Use idiomatic AssertJ assertions

1. Replace assertThat(x.isEmpty()).isTrue() with assertThat(x).isEmpty()
Search for : assertThat\((.+).isEmpty\(\)\).isTrue\(\)
Replace with : assertThat($1).isEmpty()
Search for : assertThat\((.+).isEmpty\(\)\).isFalse\(\)
Replace with : assertThat($1).isNotEmpty()

2. Replace assertThat(x.iterator().next()) with assertThat(x).element(0)
Search for : assertThat\((.+).iterator\(\).next\(\)\)
Replace with : assertThat($1).element(0)

3. Replace assertThat(x.get(i)). with assertThat(x).element(i).
Search for : assertThat\((.+)\.get\((\d+)\)\)\.
Replace with : assertThat($1).element($2).

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/observation/ObservationAutoConfigurationTests.java

@@ -249,11 +249,11 @@ void autoConfiguresObservationHandlers() {
 			assertThat(handlers).hasSize(2);
 			// Multiple MeterObservationHandler are wrapped in
 			// FirstMatchingCompositeObservationHandler, which calls only the first one
-			assertThat(handlers.get(0)).isInstanceOf(CustomMeterObservationHandler.class);
+			assertThat(handlers).element(0).isInstanceOf(CustomMeterObservationHandler.class);
 			assertThat(((CustomMeterObservationHandler) handlers.get(0)).getName())
 				.isEqualTo("customMeterObservationHandler1");
 			// Regular handlers are registered last
-			assertThat(handlers.get(1)).isInstanceOf(CustomObservationHandler.class);
+			assertThat(handlers).element(1).isInstanceOf(CustomObservationHandler.class);
 			assertThat(context).doesNotHaveBean(DefaultMeterObservationHandler.class);
 			assertThat(context).doesNotHaveBean(TracingAwareMeterObservationHandler.class);
 		});
@@ -268,7 +268,7 @@ void autoConfiguresObservationHandlerWithCustomContext() {
 				CustomContext customContext = new CustomContext();
 				Observation.start("test-observation", () -> customContext, observationRegistry).stop();
 				assertThat(handlers).hasSize(1);
-				assertThat(handlers.get(0)).isInstanceOf(ObservationHandlerWithCustomContext.class);
+				assertThat(handlers).element(0).isInstanceOf(ObservationHandlerWithCustomContext.class);
 				assertThat(context).hasSingleBean(DefaultMeterObservationHandler.class);
 				assertThat(context).doesNotHaveBean(TracingAwareMeterObservationHandler.class);
 			});
@@ -283,7 +283,7 @@ void autoConfiguresTracingAwareMeterObservationHandler() {
 			// TracingAwareMeterObservationHandler that we don't test here
 			Observation.start("test-observation", observationRegistry);
 			assertThat(handlers).hasSize(1);
-			assertThat(handlers.get(0)).isInstanceOf(CustomTracingObservationHandler.class);
+			assertThat(handlers).element(0).isInstanceOf(CustomTracingObservationHandler.class);
 			assertThat(context).hasSingleBean(TracingAwareMeterObservationHandler.class);
 			assertThat(context.getBeansOfType(ObservationHandler.class)).hasSize(2);
 		});
@@ -298,16 +298,16 @@ void autoConfiguresObservationHandlerWhenTracingIsActive() {
 			assertThat(handlers).hasSize(3);
 			// Multiple TracingObservationHandler are wrapped in
 			// FirstMatchingCompositeObservationHandler, which calls only the first one
-			assertThat(handlers.get(0)).isInstanceOf(CustomTracingObservationHandler.class);
+			assertThat(handlers).element(0).isInstanceOf(CustomTracingObservationHandler.class);
 			assertThat(((CustomTracingObservationHandler) handlers.get(0)).getName())
 				.isEqualTo("customTracingHandler1");
 			// Multiple MeterObservationHandler are wrapped in
 			// FirstMatchingCompositeObservationHandler, which calls only the first one
-			assertThat(handlers.get(1)).isInstanceOf(CustomMeterObservationHandler.class);
+			assertThat(handlers).element(1).isInstanceOf(CustomMeterObservationHandler.class);
 			assertThat(((CustomMeterObservationHandler) handlers.get(1)).getName())
 				.isEqualTo("customMeterObservationHandler1");
 			// Regular handlers are registered last
-			assertThat(handlers.get(2)).isInstanceOf(CustomObservationHandler.class);
+			assertThat(handlers).element(2).isInstanceOf(CustomObservationHandler.class);
 			assertThat(context).doesNotHaveBean(TracingAwareMeterObservationHandler.class);
 			assertThat(context).doesNotHaveBean(DefaultMeterObservationHandler.class);
 		});

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/observation/ObservationHandlerGroupingTests.java

@@ -50,12 +50,12 @@ void shouldGroupCategoriesIntoFirstMatchingHandlerAndRespectCategoryOrder() {
 		List<ObservationHandler<?>> handlers = getObservationHandlers(config);
 		assertThat(handlers).hasSize(2);
 		// Category A is first
-		assertThat(handlers.get(0)).isInstanceOf(FirstMatchingCompositeObservationHandler.class);
+		assertThat(handlers).element(0).isInstanceOf(FirstMatchingCompositeObservationHandler.class);
 		FirstMatchingCompositeObservationHandler firstMatching0 = (FirstMatchingCompositeObservationHandler) handlers
 			.get(0);
 		assertThat(firstMatching0.getHandlers()).containsExactly(handlerA1, handlerA2);
 		// Category B is second
-		assertThat(handlers.get(1)).isInstanceOf(FirstMatchingCompositeObservationHandler.class);
+		assertThat(handlers).element(1).isInstanceOf(FirstMatchingCompositeObservationHandler.class);
 		FirstMatchingCompositeObservationHandler firstMatching1 = (FirstMatchingCompositeObservationHandler) handlers
 			.get(1);
 		assertThat(firstMatching1.getHandlers()).containsExactly(handlerB1, handlerB2);
@@ -72,12 +72,12 @@ void uncategorizedHandlersShouldBeOrderedAfterCategories() {
 		List<ObservationHandler<?>> handlers = getObservationHandlers(config);
 		assertThat(handlers).hasSize(2);
 		// Category A is first
-		assertThat(handlers.get(0)).isInstanceOf(FirstMatchingCompositeObservationHandler.class);
+		assertThat(handlers).element(0).isInstanceOf(FirstMatchingCompositeObservationHandler.class);
 		FirstMatchingCompositeObservationHandler firstMatching0 = (FirstMatchingCompositeObservationHandler) handlers
 			.get(0);
 		// Uncategorized handlers follow
 		assertThat(firstMatching0.getHandlers()).containsExactly(handlerA1, handlerA2);
-		assertThat(handlers.get(1)).isEqualTo(handlerB1);
+		assertThat(handlers).element(1).isEqualTo(handlerB1);
 	}
 
 	@SuppressWarnings("unchecked")

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/security/reactive/ReactiveManagementWebSecurityAutoConfigurationTests.java

@@ -82,7 +82,7 @@ void permitAllForHealth() {
 	@Test
 	void securesEverythingElse() {
 		this.contextRunner.run((context) -> {
-			assertThat(getAuthenticateHeader(context, "/actuator").get(0)).contains("Basic realm=");
+			assertThat(getAuthenticateHeader(context, "/actuator")).element(0).asString().contains("Basic realm=");
 			assertThat(getAuthenticateHeader(context, "/foo").toString()).contains("Basic realm=");
 		});
 	}
@@ -91,7 +91,7 @@ void securesEverythingElse() {
 	void usesMatchersBasedOffConfiguredActuatorBasePath() {
 		this.contextRunner.withPropertyValues("management.endpoints.web.base-path=/").run((context) -> {
 			assertThat(getAuthenticateHeader(context, "/health")).isNull();
-			assertThat(getAuthenticateHeader(context, "/foo").get(0)).contains("Basic realm=");
+			assertThat(getAuthenticateHeader(context, "/foo")).element(0).asString().contains("Basic realm=");
 		});
 	}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/MicrometerTracingAutoConfigurationTests.java

@@ -80,7 +80,7 @@ void shouldSupplyBeansInCorrectOrder() {
 					.isInstanceOf(PropagatingReceiverTracingObservationHandler.class);
 				assertThat(tracingObservationHandlers.get(1))
 					.isInstanceOf(PropagatingSenderTracingObservationHandler.class);
-				assertThat(tracingObservationHandlers.get(2)).isInstanceOf(DefaultTracingObservationHandler.class);
+				assertThat(tracingObservationHandlers).element(2).isInstanceOf(DefaultTracingObservationHandler.class);
 			});
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpointSerializationTests.java

@@ -203,7 +203,7 @@ void testList() {
 			Map<String, Object> map = foo.getProperties();
 			assertThat(map).isNotNull();
 			assertThat(map).hasSize(3);
-			assertThat(((List<String>) map.get("list")).get(0)).isEqualTo("foo");
+			assertThat(((List<String>) map.get("list"))).element(0).isEqualTo("foo");
 		});
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpointTests.java

@@ -127,8 +127,8 @@ void descriptorWithSimpleList() {
 				assertThat(properties.get("simpleList")).isInstanceOf(List.class);
 				List<String> list = (List<String>) properties.get("simpleList");
 				assertThat(list).hasSize(2);
-				assertThat(list.get(0)).isEqualTo("a");
-				assertThat(list.get(1)).isEqualTo("b");
+				assertThat(list).element(0).isEqualTo("a");
+				assertThat(list).element(1).isEqualTo("b");
 			}, (inputs) -> {
 				List<Object> list = (List<Object>) inputs.get("simpleList");
 				assertThat(list).hasSize(2);

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cache/CacheAutoConfigurationTests.java

@@ -762,7 +762,7 @@ void autoConfiguredCacheManagerCanBeSwapped() {
 				getCacheManager(context, SimpleCacheManager.class);
 				CacheManagerPostProcessor postProcessor = context.getBean(CacheManagerPostProcessor.class);
 				assertThat(postProcessor.cacheManagers).hasSize(1);
-				assertThat(postProcessor.cacheManagers.get(0)).isInstanceOf(CaffeineCacheManager.class);
+				assertThat(postProcessor.cacheManagers).element(0).isInstanceOf(CaffeineCacheManager.class);
 			});
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/http/HttpMessageConvertersTests.java

@@ -93,8 +93,8 @@ void addNewConverters() {
 		HttpMessageConverter<?> converter1 = mock(HttpMessageConverter.class);
 		HttpMessageConverter<?> converter2 = mock(HttpMessageConverter.class);
 		HttpMessageConverters converters = new HttpMessageConverters(converter1, converter2);
-		assertThat(converters.getConverters().get(0)).isEqualTo(converter1);
-		assertThat(converters.getConverters().get(1)).isEqualTo(converter2);
+		assertThat(converters.getConverters()).element(0).isEqualTo(converter1);
+		assertThat(converters.getConverters()).element(1).isEqualTo(converter2);
 	}
 
 	@Test
@@ -103,8 +103,8 @@ void convertersAreAddedToFormPartConverter() {
 		HttpMessageConverter<?> converter2 = mock(HttpMessageConverter.class);
 		List<HttpMessageConverter<?>> converters = new HttpMessageConverters(converter1, converter2).getConverters();
 		List<HttpMessageConverter<?>> partConverters = extractFormPartConverters(converters);
-		assertThat(partConverters.get(0)).isEqualTo(converter1);
-		assertThat(partConverters.get(1)).isEqualTo(converter2);
+		assertThat(partConverters).element(0).isEqualTo(converter1);
+		assertThat(partConverters).element(1).isEqualTo(converter2);
 	}
 
 	@Test

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/http/codec/CodecsAutoConfigurationTests.java

@@ -95,7 +95,7 @@ void userProvidedCustomizerCanOverrideJacksonCodecCustomizer() {
 			.run((context) -> {
 				List<CodecCustomizer> codecCustomizers = context.getBean(CodecCustomizers.class).codecCustomizers;
 				assertThat(codecCustomizers).hasSize(3);
-				assertThat(codecCustomizers.get(2)).isInstanceOf(TestCodecCustomizer.class);
+				assertThat(codecCustomizers).element(2).isInstanceOf(TestCodecCustomizer.class);
 			});
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jms/activemq/ActiveMQPropertiesTests.java

@@ -63,7 +63,7 @@ void setTrustedPackages() {
 			.createConnectionFactory(ActiveMQConnectionFactory.class);
 		assertThat(factory.isTrustAllPackages()).isFalse();
 		assertThat(factory.getTrustedPackages()).hasSize(1);
-		assertThat(factory.getTrustedPackages().get(0)).isEqualTo("trusted.package");
+		assertThat(factory.getTrustedPackages()).element(0).isEqualTo("trusted.package");
 	}
 
 	private ActiveMQConnectionFactoryFactory createFactory(ActiveMQProperties properties) {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/client/RestTemplateAutoConfigurationTests.java

@@ -136,7 +136,8 @@ void restTemplateWhenHasCustomBuilderShouldUseCustomBuilder() {
 				assertThat(context).hasSingleBean(RestTemplate.class);
 				RestTemplate restTemplate = context.getBean(RestTemplate.class);
 				assertThat(restTemplate.getMessageConverters()).hasSize(1);
-				assertThat(restTemplate.getMessageConverters().get(0)).isInstanceOf(CustomHttpMessageConverter.class);
+				assertThat(restTemplate.getMessageConverters()).element(0)
+					.isInstanceOf(CustomHttpMessageConverter.class);
 				then(context.getBean(RestTemplateCustomizer.class)).shouldHaveNoInteractions();
 			});
 	}
@@ -150,7 +151,8 @@ void restTemplateWhenHasCustomBuilderCouldReuseBuilderConfigurer() {
 				assertThat(context).hasSingleBean(RestTemplate.class);
 				RestTemplate restTemplate = context.getBean(RestTemplate.class);
 				assertThat(restTemplate.getMessageConverters()).hasSize(1);
-				assertThat(restTemplate.getMessageConverters().get(0)).isInstanceOf(CustomHttpMessageConverter.class);
+				assertThat(restTemplate.getMessageConverters()).element(0)
+					.isInstanceOf(CustomHttpMessageConverter.class);
 				RestTemplateCustomizer customizer = context.getBean(RestTemplateCustomizer.class);
 				then(customizer).should().customize(restTemplate);
 			});

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/HttpEncodingAutoConfigurationTests.java

@@ -124,8 +124,8 @@ void filterIsOrderedHighest() {
 		load(OrderedConfiguration.class);
 		List<Filter> beans = new ArrayList<>(this.context.getBeansOfType(Filter.class).values());
 		AnnotationAwareOrderComparator.sort(beans);
-		assertThat(beans.get(0)).isInstanceOf(CharacterEncodingFilter.class);
-		assertThat(beans.get(1)).isInstanceOf(HiddenHttpMethodFilter.class);
+		assertThat(beans).element(0).isInstanceOf(CharacterEncodingFilter.class);
+		assertThat(beans).element(1).isInstanceOf(HiddenHttpMethodFilter.class);
 	}
 
 	@Test

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfigurationTests.java

@@ -219,7 +219,7 @@ void resourceHandlerMappingOverrideWebjars() {
 		this.contextRunner.withUserConfiguration(WebJars.class).run((context) -> {
 			Map<String, List<Resource>> locations = getResourceMappingLocations(context);
 			assertThat(locations.get("/webjars/**")).hasSize(1);
-			assertThat(locations.get("/webjars/**").get(0)).isEqualTo(new ClassPathResource("/foo/"));
+			assertThat(locations.get("/webjars/**")).element(0).isEqualTo(new ClassPathResource("/foo/"));
 		});
 	}
 
@@ -228,7 +228,7 @@ void resourceHandlerMappingOverrideAll() {
 		this.contextRunner.withUserConfiguration(AllResources.class).run((context) -> {
 			Map<String, List<Resource>> locations = getResourceMappingLocations(context);
 			assertThat(locations.get("/**")).hasSize(1);
-			assertThat(locations.get("/**").get(0)).isEqualTo(new ClassPathResource("/foo/"));
+			assertThat(locations.get("/**")).element(0).isEqualTo(new ClassPathResource("/foo/"));
 		});
 	}
 

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/livereload/LiveReloadServerTests.java

@@ -115,8 +115,8 @@ void triggerReload() throws Exception {
 		this.server.triggerReload();
 		List<String> messages = await().atMost(Duration.ofSeconds(10))
 			.until(handler::getMessages, (msgs) -> msgs.size() == 2);
-		assertThat(messages.get(0)).contains("http://livereload.com/protocols/official-7");
-		assertThat(messages.get(1)).contains("command\":\"reload\"");
+		assertThat(messages).element(0).asString().contains("http://livereload.com/protocols/official-7");
+		assertThat(messages).element(1).asString().contains("command\":\"reload\"");
 	}
 
 	@Test // gh-26813
@@ -125,8 +125,8 @@ void triggerReloadWithUppercaseHeaders() throws Exception {
 		this.server.triggerReload();
 		List<String> messages = await().atMost(Duration.ofSeconds(10))
 			.until(handler::getMessages, (msgs) -> msgs.size() == 2);
-		assertThat(messages.get(0)).contains("http://livereload.com/protocols/official-7");
-		assertThat(messages.get(1)).contains("command\":\"reload\"");
+		assertThat(messages).element(0).asString().contains("http://livereload.com/protocols/official-7");
+		assertThat(messages).element(1).asString().contains("command\":\"reload\"");
 	}
 
 	@Test

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/build/BuildpackResolversTests.java

@@ -57,7 +57,7 @@ void resolveAllWithBuilderBuildpackReferenceReturnsExpectedBuildpack() {
 		BuildpackReference reference = BuildpackReference.of("urn:cnb:builder:paketo-buildpacks/[email protected]");
 		Buildpacks buildpacks = BuildpackResolvers.resolveAll(this.resolverContext, Collections.singleton(reference));
 		assertThat(buildpacks.getBuildpacks()).hasSize(1);
-		assertThat(buildpacks.getBuildpacks().get(0)).isInstanceOf(BuilderBuildpack.class);
+		assertThat(buildpacks.getBuildpacks()).element(0).isInstanceOf(BuilderBuildpack.class);
 	}
 
 	@Test
@@ -67,7 +67,7 @@ void resolveAllWithDirectoryBuildpackReferenceReturnsExpectedBuildpack(@TempDir
 		BuildpackReference reference = BuildpackReference.of(temp.toAbsolutePath().toString());
 		Buildpacks buildpacks = BuildpackResolvers.resolveAll(this.resolverContext, Collections.singleton(reference));
 		assertThat(buildpacks.getBuildpacks()).hasSize(1);
-		assertThat(buildpacks.getBuildpacks().get(0)).isInstanceOf(DirectoryBuildpack.class);
+		assertThat(buildpacks.getBuildpacks()).element(0).isInstanceOf(DirectoryBuildpack.class);
 	}
 
 	@Test
@@ -77,7 +77,7 @@ void resolveAllWithTarGzipBuildpackReferenceReturnsExpectedBuildpack(@TempDir Fi
 		BuildpackReference reference = BuildpackReference.of(archive.toString());
 		Buildpacks buildpacks = BuildpackResolvers.resolveAll(this.resolverContext, Collections.singleton(reference));
 		assertThat(buildpacks.getBuildpacks()).hasSize(1);
-		assertThat(buildpacks.getBuildpacks().get(0)).isInstanceOf(TarGzipBuildpack.class);
+		assertThat(buildpacks.getBuildpacks()).element(0).isInstanceOf(TarGzipBuildpack.class);
 	}
 
 	@Test
@@ -89,7 +89,7 @@ void resolveAllWithImageBuildpackReferenceReturnsExpectedBuildpack() throws IOEx
 		BuildpackReference reference = BuildpackReference.of("docker://example/buildpack1:latest");
 		Buildpacks buildpacks = BuildpackResolvers.resolveAll(resolverContext, Collections.singleton(reference));
 		assertThat(buildpacks.getBuildpacks()).hasSize(1);
-		assertThat(buildpacks.getBuildpacks().get(0)).isInstanceOf(ImageBuildpack.class);
+		assertThat(buildpacks.getBuildpacks()).element(0).isInstanceOf(ImageBuildpack.class);
 	}
 
 	@Test

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/docker/LogUpdateEventTests.java

@@ -49,15 +49,15 @@ void readAllWhenAnsiStreamReturnsEvents() throws Exception {
 		List<LogUpdateEvent> events = readAll("log-update-event-ansi.stream");
 		assertThat(events).hasSize(20);
 		assertThat(events.get(0).toString()).isEmpty();
-		assertThat(events.get(1)).hasToString("Cloud Foundry OpenJDK Buildpack v1.0.64");
-		assertThat(events.get(2)).hasToString("  OpenJDK JRE 11.0.5: Reusing cached layer");
+		assertThat(events).element(1).hasToString("Cloud Foundry OpenJDK Buildpack v1.0.64");
+		assertThat(events).element(2).hasToString("  OpenJDK JRE 11.0.5: Reusing cached layer");
 	}
 
 	@Test
 	void readSucceedsWhenStreamTypeIsInvalid() throws IOException {
 		List<LogUpdateEvent> events = readAll("log-update-event-invalid-stream-type.stream");
 		assertThat(events).hasSize(1);
-		assertThat(events.get(0)).hasToString("Stream type is out of bounds. Must be >= 0 and < 3, but was 3");
+		assertThat(events).element(0).hasToString("Stream type is out of bounds. Must be >= 0 and < 3, but was 3");
 	}
 
 	private List<LogUpdateEvent> readAll(String name) throws IOException {

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/java/org/springframework/boot/loader/jar/StringSequenceTests.java

@@ -92,12 +92,12 @@ void subSequenceWhenStartPastExistingEndShouldThrowException() {
 
 	@Test
 	void isEmptyWhenEmptyShouldReturnTrue() {
-		assertThat(new StringSequence("").isEmpty()).isTrue();
+		assertThat(new StringSequence("")).isEmpty();
 	}
 
 	@Test
 	void isEmptyWhenNotEmptyShouldReturnFalse() {
-		assertThat(new StringSequence("x").isEmpty()).isFalse();
+		assertThat(new StringSequence("x")).isNotEmpty();
 	}
 
 	@Test

spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/launch/PropertiesLauncherTests.java

@@ -345,7 +345,7 @@ void encodedFileUrlLoaderPathIsHandledCorrectly() throws Exception {
 		this.launcher = new PropertiesLauncher();
 		Set<URL> urls = this.launcher.getClassPathUrls();
 		assertThat(urls).hasSize(1);
-		assertThat(urls.iterator().next()).isEqualTo(loaderPath.toURI().toURL());
+		assertThat(urls).element(0).isEqualTo(loaderPath.toURI().toURL());
 	}
 
 	@Test // gh-21575

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/test/java/org/springframework/boot/maven/DependencyFilterMojoTests.java

@@ -58,7 +58,7 @@ void filterDependencies() throws MojoExecutionException {
 		Set<Artifact> artifacts = mojo.filterDependencies(createArtifact("com.foo", "one"),
 				createArtifact("com.foo", "two"), artifact);
 		assertThat(artifacts).hasSize(1);
-		assertThat(artifacts.iterator().next()).isSameAs(artifact);
+		assertThat(artifacts).element(0).isSameAs(artifact);
 	}
 
 	@Test
@@ -69,7 +69,7 @@ void filterGroupIdExactMatch() throws MojoExecutionException {
 		Set<Artifact> artifacts = mojo.filterDependencies(createArtifact("com.foo", "one"),
 				createArtifact("com.foo", "two"), artifact);
 		assertThat(artifacts).hasSize(1);
-		assertThat(artifacts.iterator().next()).isSameAs(artifact);
+		assertThat(artifacts).element(0).isSameAs(artifact);
 	}
 
 	@Test