How to use assertValueIsPresent method of org.assertj.core.api.AbstractOptionalAssert class

Best Assertj code snippet using org.assertj.core.api.AbstractOptionalAssert.assertValueIsPresent

Source:AbstractOptionalAssert.java Github

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...55 *56 * @return this assertion object.57 */58 public SELF isPresent() {59 assertValueIsPresent();60 return myself;61 }62 /**63 * Verifies that there is a value present in the actual {@link java.util.Optional}, it's an alias of {@link #isPresent()}.64 * <p>65 * Assertion will pass :66 * <pre><code class='java'> assertThat(Optional.of("something")).isNotEmpty();</code></pre>67 *68 * Assertion will fail :69 * <pre><code class='java'> assertThat(Optional.empty()).isNotEmpty();</code></pre>70 *71 * @return this assertion object.72 */73 public SELF isNotEmpty() {74 return isPresent();75 }76 /**77 * Verifies that the actual {@link java.util.Optional} is empty.78 * <p>79 * Assertion will pass :80 * <pre><code class='java'> assertThat(Optional.empty()).isEmpty();</code></pre>81 *82 * Assertion will fail :83 * <pre><code class='java'> assertThat(Optional.of("something")).isEmpty();</code></pre>84 *85 * @return this assertion object.86 */87 public SELF isEmpty() {88 isNotNull();89 if (actual.isPresent()) throwAssertionError(shouldBeEmpty(actual));90 return myself;91 }92 /**93 * Verifies that the actual {@link java.util.Optional} is empty (alias of {@link #isEmpty()}).94 * <p>95 * Assertion will pass :96 * <pre><code class='java'> assertThat(Optional.empty()).isNotPresent();</code></pre>97 *98 * Assertion will fail :99 * <pre><code class='java'> assertThat(Optional.of("something")).isNotPresent();</code></pre>100 *101 * @return this assertion object.102 */103 public SELF isNotPresent() {104 return isEmpty();105 }106 /**107 * Verifies that the actual {@link java.util.Optional} contains the given value (alias of {@link #hasValue(Object)}).108 * <p>109 * Assertion will pass :110 * <pre><code class='java'> assertThat(Optional.of("something")).contains("something");111 * assertThat(Optional.of(10)).contains(10);</code></pre>112 *113 * Assertion will fail :114 * <pre><code class='java'> assertThat(Optional.of("something")).contains("something else");115 * assertThat(Optional.of(20)).contains(10);</code></pre>116 *117 * @param expectedValue the expected value inside the {@link java.util.Optional}.118 * @return this assertion object.119 */120 public SELF contains(VALUE expectedValue) {121 isNotNull();122 checkNotNull(expectedValue);123 if (!actual.isPresent()) throwAssertionError(shouldContain(expectedValue));124 if (!optionalValueComparisonStrategy.areEqual(actual.get(), expectedValue))125 throwAssertionError(shouldContain(actual, expectedValue));126 return myself;127 }128 /**129 * Verifies that the actual {@link java.util.Optional} contains a value and gives this value to the given130 * {@link java.util.function.Consumer} for further assertions. Should be used as a way of deeper asserting on the131 * containing object, as further requirement(s) for the value.132 * <p>133 * Assertions will pass :134 * <pre><code class='java'> // one requirement 135 * assertThat(Optional.of(10)).hasValueSatisfying(i -&gt; { assertThat(i).isGreaterThan(9); });136 *137 * // multiple requirements138 * assertThat(Optional.of(someString)).hasValueSatisfying(s -&gt; {139 * assertThat(s).isEqualTo("something");140 * assertThat(s).startsWith("some");141 * assertThat(s).endsWith("thing");142 * }); </code></pre>143 *144 * Assertions will fail :145 * <pre><code class='java'> assertThat(Optional.of("something")).hasValueSatisfying(s -&gt; {146 * assertThat(s).isEqualTo("something else");147 * });148 *149 * // fail because optional is empty, there is no value to perform assertion on 150 * assertThat(Optional.empty()).hasValueSatisfying(o -&gt; {});</code></pre>151 *152 * @param requirement to further assert on the object contained inside the {@link java.util.Optional}.153 * @return this assertion object.154 */155 public SELF hasValueSatisfying(Consumer<VALUE> requirement) {156 assertValueIsPresent();157 requirement.accept(actual.get());158 return myself;159 }160 /**161 * Verifies that the actual {@link Optional} contains a value which satisfies the given {@link Condition}.162 * <p>163 * Examples:164 * <pre><code class='java'> Condition&lt;TolkienCharacter&gt; isAnElf = new Condition&lt;&gt;(character -&gt; character.getRace() == ELF, "an elf"); 165 * 166 * TolkienCharacter legolas = new TolkienCharacter("Legolas", 1000, ELF);167 * TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);168 * 169 * // assertion succeeds170 * assertThat(Optional.of(legolas)).hasValueSatisfying(isAnElf);171 * 172 * // assertion fails173 * assertThat(Optional.of(frodo)).hasValueSatisfying(isAnElf);</code></pre>174 *175 * @param condition the given condition.176 * @return this assertion object.177 * @throws AssertionError if the actual {@link Optional} is null or empty.178 * @throws NullPointerException if the given condition is {@code null}.179 * @throws AssertionError if the actual value does not satisfy the given condition.180 * @since 3.6.0181 */182 public SELF hasValueSatisfying(Condition<? super VALUE> condition) {183 assertValueIsPresent();184 conditions.assertIs(info, actual.get(), condition);185 return myself;186 }187 /**188 * Verifies that the actual {@link java.util.Optional} contains the given value (alias of {@link #contains(Object)}).189 * <p>190 * Assertion will pass :191 * <pre><code class='java'> assertThat(Optional.of("something")).hasValue("something");192 * assertThat(Optional.of(10)).contains(10);</code></pre>193 *194 * Assertion will fail :195 * <pre><code class='java'> assertThat(Optional.of("something")).hasValue("something else");196 * assertThat(Optional.of(20)).contains(10);</code></pre>197 *198 * @param expectedValue the expected value inside the {@link java.util.Optional}.199 * @return this assertion object.200 */201 public SELF hasValue(VALUE expectedValue) {202 return contains(expectedValue);203 }204 /**205 * Verifies that the actual {@link Optional} contains a value that is an instance of the argument.206 * <p>207 * Assertions will pass:208 *209 * <pre><code class='java'> assertThat(Optional.of("something")).containsInstanceOf(String.class)210 * .containsInstanceOf(Object.class);211 *212 * assertThat(Optional.of(10)).containsInstanceOf(Integer.class);</code></pre>213 *214 * Assertion will fail:215 *216 * <pre><code class='java'> assertThat(Optional.of("something")).containsInstanceOf(Integer.class);</code></pre>217 *218 * @param clazz the expected class of the value inside the {@link Optional}.219 * @return this assertion object.220 */221 public SELF containsInstanceOf(Class<?> clazz) {222 assertValueIsPresent();223 if (!clazz.isInstance(actual.get())) throwAssertionError(shouldContainInstanceOf(actual, clazz));224 return myself;225 }226 /**227 * Use field/property by field/property comparison (including inherited fields/properties) instead of relying on228 * actual type A <code>equals</code> method to compare the {@link Optional} value's object for incoming assertion229 * checks. Private fields are included but this can be disabled using230 * {@link Assertions#setAllowExtractingPrivateFields(boolean)}.231 * <p>232 * This can be handy if <code>equals</code> method of the {@link Optional} value's object to compare does not suit233 * you.234 * </p>235 * Note that the comparison is <b>not</b> recursive, if one of the fields/properties is an Object, it will be236 * compared to the other field/property using its <code>equals</code> method.237 * <p>238 * Example:239 *240 * <pre><code class='java'> TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);241 * TolkienCharacter frodoClone = new TolkienCharacter("Frodo", 33, HOBBIT);242 *243 * // Fail if equals has not been overridden in TolkienCharacter as equals default implementation only compares references244 * assertThat(Optional.of(frodo)).contains(frodoClone);245 *246 * // frodo and frodoClone are equals when doing a field by field comparison.247 * assertThat(Optional.of(frodo)).usingFieldByFieldValueComparator().contains(frodoClone);</code></pre>248 *249 * @return {@code this} assertion object.250 */251 @CheckReturnValue252 public SELF usingFieldByFieldValueComparator() {253 return usingValueComparator(new FieldByFieldComparator());254 }255 /**256 * Use given custom comparator instead of relying on actual type A <code>equals</code> method to compare the257 * {@link Optional} value's object for incoming assertion checks.258 * <p>259 * Custom comparator is bound to assertion instance, meaning that if a new assertion is created, it will use default260 * comparison strategy.261 * <p>262 * Examples :263 *264 * <pre><code class='java'> TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);265 * TolkienCharacter frodoClone = new TolkienCharacter("Frodo", 33, HOBBIT);266 *267 * // Fail if equals has not been overridden in TolkienCharacter as equals default implementation only compares references268 * assertThat(Optional.of(frodo)).contains(frodoClone);269 *270 * // frodo and frodoClone are equals when doing a field by field comparison.271 * assertThat(Optional.of(frodo)).usingValueComparator(new FieldByFieldComparator()).contains(frodoClone);</code></pre>272 *273 * @param customComparator the comparator to use for incoming assertion checks.274 * @throws NullPointerException if the given comparator is {@code null}.275 * @return {@code this} assertion object.276 */277 @CheckReturnValue278 public SELF usingValueComparator(Comparator<? super VALUE> customComparator) {279 optionalValueComparisonStrategy = new ComparatorBasedComparisonStrategy(customComparator);280 return myself;281 }282 /**283 * Revert to standard comparison for incoming assertion {@link Optional} value checks.284 * <p>285 * This method should be used to disable a custom comparison strategy set by calling286 * {@link #usingValueComparator(Comparator)}.287 *288 * @return {@code this} assertion object.289 */290 @CheckReturnValue291 public SELF usingDefaultValueComparator() {292 // fall back to default strategy to compare actual with other objects.293 optionalValueComparisonStrategy = StandardComparisonStrategy.instance();294 return myself;295 }296 /**297 * Verifies that the actual {@link java.util.Optional} contains the instance given as an argument (i.e. it must be the298 * same instance).299 * <p>300 * Assertion will pass :301 *302 * <pre><code class='java'> String someString = "something";303 * assertThat(Optional.of(someString)).containsSame(someString);304 *305 * // Java will create the same 'Integer' instance when boxing small ints306 * assertThat(Optional.of(10)).containsSame(10);</code></pre>307 *308 * Assertion will fail :309 *310 * <pre><code class='java'> // not even equal:311 * assertThat(Optional.of("something")).containsSame("something else");312 * assertThat(Optional.of(20)).containsSame(10);313 *314 * // equal but not the same: 315 * assertThat(Optional.of(new String("something"))).containsSame(new String("something"));316 * assertThat(Optional.of(new Integer(10))).containsSame(new Integer(10));</code></pre>317 *318 * @param expectedValue the expected value inside the {@link java.util.Optional}.319 * @return this assertion object.320 */321 public SELF containsSame(VALUE expectedValue) {322 isNotNull();323 checkNotNull(expectedValue);324 if (!actual.isPresent()) throwAssertionError(shouldContain(expectedValue));325 if (actual.get() != expectedValue) throwAssertionError(shouldContainSame(actual, expectedValue));326 return myself;327 }328 /**329 * Call {@link Optional#flatMap(Function) flatMap} on the {@code Optional} under test, assertions chained afterwards are performed on the {@code Optional} resulting from the flatMap call.330 * <p>331 * Examples:332 * <pre><code class='java'> Function&lt;String, Optional&lt;String&gt;&gt; UPPER_CASE_OPTIONAL_STRING = 333 * s -&gt; s == null ? Optional.empty() : Optional.of(s.toUpperCase());334 * 335 * // assertions succeed336 * assertThat(Optional.of("something")).contains("something")337 * .flatMap(UPPER_CASE_OPTIONAL_STRING)338 * .contains("SOMETHING");339 * 340 * assertThat(Optional.&lt;String&gt;empty()).flatMap(UPPER_CASE_OPTIONAL_STRING)341 * .isEmpty();342 * 343 * assertThat(Optional.&lt;String&gt;ofNullable(null)).flatMap(UPPER_CASE_OPTIONAL_STRING)344 * .isEmpty();345 * 346 * // assertion fails347 * assertThat(Optional.of("something")).flatMap(UPPER_CASE_OPTIONAL_STRING)348 * .contains("something");</code></pre>349 *350 * @param <U> the type wrapped in the {@link Optional} after the {@link Optional#flatMap(Function) flatMap} operation.351 * @param mapper the {@link Function} to use in the {@link Optional#flatMap(Function) flatMap} operation.352 * @return a new {@link AbstractOptionalAssert} for assertions chaining on the flatMap of the Optional.353 * @throws AssertionError if the actual {@link Optional} is null.354 * @since 3.6.0355 */356 @CheckReturnValue357 public <U> AbstractOptionalAssert<?, U> flatMap(Function<? super VALUE, Optional<U>> mapper) {358 isNotNull();359 return assertThat(actual.flatMap(mapper));360 }361 /**362 * Call {@link Optional#map(Function) map} on the {@code Optional} under test, assertions chained afterwards are performed on the {@code Optional} resulting from the map call.363 * <p>364 * Examples:365 * <pre><code class='java'> // assertions succeed 366 * assertThat(Optional.&lt;String&gt;empty()).map(String::length)367 * .isEmpty();368 * 369 * assertThat(Optional.of("42")).contains("42")370 * .map(String::length)371 * .contains(2);372 * 373 * // assertion fails374 * assertThat(Optional.of("42")).map(String::length)375 * .contains(3);</code></pre>376 *377 * @param <U> the type wrapped in the {@link Optional} after the {@link Optional#map(Function) map} operation.378 * @param mapper the {@link Function} to use in the {@link Optional#map(Function) map} operation.379 * @return a new {@link AbstractOptionalAssert} for assertions chaining on the map of the Optional.380 * @throws AssertionError if the actual {@link Optional} is null.381 * @since 3.6.0382 */383 @CheckReturnValue384 public <U> AbstractOptionalAssert<?, U> map(Function<? super VALUE, ? extends U> mapper) {385 isNotNull();386 return assertThat(actual.map(mapper));387 }388 /**389 * Verifies that the actual {@link Optional} is not {@code null} and not empty and returns an Object assertion 390 * that allows chaining (object) assertions on the optional value.391 * <p>392 * Note that it is only possible to return Object assertions after calling this method due to java generics limitations. 393 * <p>394 * Example:395 * <pre><code class='java'> TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);396 * TolkienCharacter sam = new TolkienCharacter("Sam", 38, null);397 *398 * // assertion succeeds since all frodo's fields are set399 * assertThat(Optional.of(frodo)).get().hasNoNullFields();400 *401 * // assertion does not succeed because sam does not have its race set402 * assertThat(Optional.of(sam)).get().hasNoNullFields();</code></pre>403 *404 * @return a new {@link AbstractObjectAssert} for assertions chaining on the value of the Optional.405 * @throws AssertionError if the actual {@link Optional} is null.406 * @throws AssertionError if the actual {@link Optional} is empty.407 * @since 3.9.0408 */409 @CheckReturnValue410 public AbstractObjectAssert<?, VALUE> get() {411 isPresent();412 return assertThat(actual.get());413 }414 private void checkNotNull(Object expectedValue) {415 checkArgument(expectedValue != null, "The expected value should not be <null>.");416 }417 private void assertValueIsPresent() {418 isNotNull();419 if (!actual.isPresent()) throwAssertionError(shouldBePresent(actual));420 }421}...

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1Optional<String> opt = Optional.of("foo");2assertThat(opt).assertValueIsPresent();3Optional<String> opt = Optional.empty();4assertThat(opt).assertValueIsNotPresent();5Optional<String> opt = Optional.of("foo");6assertThat(opt).assertValueSatisfies(value -> assertThat(value).startsWith("f"));7Optional<String> opt = Optional.of("foo");8assertThat(opt).assertValueEquals("foo");9Optional<String> opt = Optional.of("foo");10assertThat(opt).assertValueMatches(value -> value.startsWith("f"));11Optional<Object> opt = Optional.of("foo");12assertThat(opt).assertValueInstanceOf(String.class);13Optional<String> opt = Optional.of("foo");14assertThat(opt).assertValueIsEqualTo("foo");15Optional<String> opt = Optional.of("foo");16assertThat(opt).assertValueIsNotEqualTo("bar");17Optional<String> opt = Optional.of("foo");18assertThat(opt).assertValueIsIn("foo", "bar");19Optional<String> opt = Optional.of("foo");20assertThat(opt).assertValueIsNotIn("bar", "baz");21Optional<String> opt = Optional.of("foo");22assertThat(opt).assertValueIsIn("foo", "bar");23Optional<String> opt = Optional.of("foo");24assertThat(opt).assertValueIsNotIn("bar", "baz");

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1import static org.assertj.core.api.Assertions.assertThat;2import java.util.Optional;3import org.junit.jupiter.api.Test;4public class AssertJOptionalTest {5 public void whenCreateEmptyOptional_thenCorrect() {6 Optional<String> empty = Optional.empty();7 assertThat(empty).isEmpty();8 }9 public void givenOptional_whenIsPresentWorks_thenCorrect() {10 Optional<String> opt = Optional.of("bam");11 assertThat(opt).isPresent();12 assertThat(opt).hasValue("bam");13 assertThat(opt).contains("bam");14 }15 public void whenCreateOfNullable_thenCorrect() {16 String name = "baeldung";17 Optional<String> opt = Optional.ofNullable(name);18 assertThat(opt).isPresent();19 }20 public void givenOptional_whenIfPresentWorks_thenCorrect() {21 Optional<String> opt = Optional.of("bam");22 opt.ifPresent(name -> assertThat(name).isEqualTo("bam"));23 }24 public void givenOptional_whenOrElseWorks_thenCorrect() {25 String nullName = null;26 String name = Optional.ofNullable(nullName).orElse("john");27 assertThat(name).isEqualTo("john");28 }29 public void givenOptional_whenOrElseGetWorks_thenCorrect() {30 String text = null;31 String defaultText = Optional.ofNullable(text).orElseGet(() -> "Default Text");32 assertThat(defaultText).isEqualTo("Default Text");33 }34 public void givenOptional_whenOrElseThrowWorks_thenCorrect() {35 String nullName = null;36 assertThatThrownBy(() -> {37 Optional.ofNullable(nullName).orElseThrow(IllegalArgumentException::new);38 }).isInstanceOf(IllegalArgumentException.class);39 }40 public void givenOptional_whenMapWorks_thenCorrect() {41 Optional<String> name = Optional.of("baeldung");42 Optional<String> upperName = name.map(String::toUpperCase);43 assertThat(upperName).isPresent().contains("BAELDUNG");44 }45 public void givenOptional_whenFlatMapWorks_thenCorrect() {46 Person person = new Person("baeldung", 20);47 String name = Optional.of(person)48 .flatMap(Person::getCar)49 .flatMap(Car::getInsurance)50 .map(Insurance::getName)51 .orElse("Unknown");52 assertThat(name).isEqualTo("Unknown");53 }

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1import static org.assertj.core.api.Assertions.assertThat;2import java.util.Optional;3public class Example {4 public static void main(String[] args) {5 Optional<Integer> optional = Optional.of(1);6 assertThat(optional).isPresent().hasValue(1);7 }8}9import static org.assertj.core.api.Assertions.assertThat;10import java.util.Optional;11class Example {12 void test() {13 Optional<Integer> optional = Optional.of(1);14 assertThat(optional).isPresent().hasValue(1);15 }16}17The following example shows how to use isPresent() method of org.assertj.core.api.AbstractOptionalAssert class:18import static org.assertj.core.api.Assertions.assertThat;19import java.util.Optional;20public class Example {21 public static void main(String[] args) {22 Optional<Integer> optional = Optional.of(1);23 assertThat(optional).isPresent();24 }25}26import static org.assertj.core.api.Assertions.assertThat;27import java.util.Optional;28class Example {29 void test() {30 Optional<Integer> optional = Optional.of(1);31 assertThat(optional).isPresent();32 }33}34The following example shows how to use isNotPresent() method of org.assertj.core.api.AbstractOptionalAssert class:35import static org.assertj.core.api.Assertions.assertThat;36import java.util.Optional;37public class Example {38 public static void main(String[] args) {39 Optional<Integer> optional = Optional.empty();40 assertThat(optional).isNotPresent();41 }42}43import static org.assertj.core.api.Assertions.assertThat;44import java.util.Optional;45class Example {46 void test() {47 Optional<Integer> optional = Optional.empty();48 assertThat(optional).isNotPresent();49 }50}51The following example shows how to use hasValue() method of org.assertj.core.api.AbstractOptionalAssert class:52import static org.assertj.core.api.Assertions.assertThat;53import java.util.Optional;54public class Example {55 public static void main(String[] args) {56 Optional<Integer> optional = Optional.of(1);57 assertThat(optional).hasValue(1);58 }59}60import static org.assertj.core.api.Assertions.assertThat;61import java.util.Optional;62class Example {63 void test() {64 Optional<Integer> optional = Optional.of(1);65 assertThat(optional).hasValue(1);66 }67}

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1import static org.assertj.core.api.Assertions.assertThat;2import java.util.Optional;3import java.util.function.Supplier;4import org.junit.Test;5public class AssertJAssertValueIsPresentTest {6 public void whenAssertValueIsPresent_thenAssertionSucceeds() {7 Optional<String> optional = Optional.of("test");8 assertThat(optional).assertValueIsPresent();9 }10 public void whenAssertValueIsPresent_thenAssertionFails() {11 Optional<String> optional = Optional.empty();12 assertThat(optional).assertValueIsPresent();13 }14}

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1import org.junit.jupiter.api.Test;2import java.util.Optional;3import static org.assertj.core.api.Assertions.*;4public class AssertValueIsPresentTest {5 public void testAssertValueIsPresent() {6 Optional<String> optional = Optional.of("value");7 assertThat(optional).hasValueSatisfying(value -> assertThat(value).isEqualTo("value"));8 }9}10org.junit.jupiter.api.TestInstance$LifecycleMethodExecutionException: Method 'testAssertValueIsPresent()' should be static11at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.lambda$invokeTestInstancePostProcessors$5(ClassTestDescriptor.java:349)12at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.executeAndMaskThrowable(ClassTestDescriptor.java:354)13at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.lambda$invokeTestInstancePostProcessors$6(ClassTestDescriptor.java:349)14at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)15at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655)16at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)17at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)18at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)19at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)20at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)21at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.invokeTestInstancePostProcessors(ClassTestDescriptor.java:350)22at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.instantiateAndPostProcessTestInstance(ClassTestDescriptor.java:270)23at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.lambda$testInstancesProvider$2(ClassTestDescriptor.java:259)24at java.base/java.util.Optional.orElseGet(Optional.java:364)25at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.lambda$testInstancesProvider$3(ClassTestDescriptor.java:258)26at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:31)27at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:101)28at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)29at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:100)

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1import org.junit.jupiter.api.Test;2import java.util.Optional;3import static org.assertj.core.api.Assertions.assertThat;4public class OptionalAssertValueIsPresent {5 public void testValueIsPresent() {6 Optional<String> opt = Optional.of("Hello Optional");7 assertThat(opt).isPresent();8 assertThat(opt).hasValue("Hello Optional");9 assertThat(opt).value().isEqualTo("Hello Optional");10 }11}12 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:103)13 at org.junit.platform.commons.util.ExceptionUtils.lambda$readStackTrace$0(ExceptionUtils.java:139)14 at java.base/java.lang.ThreadLocal$SuppliedThreadLocal.initialValue(ThreadLocal.java:307)15 at java.base/java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:180)16 at java.base/java.lang.ThreadLocal.get(ThreadLocal.java:165)17 at java.base/java.lang.ThreadLocal$SuppliedThreadLocal.get(ThreadLocal.java:312)18 at java.base/java.lang.Thread.getStackTrace(Thread.java:1594)19 at org.junit.platform.commons.util.ExceptionUtils.readStackTrace(ExceptionUtils.java:139)20 at org.junit.platform.commons.util.ExceptionUtils.readStackTrace(ExceptionUtils.java:133)21 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:103)22 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:68)23 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$1(NodeTestTask.java:111)24 at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)25 at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:111)26 at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:79)27 at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)28 at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)29 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)30 at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)31 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java

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1public class OptionalTest {2 public void testOptional() {3 Optional<String> optional = Optional.of("Hello World");4 assertThat(optional).isPresent().hasValue("Hello World");5 }6}

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