF isXmlEqualTo​(CharSequence expectedXml)
        Verifies that the actual CharSequence is equal to the given XML CharSequence after both have been formatted the same way.

        Example : 

         String expectedXml =
     "<rings>\n" +
         "  <bearer>\n" +
         "    <name>Frodo</name>\n" +
         "    <ring>\n" +
         "      <name>one ring</name>\n" +
         "      <createdBy>Sauron</createdBy>\n" +
         "    </ring>\n" +
         "  </bearer>\n" +
         "</rings>";

 // No matter how your xml string is formated, isXmlEqualTo is able to compare it's content with another xml String.
 String oneLineXml = "<rings><bearer><name>Frodo</name><ring><name>one ring</name><createdBy>Sauron</createdBy></ring></bearer></rings>";
 assertThat(oneLineXml).isXmlEqualTo(expectedXml);

 String xmlWithNewLine =
     "<rings>\n" +
         "<bearer>   \n" +
         "  <name>Frodo</name>\n" +
         "  <ring>\n" +
         "    <name>one ring</name>\n" +
         "    <createdBy>Sauron</createdBy>\n" +
         "  </ring>\n" +
         "</bearer>\n" +
         "</rings>";
 assertThat(xmlWithNewLine).isXmlEqualTo(expectedXml);

 // You can compare it with oneLineXml
 assertThat(xmlWithNewLine).isXmlEqualTo(oneLineXml);

 // Tip : use isXmlEqualToContentOf assertion to compare your XML String with the content of an XML file :
 assertThat(oneLineXml).isXmlEqualToContentOf(new File("src/test/resources/formatted.xml"));
        Parameters:
        expectedXml - the XML CharSequence to which the actual CharSequence is to be compared to.
        Returns:
        this assertion object to chain other assertions.
        Throws:
        NullPointerException - if the given CharSequence is null.
        AssertionError - if the actual CharSequence is null or is not the same XML as the given XML CharSequence.

      • isXmlEqualToContentOf

        public SELF isXmlEqualToContentOf​(File xmlFile)
        Verifies that the actual CharSequence is equal to the content of the given file.

        This is an handy shortcut that calls : isXmlEqualTo(contentOf(xmlFile))

        Example : 
         // You can easily compare your XML String to the content of an XML file, whatever how formatted they are.
 String oneLineXml = "<rings><bearer><name>Frodo</name><ring><name>one ring</name><createdBy>Sauron</createdBy></ring></bearer></rings>";
 assertThat(oneLineXml).isXmlEqualToContentOf(new File("src/test/resources/formatted.xml"));
        Parameters:
        xmlFile - the file to read the expected XML String to compare with actual CharSequence
        Returns:
        this assertion object to chain other assertions.
        Throws:
        NullPointerException - if the given File is null.
        AssertionError - if the actual CharSequence is null or is not the same XML as the content of given File.

      • usingComparator

        public SELF usingComparator​(Comparator<? super ACTUAL> customComparator)
        Description copied from class: AbstractAssert
        Use the given custom comparator instead of relying on actual type A equals method for incoming assertion checks.

        The custom comparator is bound to assertion instance, meaning that if a new assertion instance is created, the default comparison strategy will be used.

        Examples : 

         // frodo and sam are instances of Character with Hobbit race (obviously :).
 // raceComparator implements Comparator<Character>
 assertThat(frodo).usingComparator(raceComparator).isEqualTo(sam);
        Specified by:
        usingComparator in interface Assert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Overrides:
        usingComparator in class AbstractAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        customComparator - the comparator to use for the incoming assertion checks.
        Returns:
        this assertion object.

      • usingComparator

        public SELF usingComparator​(Comparator<? super ACTUAL> customComparator,
                            String customComparatorDescription)
        Description copied from class: AbstractAssert
        Use the given custom comparator instead of relying on actual type A equals method for incoming assertion checks.

        The custom comparator is bound to assertion instance, meaning that if a new assertion instance is created, the default comparison strategy will be used.

        Examples : 

         // frodo and sam are instances of Character with Hobbit race (obviously :).
 // raceComparator implements Comparator<Character>
 assertThat(frodo).usingComparator(raceComparator, "Hobbit Race Comparator").isEqualTo(sam);
        Specified by:
        usingComparator in interface Assert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Overrides:
        usingComparator in class AbstractAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Parameters:
        customComparator - the comparator to use for the incoming assertion checks.
        customComparatorDescription - comparator description to be used in assertion error messages
        Returns:
        this assertion object.

      • inHexadecimal

        public SELF inHexadecimal()
        Description copied from class: AbstractAssert
        Use hexadecimal object representation instead of standard representation in error messages.

        It can be useful when comparing UNICODE characters - many unicode chars have duplicate characters assigned, it is thus impossible to find differences from the standard error message:

        With standard message: 

         assertThat("µµµ").contains("μμμ");

 java.lang.AssertionError:
 Expecting:
   <"µµµ">
 to contain:
   <"μμμ">
        With Hexadecimal message: 
         assertThat("µµµ").inHexadecimal().contains("μμμ");

 java.lang.AssertionError:
 Expecting:
   <"['00B5', '00B5', '00B5']">
 to contain:
   <"['03BC', '03BC', '03BC']">
        Overrides:
        inHexadecimal in class AbstractAssert<SELF extends AbstractCharSequenceAssert<SELF,​ACTUAL>,​ACTUAL extends CharSequence>
        Returns:
        this assertion object.

      • inUnicode

        public SELF inUnicode()
        Use unicode character representation instead of standard representation in error messages.

        It can be useful when comparing UNICODE characters - many unicode chars have duplicate characters assigned, it is thus impossible to find differences from the standard error message:

        With standard message: 

         assertThat("µµµ").contains("μμμ");

 java.lang.AssertionError:
 Expecting:
   <"µµµ">
 to contain:
   <"μμμ">
        With Hexadecimal message: 
         assertThat("µµµ").inUnicode().contains("μμμ");

 java.lang.AssertionError:
 Expecting:
   <µµµ>
 to contain:
   <μμμ>
        Returns:
        this assertion object.

      • isEqualToIgnoringWhitespace

        public SELF isEqualToIgnoringWhitespace​(CharSequence expected)
        Verifies that the actual CharSequence is equal to the given one, ignoring whitespace differences

        Examples : 

         // assertions will pass
 assertThat("Game of Thrones").isEqualToIgnoringWhitespace("Game   of   Thrones")
                              .isEqualToIgnoringWhitespace("  Game of   Thrones  ")
                              .isEqualToIgnoringWhitespace("  Game of Thrones  ")
                              .isEqualToIgnoringWhitespace("Gameof      Thrones")
                              .isEqualToIgnoringWhitespace("Game of\tThrones")
                              .isEqualToIgnoringWhitespace("GameofThrones");

 // assertion will fail
 assertThat("Game of Thrones").isEqualToIgnoringWhitespace("Game OF Thrones");

        This assertion behavior has changed in 2.8.0 to really ignore all whitespaces, the old behaviour has been kept in the better named isEqualToNormalizingWhitespace(CharSequence).

        Parameters:
        expected - the given CharSequence to compare the actual CharSequence to.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not equal ignoring whitespace differences to the given one.

      • isNotEqualToIgnoringWhitespace

        public SELF isNotEqualToIgnoringWhitespace​(CharSequence expected)
        Verifies that the actual CharSequence is not equal to the given one, ignoring whitespace differences.

        Example : 

         // assertions will pass
 assertThat(" my\tfoo bar ").isNotEqualToIgnoringWhitespace("myfoo");
 assertThat(" my\tfoo").isNotEqualToIgnoringWhitespace(" my bar");

 // assertions will fail
 assertThat("my      foo bar").isNotEqualToIgnoringWhitespace("my foo bar");
 assertThat("  my foo bar  ").isNotEqualToIgnoringWhitespace("my foo bar");
 assertThat(" my     foo bar ").isNotEqualToIgnoringWhitespace("my foo bar");
 assertThat(" my\tfoo bar ").isNotEqualToIgnoringWhitespace(" my foo bar");
 assertThat("my foo bar").isNotEqualToIgnoringWhitespace("   my foo bar   ");
        Parameters:
        expected - the given CharSequence to compare the actual CharSequence to.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is equal ignoring whitespace differences to the given one.

      • isEqualToNormalizingWhitespace

        public SELF isEqualToNormalizingWhitespace​(CharSequence expected)
        Verifies that the actual CharSequence is equal to the given one, after the whitespace of both strings has been normalized.
        To be exact, the following rules are applied:
        • all leading and trailing whitespace of both actual and expected strings are ignored
        • any remaining whitespace, appearing within either string, is collapsed to a single space before comparison

        Example : 

         // assertions will pass
 assertThat("Game of Thrones").isEqualToNormalizingWhitespace("Game   of   Thrones")
                              .isEqualToNormalizingWhitespace("Game of     Thrones")
                              .isEqualToNormalizingWhitespace("Game     of Thrones")
                              .isEqualToNormalizingWhitespace("  Game of Thrones  ")
                              .isEqualToNormalizingWhitespace("  Game of   Thrones  ")
                              .isEqualToNormalizingWhitespace("Game of\tThrones")
                              .isEqualToNormalizingWhitespace("Game of Thrones");

 // assertions will fail
 assertThat("Game of Thrones").isEqualToNormalizingWhitespace("Game ofThrones");
 assertThat("Game of Thrones").isEqualToNormalizingWhitespace("Gameo fThrones");
 assertThat("Game of Thrones").isEqualToNormalizingWhitespace("Gameof Thrones");
        Parameters:
        expected - the given CharSequence to compare the actual CharSequence to.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not equal to the given one after whitespace has been normalized.
        Since:
        2.8.0 / 3.8.0

      • isNotEqualToNormalizingWhitespace

        public SELF isNotEqualToNormalizingWhitespace​(CharSequence expected)
        Verifies that the actual CharSequence is not equal to the given one, after the whitespace of both strings has been normalized.
        To be exact, the following rules are applied:
        • all leading and trailing whitespace of both actual and expected strings are ignored
        • any remaining whitespace, appearing within either string, is collapsed to a single space before comparison

        Example : 

         // assertions will pass
 assertThat(" my\tfoo").isNotEqualToNormalizingWhitespace(" my bar");
 assertThat(" my\tfoo bar ").isNotEqualToNormalizingWhitespace(" my foobar");

 // assertions will fail
 assertThat("my      foo bar").isNotEqualToNormalizingWhitespace("my foo bar");
 assertThat("  my foo bar  ").isNotEqualToNormalizingWhitespace("my foo bar");
 assertThat(" my     foo bar ").isNotEqualToNormalizingWhitespace("my foo bar");
 assertThat(" my\tfoo bar ").isNotEqualToNormalizingWhitespace(" my foo bar");
 assertThat("my foo bar").isNotEqualToNormalizingWhitespace("   my foo bar   ");
        Parameters:
        expected - the given CharSequence to compare the actual CharSequence to.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is equal to the given one after whitespace has been normalized.
        Since:
        2.8.0 / 3.8.0

      • isSubstringOf

        public SELF isSubstringOf​(CharSequence sequence)
        Verifies that the actual CharSequence is a substring of the given one (opposite assertion of contains(CharSequence cs).

        Example : 

         // assertions will pass
 assertThat("Lego").isSubstringOf("Legolas");
 assertThat("Legolas").isSubstringOf("Legolas");

 // assertion will fail
 assertThat("Frodo").isSubstringOf("Frod");
        Parameters:
        sequence - the sequence that is expected to contain actual.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not a substring of the given parameter.

      • containsPattern

        public SELF containsPattern​(CharSequence regex)
        Verifies that the actual CharSequence contains the given regular expression.

        Example : 

         // assertion will pass
 assertThat("Frodo").containsPattern("Fr.d");

 // assertion will fail
 assertThat("Frodo").containsPattern("Frodod");
        Parameters:
        regex - the regular expression to find in the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given pattern is null.
        PatternSyntaxException - if the regular expression's syntax is invalid.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the given regular expression cannot be found in the actual CharSequence.

      • containsPattern

        public SELF containsPattern​(Pattern pattern)
        Verifies that the actual CharSequence contains the given regular expression pattern.

        Example : 

         // assertion will pass
 assertThat("Frodo").containsPattern(Pattern.compile("Fr.d"));

 // assertion will fail
 assertThat("Frodo").containsPattern(Pattern.compile("Frodod"));
        Parameters:
        pattern - the regular expression to find in the actual CharSequence.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if the given pattern is null.
        AssertionError - if the actual CharSequence is null.
        AssertionError - if the given regular expression cannot be found in the actual CharSequence.

      • isEqualToNormalizingNewlines

        public SELF isEqualToNormalizingNewlines​(CharSequence expected)
        Verifies that the actual CharSequence is equals to another CharSequence after normalizing new line characters (i.e. '\r\n' == '\n').

        This assertion will succeed: 

         String bookName = "Lord of the Rings\r\n";
 assertThat(bookName).isEqualToNormalizingNewlines("Lord of the Rings\n");
        Whereas this assertion will fail: 
         String singleLine = "\n";
 assertThat(singleLine).isEqualToNormalizingNewlines("");
        Parameters:
        expected - the given CharSequence to compare the actual CharSequence to.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence and the given CharSequence are different after new lines are normalized.
        Since:
        2.7.0 / 3.7.0

      • isEqualToIgnoringNewLines

        public SELF isEqualToIgnoringNewLines​(CharSequence expected)
        Verifies that the actual CharSequence is equal to the given one after both strings new lines (\n, \r\n) have been removed.

        Example : 

         // assertions will pass
 assertThat("Some textWith new lines").isEqualToIgnoringNewLines("Some text\nWith new lines")
                                      .isEqualToIgnoringNewLines("Some text\r\nWith new lines")
                                      .isEqualToIgnoringNewLines("Some text\n\nWith new lines");

 assertThat("Some text\nWith new lines").isEqualToIgnoringNewLines("Some text\nWith new lines")
                                        .isEqualToIgnoringNewLines("Some text\r\nWith new lines")
                                        .isEqualToIgnoringNewLines("Some text\n\nWith new lines");

 // assertions will fail
 assertThat("Some text\nWith new lines").isEqualToIgnoringNewLines("Some text With new lines");
 assertThat("Some text\r\nWith new lines").isEqualToIgnoringNewLines("Some text With new lines");
        Parameters:
        expected - the given CharSequence to compare the actual CharSequence to.
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not equal to the given one after new lines have been removed.

      • isLowerCase

        public SELF isLowerCase()
        Verifies that the actual CharSequence is a lowercase CharSequence by comparing it to a lowercase actual built with String.toLowerCase().

        Example : 

         // assertions will pass
 assertThat("lego").isLowerCase();
 assertThat("").isLowerCase();
 assertThat(" ").isLowerCase();
 assertThat(".").isLowerCase();
 assertThat("7").isLowerCase();
 assertThat("a.7").isLowerCase();

 // assertions will fail
 assertThat("Lego").isLowerCase();
 assertThat("LEGO").isLowerCase();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not lowercase.

      • isUpperCase

        public SELF isUpperCase()
        Verifies that the actual CharSequence is a uppercase CharSequence by comparing it to an uppercase actual built with String.toUpperCase().

        Example : 

         // assertions will pass
 assertThat("LEGO").isUpperCase();
 assertThat("").isUpperCase();
 assertThat(" ").isUpperCase();
 assertThat(".").isUpperCase();
 assertThat("7").isUpperCase();
 assertThat("A.7").isUpperCase();

 // assertions will fail
 assertThat("Lego").isUpperCase();
 assertThat("lego").isUpperCase();
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual CharSequence is not uppercase.