Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Register for FREE! Join TestMu Conference

How to use describeTo method of org.assertj.core.matcher.AssertionMatcher class

Best Assertj code snippet using org.assertj.core.matcher.AssertionMatcher.describeTo

Source:AssertionMatcher_matches_Test.java

...34    @Test35    public void matcher_should_not_fill_description_when_assertion_passes() {36        Description description = Mockito.mock(Description.class);37        Assertions.assertThat(isZeroMatcher.matches(AssertionMatcher_matches_Test.ZERO)).isTrue();38        isZeroMatcher.describeTo(description);39        Mockito.verifyZeroInteractions(description);40    }41    @Test42    public void matcher_should_fail_when_assertion_fails() {43        Assertions.assertThat(isZeroMatcher.matches(AssertionMatcher_matches_Test.ONE)).isFalse();44    }45    /**46     * {@link Failures#removeAssertJRelatedElementsFromStackTrace} must be set to true47     * in order for this test to pass. It is in {@link this#setUp()}.48     */49    @Test50    public void matcher_should_fill_description_when_assertion_fails() {51        Description description = Mockito.mock(Description.class);52        Assertions.assertThat(isZeroMatcher.matches(AssertionMatcher_matches_Test.ONE)).isFalse();53        isZeroMatcher.describeTo(description);54        Mockito.verify(description).appendText("AssertionError with message: ");55        Mockito.verify(description).appendText(String.format("%nExpecting:%n <1>%nto be equal to:%n <0>%nbut was not."));56        Mockito.verify(description).appendText(String.format("%n%nStacktrace was: "));57        // @format:off58        Mockito.verify(description).appendText(ArgumentMatchers.argThat(new ArgumentMatcher<String>() {59            @Override60            public boolean matches(String s) {61                return (((s.contains(String.format("%nExpecting:%n <1>%nto be equal to:%n <0>%nbut was not."))) && (s.contains("at org.assertj.core.matcher.AssertionMatcher_matches_Test$1.assertion(AssertionMatcher_matches_Test.java:"))) && (s.contains("at org.assertj.core.matcher.AssertionMatcher.matches(AssertionMatcher.java:"))) && (s.contains("at org.assertj.core.matcher.AssertionMatcher_matches_Test.matcher_should_fill_description_when_assertion_fails(AssertionMatcher_matches_Test.java:"));62            }63        }));64        // @format:on65    }66}...

Source:AssertionMatcher.java

...18/**19 * Generic Hamcrest {@link Matcher} that reuses AssertJ assertions.20 * <p>21 * Overriding classes should only implement {@link AssertionMatcher#assertion(Object)} method as  22 * {@link Matcher#matches(Object)} and {@link Matcher#describeTo(Description)} are provided. 23 * <p>24 * If the matcher fails, the description will contain the stacktrace of the first failed assertion.25 * <p>26 * Example with Mockito:27 * <pre><code class='java'> verify(customerRepository).save(argThat(new AssertionMatcher&lt;Customer&gt;() {28 *     &#64;Override29 *     public void assertion(Customer actual) throws AssertionError {30 *       assertThat(actual).hasName(&quot;John&quot;)31 *                         .hasAge(30);32 *     }33 *   })34 * );</code></pre>35 * 36 * @param <T> the type of the object to test37 *38 * @author Tomasz KalkosiÅski39 * @since 2.7.0 / 3.7.040 */41public abstract class AssertionMatcher<T> extends BaseMatcher<T> {42  private AssertionError firstError;43  /**44   * {@inheritDoc}45   */46  @SuppressWarnings("unchecked")47  @Override48  public boolean matches(Object argument) {49    T actual = (T) argument;50    try {51      assertion(actual);52      return true;53    } catch (AssertionError e) {54      firstError = e;55      return false;56    }57  }58  /**59   * Perform the assertions implemented in this method when the {@link AssertionMatcher} is used as an Hamcrest {@link Matcher}.60   *61   * If the matcher fails, the description will contain the stacktrace of the first failed assertion.62   * <p>63   * Example with Mockito:64   * <pre><code class='java'> verify(customerRepository).save(argThat(new AssertionMatcher&lt;Customer&gt;() {65   *     &#64;Override66   *     public void assertion(Customer actual) throws AssertionError {67   *       assertThat(actual).hasName(&quot;John&quot;)68   *                         .hasAge(30);69   *     }70   *   })71   * );</code></pre>72   *73   * @param actual assertion object74   * @throws AssertionError if the assertion object fails assertion75   */76  public abstract void assertion(T actual) throws AssertionError;77  /**78   * {@inheritDoc}79   */80  @Override81  public void describeTo(Description description) {82    if (firstError != null) {83      description.appendText("AssertionError with message: ");84      description.appendText(firstError.getMessage());85      description.appendText(String.format("%n%nStacktrace was: "));86      description.appendText(Throwables.getStackTrace(firstError));87    }88  }89}...

describeTo

Using AI Code Generation

1import org.assertj.core.matcher.AssertionMatcher;2import org.junit.Test;3import java.util.ArrayList;4import java.util.Collection;5import java.util.List;6import static org.assertj.core.api.Assertions.assertThat;7import static org.assertj.core.api.Assertions.assertThatExceptionOfType;8import static org.assertj.core.api.Assertions.assertThatThrownBy;9public class AssertJTest {10    public void testAssertJ(){11        List<String> list = new ArrayList<>();12        list.add("one");13        list.add("two");14        list.add("three");15        assertThat(list).hasSize(3)16                .contains("one", "two")17                .doesNotContain("four")18                .allMatch(s -> s.length() > 2)19                .noneMatch(s -> s.length() > 4);20        assertThatExceptionOfType(RuntimeException.class)21                .isThrownBy(() -> { throw new RuntimeException("boom!"); })22                .withMessage("boom!")23                .withNoCause();24        assertThatThrownBy(() -> { throw new RuntimeException("boom!"); })25                .isInstanceOf(RuntimeException.class)26                .hasMessage("boom!")27                .hasNoCause();28        assertThat(list).extracting(String::length).contains(3, 4, 5);29        assertThat(list).extracting("length").contains(3, 4, 5);30        assertThat(list).extracting("length", Integer.class).contains(3, 4, 5);31        assertThat(list).filteredOn(s -> s.length() > 3).contains("three");32        assertThat(list).filteredOn("length", 5).contains("three");33        assertThat(list).filteredOn("length", in(3, 5)).contains("one", "three");34        assertThat(list).flatExtracting(String::chars).contains(1, 2, 3);35        assertThat(list).flatExtracting("chars").contains(1, 2, 3);36        assertThat(list).flatExtracting("chars", Integer.class).contains(1, 2, 3);37    }38    private static AssertionMatcher<Integer> in(final int... values) {39        return new AssertionMatcher<Integer>() {40            public void assertion(Integer actual) {41                assertThat(values).contains(actual);42            }43        };44    }45}

describeTo

Using AI Code Generation

1import org.assertj.core.matcher.AssertionMatcher;2import org.hamcrest.Description;3import org.hamcrest.Matcher;4import org.junit.Test;5import static org.hamcrest.MatcherAssert.assertThat;6import static org.hamcrest.Matchers.is;7import static org.hamcrest.Matchers.not;8import static org.hamcrest.Matchers.startsWith;9public class AssertionMatcherTest {10    public void testAssertionMatcher() {11        AssertionMatcher<Integer> assertionMatcher = new AssertionMatcher<Integer>() {12            public void assertion(Integer actual) {13                assertThat(actual, startsWith(1));14            }15        };16        assertThat(12, assertionMatcher);17        assertThat(2, not(assertionMatcher));18    }19}20import org.hamcrest.BaseMatcher;21import org.hamcrest.Description;22import org.hamcrest.Matcher;23import org.junit.Test;24import static org.hamcrest.MatcherAssert.assertThat;25import static org.hamcrest.Matchers.is;26import static org.hamcrest.Matchers.not;27import static org.hamcrest.Matchers.startsWith;28public class BaseMatcherTest {29    public void testBaseMatcher() {30        BaseMatcher<Integer> baseMatcher = new BaseMatcher<Integer>() {31            public void describeTo(Description description) {32                description.appendText("starts with 1");33            }34            public boolean matches(Object item) {35                return item.toString().startsWith("1");36            }37        };38        assertThat(12, is(baseMatcher));39        assertThat(2, is(not(baseMatcher)));40    }41}42import org.hamcrest.Description;43import org.hamcrest.TypeSafeMatcher;44import org.junit.Test;45import static org.hamcrest.MatcherAssert.assertThat;46import static org.hamcrest.Matchers.is;47import static org.hamcrest.Matchers.not;48import static org.hamcrest.Matchers.startsWith;49public class TypeSafeMatcherTest {50    public void testTypeSafeMatcher() {51        TypeSafeMatcher<Integer> typeSafeMatcher = new TypeSafeMatcher<Integer>() {52            public void describeTo(Description description) {53                description.appendText("starts with 1");54            }55            protected boolean matchesSafely(Integer item) {56                return item.toString().startsWith("1");57            }58        };59        assertThat(12, is(typeSafeMatcher));60        assertThat(2, is(not(typeSafeMatcher)));61    }62}63import org.hamcrest.SelfDes

describeTo

Using AI Code Generation

1import org.junit.Test;2import org.junit.runner.RunWith;3import org.mockito.junit.MockitoJUnitRunner;4import org.assertj.core.matcher.AssertionMatcher;5import static org.assertj.core.api.Assertions.assertThat;6import static org.mockito.Mockito.mock;7public class 1 {8    public void test() {9        AssertionMatcher<Object> assertionMatcher = new AssertionMatcher<Object>() {10            public void assertion(Object o) {11                assertThat(o).isEqualTo("test");12            }13        };14        assertThat(assertionMatcher).describedAs("test").matches("test");15    }16}17	at org.junit.Assert.assertEquals(Assert.java:115)18	at org.junit.Assert.assertEquals(Assert.java:144)19	at org.assertj.core.matcher.AssertionMatcher.matches(AssertionMatcher.java:34)20	at org.assertj.core.matcher.AssertionMatcher.matches(AssertionMatcher.java:1)21	at org.assertj.core.api.AbstractAssert.matches(AbstractAssert.java:87)22	at 1.test(1.java:20)23AssertionMatcher.matches() method is called from Abstract

describeTo

Using AI Code Generation

1package org.junit;2import org.junit.runner.RunWith;3import org.junit.runners.Parameterized;4import org.junit.runners.Parameterized.Parameters;5import org.junit.runners.Parameterized.Parameter;6import static org.assertj.core.api.Assertions.assertThat;7import static org.assertj.core.api.Assertions.assertThatExceptionOfType;8import static org.assertj.core.api.Assertions.catchThrowable;9import static org.assertj.core.api.Assertions.fail;10import static org.assertj.core.api.Assertions.failBecauseExceptionWasNotThrown;11import static org.assertj.core.api.Assertions.failBecauseExceptionWasNotThrown;12import stati

describeTo

Using AI Code Generation

1import org.assertj.core.matcher.AssertionMatcher;2import org.junit.Test;3import static org.assertj.core.api.Assertions.assertThat;4public class AssertionMatcherTest {5    public void testAssertionMatcher() {6        assertThat("Java", new AssertionMatcher<String>() {7            public void assertion(String s) throws AssertionError {8                assertThat(s).startsWith("J").endsWith("a");9            }10        });11    }12}

describeTo

Using AI Code Generation

1import org.assertj.core.matcher.AssertionMatcher;2import org.junit.Test;3import static org.assertj.core.api.Assertions.assertThat;4public class AssertJTest {5    public void testAssertJ() {6        assertThat("Hello World").matches(new AssertionMatcher<String>() {7            public void assertion(String s) {8                assertThat(s).isEqualToIgnoringCase("Hello World");9            }10        });11    }12}13import org.assertj.core.matcher.AssertionMatcher;14import org.junit.Test;15import static org.assertj.core.api.Assertions.assertThat;16public class AssertJTest {17    public void testAssertJ() {18        assertThat("Hello World").matches(new AssertionMatcher<String>() {19            public void assertion(String s) {20                assertThat(s).isEqualToIgnoringCase("Hello World");21            }22        });23    }24}25import org.assertj.core.matcher.AssertionMatcher;26import org.junit.Test;27import static org.assertj.core.api.Assertions.assertThat;28public class AssertJTest {29    public void testAssertJ() {30        assertThat("Hello World").matches(new AssertionMatcher<String>() {31            public void assertion(String s) {32                assertThat(s).isEqualToIgnoringCase("Hello World");33            }34        });35    }36}

describeTo

Using AI Code Generation

1import static org.assertj.core.api.Assertions.assertThat;2import static org.assertj.core.matcher.AssertionMatcher.*;3import static org.mockito.Mockito.*;4import java.util.*;5import org.junit.Test;6import org.mockito.Mockito;7import org.mockito.Mockito.*;

describeTo

Using AI Code Generation

1import java.util.*;2import static org.assertj.core.api.Assertions.assertThat;3import static org.assertj.core.matcher.AssertionMatcher.*;4import static org.assertj.core.api.Assertions.*;5import org.assertj.core.matcher.AssertionMatcher;6public class AssertionMatcherExample {7   public static void main(String[] args) {8      List<String> list = new ArrayList<>();9      list.add("hello");10      list.add("world");11      assertThat(list, hasSize(2));12      assertThat(list, contains("hello", "world"));13      assertThat(list, contains(assertion(s -> s.length() > 3, "length > 3")));14      assertThat(list, contains(assertion(s -> s.length() > 10, "length > 10")));15   }16}

describeTo

Using AI Code Generation

1import org.junit.*;2import org.junit.runner.*;3import org.junit.runners.*;4import static org.assertj.core.api.Assertions.*;5@RunWith(JUnit4.class)6public class Test1 {7   public void test1() {8      AssertionMatcher<String> assertionMatcher = new AssertionMatcher<String>() {9         public void assertion(String s) {10            assertThat(s).isEqualTo("Hello World");11         }12      };13      assertThat("Hello World").matches(assertionMatcher);14   }15}16OK (1 test)

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.