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How to use VerboseCondition class of org.assertj.core.condition package

Best Assertj code snippet using org.assertj.core.condition.VerboseCondition

Source:VerboseCondition.java

...25 * When defining the {@code objectUnderTestDescriptor} function, you should take in consideration whether the condition is going to be used 26 * with {@link AbstractAssert#is(Condition) is(Condition)} or {@link AbstractAssert#has(Condition) has(Condition)} since the start of the error message is different between the two.  27 * <p>28 * Let's see how it works with an example that works well with {@link AbstractAssert#is(Condition) is(Condition)}:29 * <pre><code class='java'> Condition&lt;String&gt; shorterThan4 = VerboseCondition.verboseCondition(actual -&gt; actual.length() &lt; 4,30                                                                   // predicate description  31                                                                   "shorter than 4",32                                                                   // value under test description transformation function33                                                                   s -&gt; String.format(" but length was %s", s.length(), s));</code></pre>34 * 35 * If we execute:36 * <pre><code class='java'> assertThat("foooo").is(shorterThan4);</code></pre>37 * it fails with the following assertion error:38 * <pre><code class='text'> Expecting actual:39 *   "foooo"40 * to be shorter than 4 but length was 5</code></pre>41 * <p>42 * Note that the beginning of the error message looks nice with {@link AbstractAssert#is(Condition) is(Condition)}, but not so much with {@link AbstractAssert#has(Condition) has(Condition)}:43 * <pre><code class='text'> Expecting actual:44 *   "foooo"45 * to have shorter than 4 but length was 5</code></pre>46 * <p>47 * The {@code objectUnderTestDescriptor} must not be null, if you don't need one this probably means you can simply use {@link Condition#Condition(Predicate, String, Object...)} instead of a {@code VerboseCondition}.48 * 49 * @param <T> the type of object the given condition accept.50 *51 * @author Stefan Bischof52 */53@Beta54public final class VerboseCondition<T> extends Condition<T> {55  private Function<T, String> objectUnderTestDescriptor;56  // needed to avoid an incorrect description when matches is run multiple times.57  private String description;58  /**59   * Creates a new <code>{@link VerboseCondition}</code> to have better control over the condition description when the condition fails thanks 60   * to the {@code objectUnderTestDescriptor} function parameter.61   * <p>62   * When defining the {@code objectUnderTestDescriptor} function, you should take in consideration whether the condition is going to be used 63   * with {@link AbstractAssert#is(Condition) is(Condition)} or {@link AbstractAssert#has(Condition) has(Condition)} since the start of the error message is different between the two.  64   * <p>65   * Let's see how it works with an example that works well with {@link AbstractAssert#is(Condition) is(Condition)}:66   * <pre><code class='java'> Condition&lt;String&gt; shorterThan4 = VerboseCondition.verboseCondition(actual -&gt; actual.length() &lt; 4,67                                                                    // predicate description  68                                                                    "shorter than 4",69                                                                    // value under test description transformation function70                                                                    s -&gt; String.format(" but length was %s", s.length(), s));</code></pre>71   * 72   * If we execute:73   * <pre><code class='java'> assertThat("foooo").is(shorterThan4);</code></pre>74   * it fails with the following assertion error:75   * <pre><code class='text'> Expecting actual:76   *   "foooo"77   * to be shorter than 4 but length was 5</code></pre>78   * <p>79   * Note that the beginning of the error message looks nice with {@link AbstractAssert#is(Condition) is(Condition)}, but not so much with {@link AbstractAssert#has(Condition) has(Condition)}:80   * <pre><code class='text'> Expecting actual:81   *   "foooo"82   * to have shorter than 4 but length was 5</code></pre>83   * <p>84   * The {@code objectUnderTestDescriptor} must not be null, if you don't need one this probably means you can simply use {@link Condition#Condition(Predicate, String, Object...)} instead of a {@code VerboseCondition}.85   *86   * @param <T>                  the type of object the given condition accept.87   * @param predicate            the Predicate that tests the value to test.88   * @param description          describes the Condition verbal.89   * @param objectUnderTestDescriptor Function used to describe the value to test when the actual value does not match the predicate. must not be null.90   * @return the created {@code VerboseCondition}.91   * @throws NullPointerException if the predicate is {@code null}.92   * @throws NullPointerException if the objectUnderTestDescriptor is {@code null}.93   */94  public static <T> VerboseCondition<T> verboseCondition(Predicate<T> predicate, String description,95                                                         Function<T, String> objectUnderTestDescriptor) {96    return new VerboseCondition<>(predicate, description, objectUnderTestDescriptor);97  }98  private VerboseCondition(Predicate<T> predicate, String description, Function<T, String> objectUnderTestDescriptor) {99    super(predicate, description);100    this.description = description;101    this.objectUnderTestDescriptor = requireNonNull(objectUnderTestDescriptor,102                                                    "The objectUnderTest descriptor function must not be null, if you don't need one, consider using the basic Condition(Predicate<T> predicate, String description, Object... args) constructor");103  }104  @Override105  public boolean matches(T objectUnderTest) {106    boolean matches = super.matches(objectUnderTest);107    describedAs(buildVerboseDescription(objectUnderTest, matches));108    return matches;109  }110  /**111   * Build the verbose condition description when applied with the actual values and the match result.112   *...

Source:VerboseConditionTest.java

...14import static java.lang.String.format;15import static org.assertj.core.api.Assertions.assertThat;16import static org.assertj.core.api.Assertions.assertThatNullPointerException;17import static org.assertj.core.api.BDDAssertions.then;18import static org.assertj.core.condition.VerboseCondition.verboseCondition;19import static org.assertj.core.util.AssertionsUtil.expectAssertionError;20import org.assertj.core.api.Condition;21import org.junit.jupiter.api.Test;22class VerboseConditionTest {23  private static final Condition<String> VERBOSE_CONDITION = verboseCondition(actual -> actual.length() < 4,24                                                                              "shorter than 4",25                                                                              s -> format(" but length was %s", s.length(), s));26  @Test27  public void should_succeed_and_display_description_without_actual() {28    assertThat(VERBOSE_CONDITION.matches("foo")).isTrue();29    assertThat(VERBOSE_CONDITION).hasToString("shorter than 4");30  }31  @Test32  public void should_fail_and_display_actual_description_as_per_transformation_function_with_isCondition() {33    // WHEN34    AssertionError assertionError = expectAssertionError(() -> assertThat("foooo").is(VERBOSE_CONDITION));35    // THEN36    then(assertionError).hasMessage(format("%nExpecting actual:%n" +...

VerboseCondition

Using AI Code Generation

1import static org.assertj.core.api.Assertions.assertThat;2import static org.assertj.core.condition.VerboseCondition.verboseCondition;3import org.assertj.core.api.Condition;4import org.assertj.core.api.SoftAssertions;5import org.junit.Test;6public class VerboseConditionTest {7    public void testVerboseCondition() {8        SoftAssertions softly = new SoftAssertions();9        Condition<String> condition = new Condition<String>() {10            public boolean matches(String value) {11                return value.length() > 5;12            }13        };14        softly.assertThat("assertj").as("test1").is(verboseCondition(condition, "length should be greater than 5"));15        softly.assertThat("test").as("test2").is(verboseCondition(condition, "length should be greater than 5"));16        softly.assertAll();17    }18}

VerboseCondition

Using AI Code Generation

1import static org.assertj.core.api.Assertions.assertThat;2import org.assertj.core.api.Condition;3import org.assertj.core.condition.VerboseCondition;4public class VerboseConditionExample {5   public static void main(String[] args) {6      VerboseCondition<String> condition = new VerboseCondition<>(s -> s.contains("a"), "contains 'a'");7      assertThat("abc").is(condition);8   }9}

VerboseCondition

Using AI Code Generation

1package org.example;2import org.assertj.core.api.Condition;3import org.assertj.core.condition.VerboseCondition;4import java.util.Arrays;5import java.util.List;6import static java.util.Arrays;.assertThat7import jaass App {8    public static void main(String[] args) {9        List<Integer> numbers = Arrvya.asList(1, 2, 3, 4, 5);10        Condition<Integer> condition = new Condition<>(n -> n % 2 == 0, "even number");11        VerboseCondition<Integer> verbo.eConditionu= new til.List;<>(condition);12        assertThat(numbers).are(verboseCondition);13    }14}15package org.eample;16import org.assertj.core.api.Condition;17import org.assertj.core.condition.VerboseCondition;18import jva.util.Arrays;19iort java.uti.List;20import static org.assrtj.core.api.Assertions.assertThat;21import static org.assertj.core.api.Assertion22        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);23        Condition<Integer> condition = new Condition<>(n -> n % 2 == 0, "even number");24        VerboseCondition<Integer> verboseCondition = new VerboseCondition<>(condition);s.assertThat;25public cassertThat(numbers).areNot(verboselassition);26    }27}28  {[1, 2, 3, 4, 5]>29package org.example;30import org.assertj.core.api.Condition;31import org.assertj.core.condition.VerboseCondition;32import java.util.Arrays;33import java.util.List;34import static org.assertj.core.api.Assertions.assertThat;35public class App {36    public static void main(ring[] ags) {37        Lst<Iteer numbers = Arrays.asList(1, 2, 3, 4, 5);

VerboseCondition

Using AI Code Generation

1package org.example;2import org.assertj.core.api.Condition;3import org.assertj.core.condition.VerboseCondition;4import org.assertj.core.api.Assertions;5public class VerboseConditionExample {6    public static void main(String[] args) {7    public static void main(String[] args) {8        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);9        Condition<Integer> condition = new Condition<>(n -> n % 2 == 0, "even number");10        VerboseCondition<Integer> verboseCondition = new VerboseCondition<>(condition);11        assertThat(numbers).are(verboseCondition);12    }13}

VerboseCondition

Using AI Code Generation

1import static org.assertj.core.api.Assertions.assertThat;2import static org.assertj.core.condition.VerboseCondition.verboseCondition;3import org.junit.Test;4public class VerboseConditionTest {5   public void test() {6      assertThat("test").is(verbseCo( -> s.length() == 4, "length is 4"));7   }but some elements were not matching:8}9package org.example;10import org.assertj.core.api.Condition;11import org.assertj.core.condition.VerboseCondition;12import java.util.Arrays;13import java.util.List;14import static org.assertj.core.api.Assertions.assertThat;15public class App {16    public static void main(String[] args) {17        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);18        Condition<Integer> condition = new Condition<>(n -> n % 2 == 0, "even number");19        VerboseCondition<Integer> verboseCondition = new VerboseCondition<>(condition);20        assertThat(numbers).areNot(verboseCondition);21    }22}23package org.example;24import org.assertj.core.api.Condition;25import org.assertj.core.condition.VerboseCondition;26import java.util.Arrays;27import java.util.List;28import static org.assertj.core.api.Assertions.assertThat;29public class App {30    public static void main(String[] args) {31        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);

VerboseCondition

Using AI Code Generation

1package org.example;2import org.assertj.core.api.Condition;3import org.assertj.core.condition.VerboseCondition;4import org.assertj.core.api.Assertions;5public class VerboseConditionExample {6    public static void main(String[] args) {7        Condition<String> condition = new Condition<String>(s -> s.startsWith("A"), "starts with A");8        Condition<String> verboseCondition = VerboseCondition.verboseCondition(condition, "The value '%s' does not start with 'A'");9        Assertions.assertThat("B").is(verboseCondition);10    }11}

VerboseCondition

Using AI Code Generation

1import static org.assertj.core.api.Assertions.assertThat;2import static org.assertj.core.condition.VerboseCondition.verboseCondition;3import org.junit.Test;4public class VerboseConditionTest {5   public void test() {6      assertThat("test").is(verboseCondition(s -> s.length() == 4, "length is 4"));7   }8}

VerboseCondition

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.assertj.core.condition.VerboseCondition;3import org.junit.Test;4public class VerboseConditionTest {5    public void test() {6        Assertions.assertThat(10).is(new VerboseCondition<>(i -> i % 2 == 0, "is even"));7    }8}

VerboseCondition

Using AI Code Generation

1import org.assertj.core.condition.VerboseCondition;2import static org.assertj.core.api.Assertions.assertThat;3public class VerboseConditionExample {4   public static void main(String[] args) {5      VerboseCondition<Integer> isOdd = new VerboseCondition<>(n -> n % 2 != 0, "%d is not an even number");6      assertThat(5).is(isOdd);7   }8}9import orgassert.core.condition.VerboseCondition;10import static org.assertj.core.api.Assertions.assertThat;11public clss VerboseConditionExample {12   public static oid min(String[] args) {13      VerboseCondition<Integer> isOdd = new VerboseCondition<>(n -> n % 2 != 0, "%d is not an even number");14      assertThat(4).is(isOdd);15   }16}17import org.assertj.core.condition.VerboseCondition;18import static org.assertj.core.api.Assertions.assertThat;19public class VerboseConditionExample {20   public static void main(String[] args) {21      VerboseCondition<Integer> isOdd = new VerboseCondition<>(n -> n % 2 != 0, "%d is not an even number");22      assertThat(5).isNot(isOdd);23   }24}25import org.assertj.core.condition.VerboseCondition;26import static org.assertj.core.api.Assertions.assertThat;27    public void test1()28    {29        Assertions.assertThat("Hello").is(VerboseCondition.verboseCondition("Hello", "Hello"));30    }31}32org.example.AppTest > test1() FAILED33     <VerboseCondition{verbose description="Hello"}>34        at org.example.AppTest.test1(AppTest.java:11)35package org.example;36import org.assertj.core.api.Assertions;37import org.assertj.core.api.Condition;38import org.junit.Test;39{40    public void test1()41    {42        Assertions.assertThat("Hello").is(new Condition<String>("Hello")43        {44            public boolean matches(String value)45            {46                return value.equals("Hello");47            }48        });49    }50}51org.example.AppTest > test1() FAILED52     <Condition{description='Hello'}>53        at org.example.AppTest.test1(AppTest.java:11)54package org.example;55import org.assertj.core.api.Assertions;56import org.assertj.core.api.Condition;57import org.junit.Test;58{59    public void test1()60    {61        Assertions.assertThat("Hello").is(new Condition<String>("Hello")62        {63            public boolean matches(String value)64            {65                return value.equals("Hello");66            }67        });68    }69}70org.example.AppTest > test1() FAILED71     <Condition{description='Hello'}>72        at org.example.AppTest.test1(AppTest.java:11)

VerboseCondition

Using AI Code Generation

1package org.example;2import org.assertj.core.api.Assertions;3import org.assertj.core.api.Condition;4public class VerboseConditionExample {5    public static void main(String[] args) {6        Condition<String> condition = new Condition<>(s -> s.contains("a"), "contains 'a'");7        Assertions.assertThat("abc").is(condition);8    }9}10Asserting a condition: assertTrue(), assertFalse()11Asserting equality: assertEquals(), assertNotEquals()12Asserting nullity: assertNull(), assertNotNull()13Asserting emptyness: assertArrayEquals(), assertArrayEquals(), assertArrayEquals()

VerboseCondition

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.assertj.core.condition.VerboseCondition;3import org.junit.jupiter.api.Test;4public class VerboseConditionTest {5public void verboseConditionTest() {6    VerboseCondition<Integer> isEven = new VerboseCondition<>(i -> i % 2 == 0, "%d is not even");7    Assertions.assertThat(2).is(isEven);8    Assertions.assertThat(3).is(isEven);9}10}11The VerboseCondition class also has a static method called verboseCondition() that returns a VerboseCondition object. The verboseCondition() method takes a Predicate object and a String object as parameters. The first parameter is a Predicate object that defines the condition to check. The second parameter is a String object that defines the error message to print when the condition is not satisfied. The verboseCondition() method can be used as follows:12Assertions.assertThat(2).is(VerboseCondition.verboseCondition(i -> i % 2 == 0, "%d is not even"));13Assertions.assertThat(3).is(VerboseCondition.verboseCondition(i -> i % 2 == 0, "%d is not even"));

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