How to use matches method of org.assertj.core.condition.VerboseCondition class

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

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...52 */​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 *113 * @param objectUnderTest the object to test114 * @param matches the result of the match operation115 * @return the verbose condition description.116 */​117 protected String buildVerboseDescription(T objectUnderTest, boolean matches) {118 StringBuilder sb = new StringBuilder(format("%s", description));119 if (!matches) sb.append(objectUnderTestDescriptor.apply(objectUnderTest));120 return sb.toString();121 }122}...

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...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" +37 " \"foooo\"%n" +38 "to be shorter than 4 but length was 5"));39 }40 @Test41 public void should_fail_and_display_actual_description_as_per_transformation_function_with_hasCondition() {42 /​/​ GIVEN43 Condition<String> shortLength = verboseCondition(actual -> actual.length() < 4,44 "length shorter than 4",45 s -> format(" but length was %s", s.length(), s));46 /​/​ WHEN47 AssertionError assertionError = expectAssertionError(() -> assertThat("foooo").has(shortLength));48 /​/​ THEN49 then(assertionError).hasMessage(format("%nExpecting actual:%n" +50 " \"foooo\"%n" +51 "to have length shorter than 4 but length was 5"));52 }53 @Test54 public void multiple_matches_should_not_change_description() {55 VERBOSE_CONDITION.matches("foooo");56 assertThat(VERBOSE_CONDITION).hasToString("shorter than 4 but length was 5");57 VERBOSE_CONDITION.matches("foooo");58 VERBOSE_CONDITION.matches("foooo");59 assertThat(VERBOSE_CONDITION).hasToString("shorter than 4 but length was 5");60 }61 @Test62 public void should_throw_NullPointerException_if_condition_predicate_is_null() {63 assertThatNullPointerException().isThrownBy(() -> verboseCondition(null, "description", t -> ""));64 }65 @Test66 public void should_throw_NullPointerException_if_objectUnderTestDescriptor_parameter_is_null() {67 assertThatNullPointerException().isThrownBy(() -> verboseCondition(s -> s != null, "shorter than 4", null));68 }69}...

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1import org.assertj.core.api.Assertions;2import org.assertj.core.condition.VerboseCondition;3import org.junit.Test;4public class VerboseConditionTest {5 public void testVerboseCondition() {6 Assertions.assertThat("test").matches(VerboseCondition.verboseCondition(7 s -> s.equals("test"), "this is a test"));8 }9}10at org.junit.Assert.assertEquals(Assert.java:115)11at org.junit.Assert.assertEquals(Assert.java:144)12at org.assertj.core.api.AbstractAssert.isEqualTo(AbstractAssert.java:69)13at org.assertj.core.api.AbstractStringAssert.isEqualTo(AbstractStringAssert.java:174)14at org.assertj.core.api.StringAssert.isEqualTo(StringAssert.java:75)15at org.assertj.core.api.AbstractStringAssert.isEqualTo(AbstractStringAssert.java:180)16at org.assertj.core.api.Assertions_assertThat_with_String_Test.test_verbose_condition(Assertions_assertThat_with_String_Test.java:41)

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1import org.assertj.core.api.Assertions;2import org.assertj.core.condition.VerboseCondition;3public class 1 {4 public static void main(String[] args) {5 Assertions.assertThat("Hello World").matches(VerboseCondition.verboseCondition(String::isEmpty, "is empty"));6 Assertions.assertThat("Hello World").matches(VerboseCondition.verboseCondition(s -> s.length() > 0, "is not empty"));7 }8}

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1package org.assertj.core.condition;2import org.assertj.core.api.Condition;3public class VerboseCondition {4 public static void main(String[] args) {5 Condition<String> condition = new Condition<String>() {6 public boolean matches(String value) {7 return value.contains("test");8 }9 };10 VerboseCondition<String> verboseCondition = new VerboseCondition<>(condition, "should contain test");11 boolean result = verboseCondition.matches("testing");12 System.out.println("Result: " + result);13 }14}

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1public class VerboseConditionMatchesMethod {2 public static void main(String[] args) {3 VerboseCondition<String> vc = new VerboseCondition<>(s -> s.contains("a"), "contains 'a'");4 System.out.println(vc.matches("abc"));5 }6}7import static org.assertj.core.api.Assertions.assertThat;8import static org.assertj.core.condition.VerboseCondition.verboseCondition;9public class VerboseConditionMatchesMethod2 {10 public static void main(String[] args) {11 VerboseCondition<String> vc = verboseCondition(s -> s.contains("a"), "contains 'a'");12 System.out.println(vc.matches("abc"));13 assertThat(vc.matches("abc")).isTrue();14 }15}

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1package org.jfree.chart.util.junit;2import org.assertj.core.api.Condition;3import org.junit.Test;4import static org.assertj.core.api.Assertions.assertThat;5import static org.assertj.core.condition.VerboseCondition.verboseCondition;6public class AssertJTest {7 public void testAssertJ() {8 assertThat("foo").matches(verboseCondition(new Condition<String>() {9 public boolean matches(String value) {10 return value.contains("foo");11 }12 }, "contains foo"));13 }14}15package org.jfree.chart.util.junit;16import org.junit.Test;17import static org.assertj.core.api.Assertions.assertThat;18import static org.assertj.core.condition.VerboseCondition.verboseCondition;19public class AssertJTest {20 public void testAssertJ() {21 assertThat("foo").matches(verboseCondition(value -> value.contains("foo"), "contains foo"));22 }23}24package org.jfree.chart.util.junit;25import org.junit.Test;26import static org.assertj.core.api.Assertions.assertThat;27import static org.assertj.core.condition.VerboseCondition.verboseCondition;28public class AssertJTest {29 public void testAssertJ() {30 assertThat("foo").matches(verboseCondition(value -> value.contains("foo"), "contains foo"));31 }32}33package org.jfree.chart.util.junit;34import org.junit.Test;35import static org.assertj.core.api.Assertions.assertThat;36import static org.assertj.core.condition.VerboseCondition.verboseCondition;37public class AssertJTest {38 public void testAssertJ() {39 assertThat("foo").matches(verboseCondition(value -> value.contains("foo"), "contains foo"));40 }41}42package org.jfree.chart.util.junit;43import org.junit.Test;44import static org.assertj.core.api.Assertions.assertThat;45import static org.assertj.core.condition.VerboseCondition.verboseCondition;46public class AssertJTest {47 public void testAssertJ() {48 assertThat("foo").matches(verboseCondition(value -> value.contains("foo"), "contains foo"));49 }50}

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1public class VerboseConditionExample {2 public static void main(String[] args) {3 VerboseCondition<String> vc = new VerboseCondition<>(s -> s.startsWith("A"), "String starts with 'A'");4 assertThat("Abc").matches(vc);5 }6}

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1public class AssertjConditionMatches {2 public static void main(String[] args) {3 String str = "abc";4 Condition<String> condition = new Condition<>(s -> s.length() == 3, "length is 3");5 assertThat(str).matches(condition);6 }7}8public class AssertjConditionMatches {9 public static void main(String[] args) {10 String str = "abc";11 Condition<String> condition = new Condition<>(s -> s.length() == 3, "length is 3");12 assertThat(str).matches(condition);13 }14}15public class AssertjConditionMatches {16 public static void main(String[] args) {17 String str = "abc";18 Condition<String> condition = new Condition<>(s -> s.length() == 3, "length is 3");19 assertThat(str).matches(condition);20 }21}22public class AssertjConditionMatches {23 public static void main(String[] args) {24 String str = "abc";25 Condition<String> condition = new Condition<>(s -> s.length() == 3, "length is 3");26 assertThat(str).matches(condition);27 }28}29public class AssertjConditionMatches {30 public static void main(String[] args) {

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1package org.jfree.chart.util.junit;2import org.assertj.core.api.Condition;3import org.junit.Test;4import static org.assertj.core.api.Assertions.assertThat;5import static org.assertj.core.condition.VerboseCondition.verboseCondition;6public class AssertJTest {7 public void testAssertJ() {8 assertThat("foo").matches(verboseCondition(new Condition<String>() {9 public boolean matches(String value) {10 return value.contains("foo");11 }12 }, "contains foo"));13 }14}15package org.jfree.chart.util.junit;16import org.junit.Test;17import static org.assertj.core.api.Assertions.assertThat;18import static org.assertj.core.condition.VerboseCondition.verboseCondition;19public class AssertJTest {20 public void testAssertJ() {21 assertThat("foo").matches(verboseCondition(value -> value.contains("foo"), "contains foo"));22 }23}24package org.jfree.chart.util.junit;25import org.junit.Test;26import static org.assertj.core.api.Assertions.assertThat;27import static org.assertj.core.condition.VerboseCondition.verboseCondition;28public class AssertJTest {29 public void testAssertJ() {30 assertThat("foo").matches(verboseCondition(value -> value.contains("foo"), "contains foo"));31 }32}33package org.jfree.chart.util.junit;34import org.junit.Test;35import static org.assertj.core.api.Assertions.assertThat;36import static org.assertj.core.condition.VerboseCondition.verboseCondition;37public class AssertJTest {38 public void testAssertJ() {39 assertThat("foo").matches(verboseCondition(value -> value.contains("foo"), "contains foo"));40 }41}42package org.jfree.chart.util.junit;43import org.junit.Test;44import static org.assertj.core.api.Assertions.assertThat;45import static org.assertj.core.condition.VerboseCondition.verboseCondition;46public class AssertJTest {47 public void testAssertJ() {48 assertThat("foo").matches(verboseCondition(value -> value.contains("foo"), "contains foo"));49 }50}

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1public class VerboseConditionExample {2 public static void main(String[] args) {3 VerboseCondition<String> vc = new VerboseCondition<>(s -> s.startsWith("A"), "String starts with 'A'");4 assertThat("Abc").matches(vc);5 }6}

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1package org.assertj.core.condition;2import org.assertj.core.api.Condition;3public class VerboseCondition<T> extends Condition<T> {4 public VerboseCondition(Condition<T> condition) {5 super(condition.descriptionText, condition.representation);6 }7 public boolean matches(T value) {8 return true;9 }10 public static void main(String[] args) {11 Condition<String> condition = new Condition<String>("my condition") {12 public boolean matches(String value) {13 return value.length() > 10;14 }15 };16 VerboseCondition<String> verboseCondition = new VerboseCondition<String>(condition);17 System.out.println("Does the condition match the value? " + verboseCondition.matches("Hello World!"));18 }19}

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1package org.bitbucket.example;2import org.assertj.core.api.Condition;3import org.assertj.core.condition.VerboseCondition;4public class Example1 {5 public static void main(String[] args) {6 Condition<String> condition = new Condition<String>() {7 public boolean matches(String s) {8 return s.length() > 5;9 }10 };11 String string = "example";12 System.out.println(VerboseCondition.matches(condition, string));13 }14}15package org.bitbucket.example;16import org.assertj.core.api.Condition;17import org.assertj.core.condition.VerboseCondition;18public class Example2 {19 public static void main(String[] args) {20 Condition<String> condition = new Condition<String>() {21 public boolean matches(String s) {22 return s.length() > 5;23 }24 };25 String string = "example";26 System.out.println(VerboseCondition.matches(condition, string, "string"));27 }28}29package org.bitbucket.example;30import org.assertj.core.api.Condition;31import org.assertj.core.condition.VerboseCondition;32public class Example3 {33 public static void main(String[] args) {34 Condition<String> condition = new Condition<String>() {35 public boolean matches(String s) {36 return s.length() > 5;37 }38 };39 String string = "example";40 System.out.println(VerboseCondition.matches(condition, string, "string", "length"));41 }42}43package org.bitbucket.example;44import org.assertj.core.api.Condition;45import org.assertj.core.condition.VerboseCondition;46public class Example4 {47 public static void main(String[] args) {48 Condition<String> condition = new Condition<String>() {49 public boolean matches(String s) {50 return s.length() > 5;

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