diff --git a/cli/spring-boot-cli/src/test/java/org/springframework/boot/cli/command/init/InitCommandTests.java b/cli/spring-boot-cli/src/test/java/org/springframework/boot/cli/command/init/InitCommandTests.java
index 53ad18de35f..c198632e30f 100644
--- a/cli/spring-boot-cli/src/test/java/org/springframework/boot/cli/command/init/InitCommandTests.java
+++ b/cli/spring-boot-cli/src/test/java/org/springframework/boot/cli/command/init/InitCommandTests.java
@@ -409,8 +409,10 @@ class InitCommandTests extends AbstractHttpClientMockTests {
 	void userAgent() throws Exception {
 		this.command.run("--list", "--target=https://fake-service");
 		then(this.http).should()
-			.executeOpen(any(HttpHost.class), assertArg((request) -> assertThat(
-					request.getHeaders("User-Agent")[0].getValue().startsWith("SpringBootCli/"))), isNull());
+			.executeOpen(any(HttpHost.class),
+					assertArg((request) -> assertThat(request.getHeaders("User-Agent")[0].getValue())
+						.startsWith("SpringBootCli/")),
+					isNull());
 	}
 
 	private void withUserDir(File userDir, ThrowingRunnable action) throws Exception {
diff --git a/core/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jmx/JmxAutoConfigurationTests.java b/core/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jmx/JmxAutoConfigurationTests.java
index f832726a6de..c4f690c5465 100644
--- a/core/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jmx/JmxAutoConfigurationTests.java
+++ b/core/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jmx/JmxAutoConfigurationTests.java
@@ -102,7 +102,7 @@ class JmxAutoConfigurationTests {
 		try (AnnotationConfigApplicationContext parent = new AnnotationConfigApplicationContext()) {
 			parent.register(JmxAutoConfiguration.class);
 			parent.refresh();
-			this.contextRunner.withParent(parent).run((context) -> assertThat(context.isRunning()));
+			this.contextRunner.withParent(parent).run((context) -> assertThat(context.isRunning()).isTrue());
 		}
 	}
 
@@ -113,7 +113,7 @@ class JmxAutoConfigurationTests {
 			parent.refresh();
 			this.contextRunner.withParent(parent)
 				.withConfiguration(UserConfigurations.of(TestConfiguration.class))
-				.run((context) -> assertThat(context.isRunning()));
+				.run((context) -> assertThat(context.isRunning()).isTrue());
 		}
 	}
 
diff --git a/loader/spring-boot-loader/src/test/java/org/springframework/boot/loader/zip/Zip64EndOfCentralDirectoryRecordTests.java b/loader/spring-boot-loader/src/test/java/org/springframework/boot/loader/zip/Zip64EndOfCentralDirectoryRecordTests.java
index 857500cb9e4..0c36514d51a 100644
--- a/loader/spring-boot-loader/src/test/java/org/springframework/boot/loader/zip/Zip64EndOfCentralDirectoryRecordTests.java
+++ b/loader/spring-boot-loader/src/test/java/org/springframework/boot/loader/zip/Zip64EndOfCentralDirectoryRecordTests.java
@@ -52,7 +52,7 @@ class Zip64EndOfCentralDirectoryRecordTests {
 		assertThat(eocd.numberOfCentralDirectoryEntriesOnThisDisk()).isEqualTo(6);
 		assertThat(eocd.totalNumberOfCentralDirectoryEntries()).isEqualTo(7);
 		assertThat(eocd.sizeOfCentralDirectory()).isEqualTo(8);
-		assertThat(eocd.offsetToStartOfCentralDirectory());
+		assertThat(eocd.offsetToStartOfCentralDirectory()).isEqualTo(9);
 	}
 
 	@Test
diff --git a/module/spring-boot-elasticsearch/src/test/java/org/springframework/boot/elasticsearch/autoconfigure/ElasticsearchRestClientAutoConfigurationTests.java b/module/spring-boot-elasticsearch/src/test/java/org/springframework/boot/elasticsearch/autoconfigure/ElasticsearchRestClientAutoConfigurationTests.java
index 64592e88c7f..a507a8c3917 100644
--- a/module/spring-boot-elasticsearch/src/test/java/org/springframework/boot/elasticsearch/autoconfigure/ElasticsearchRestClientAutoConfigurationTests.java
+++ b/module/spring-boot-elasticsearch/src/test/java/org/springframework/boot/elasticsearch/autoconfigure/ElasticsearchRestClientAutoConfigurationTests.java
@@ -203,8 +203,8 @@ class ElasticsearchRestClientAutoConfigurationTests {
 			Rest5Client client = context.getBean(Rest5Client.class);
 			assertThat(client).extracting("defaultHeaders", InstanceOfAssertFactories.list(Header.class))
 				.satisfiesOnlyOnce((header) -> {
-					assertThat(header.getName().equals("Authorization"));
-					assertThat(header.getValue().equals("ApiKey some-api-key"));
+					assertThat(header.getName()).isEqualTo("Authorization");
+					assertThat(header.getValue()).isEqualTo("ApiKey some-api-key");
 				});
 		});
 	}
@@ -218,8 +218,8 @@ class ElasticsearchRestClientAutoConfigurationTests {
 				Rest5Client client = context.getBean(Rest5Client.class);
 				assertThat(client).extracting("defaultHeaders", InstanceOfAssertFactories.list(Header.class))
 					.satisfiesOnlyOnce((header) -> {
-						assertThat(header.getName().equals("Authorization"));
-						assertThat(header.getValue().equals("ApiKey some-api-key"));
+						assertThat(header.getName()).isEqualTo("Authorization");
+						assertThat(header.getValue()).isEqualTo("ApiKey some-api-key");
 					});
 				assertThat(client)
 					.extracting("client.credentialsProvider", InstanceOfAssertFactories.type(CredentialsProvider.class))
diff --git a/module/spring-boot-rsocket/src/test/java/org/springframework/boot/rsocket/autoconfigure/RSocketServerAutoConfigurationTests.java b/module/spring-boot-rsocket/src/test/java/org/springframework/boot/rsocket/autoconfigure/RSocketServerAutoConfigurationTests.java
index c20f5067f2f..41b67ca22f8 100644
--- a/module/spring-boot-rsocket/src/test/java/org/springframework/boot/rsocket/autoconfigure/RSocketServerAutoConfigurationTests.java
+++ b/module/spring-boot-rsocket/src/test/java/org/springframework/boot/rsocket/autoconfigure/RSocketServerAutoConfigurationTests.java
@@ -174,7 +174,7 @@ class RSocketServerAutoConfigurationTests {
 			.run((context) -> {
 				assertThat(context).hasFailed();
 				assertThat(context.getStartupFailure()).hasRootCauseInstanceOf(NoSuchSslBundleException.class)
-					.withFailMessage("SSL bundle name 'test-bundle' is not valid");
+					.hasRootCauseMessage("SSL bundle name 'test-bundle' cannot be found");
 			});
 	}
 
diff --git a/module/spring-boot-security-saml2/src/test/java/org/springframework/boot/security/saml2/autoconfigure/Saml2RelyingPartyAutoConfigurationTests.java b/module/spring-boot-security-saml2/src/test/java/org/springframework/boot/security/saml2/autoconfigure/Saml2RelyingPartyAutoConfigurationTests.java
index 8061f26a175..3dcaf841d53 100644
--- a/module/spring-boot-security-saml2/src/test/java/org/springframework/boot/security/saml2/autoconfigure/Saml2RelyingPartyAutoConfigurationTests.java
+++ b/module/spring-boot-security-saml2/src/test/java/org/springframework/boot/security/saml2/autoconfigure/Saml2RelyingPartyAutoConfigurationTests.java
@@ -340,8 +340,7 @@ class Saml2RelyingPartyAutoConfigurationTests {
 	void causesManagementWebSecurityAutoConfigurationToBackOff() {
 		WebApplicationContextRunner contextRunner = this.contextRunner.withConfiguration(
 				AutoConfigurations.of(ManagementWebSecurityAutoConfiguration.class, WebMvcAutoConfiguration.class));
-		assertThat(contextRunner
-			.run((context) -> assertThat(context).hasSingleBean(ManagementWebSecurityAutoConfiguration.class)));
+		contextRunner.run((context) -> assertThat(context).hasSingleBean(ManagementWebSecurityAutoConfiguration.class));
 		contextRunner.withPropertyValues(PREFIX
 				+ ".simplesamlphp.assertingparty.single-sign-on.url=https://simplesaml-for-spring-saml/SSOService.php",
 				PREFIX + ".simplesamlphp.assertingparty.single-sign-on.sign-request=false",
diff --git a/module/spring-boot-web-server/src/testFixtures/java/org/springframework/boot/web/server/autoconfigure/reactive/AbstractReactiveWebServerAutoConfigurationTests.java b/module/spring-boot-web-server/src/testFixtures/java/org/springframework/boot/web/server/autoconfigure/reactive/AbstractReactiveWebServerAutoConfigurationTests.java
index ce0fe8a0628..d4d29ca6311 100644
--- a/module/spring-boot-web-server/src/testFixtures/java/org/springframework/boot/web/server/autoconfigure/reactive/AbstractReactiveWebServerAutoConfigurationTests.java
+++ b/module/spring-boot-web-server/src/testFixtures/java/org/springframework/boot/web/server/autoconfigure/reactive/AbstractReactiveWebServerAutoConfigurationTests.java
@@ -107,7 +107,7 @@ public abstract class AbstractReactiveWebServerAutoConfigurationTests {
 			.run((context) -> {
 				assertThat(context).hasFailed();
 				assertThat(context.getStartupFailure().getCause()).isInstanceOf(NoSuchSslBundleException.class)
-					.withFailMessage("test");
+					.hasMessage("SSL bundle name 'test-bundle' cannot be found");
 			});
 	}