diff --git a/buildSrc/src/test/java/org/springframework/boot/build/architecture/ArchitectureCheckTests.java b/buildSrc/src/test/java/org/springframework/boot/build/architecture/ArchitectureCheckTests.java
index d9c70b2b031a..1294d6192975 100644
--- a/buildSrc/src/test/java/org/springframework/boot/build/architecture/ArchitectureCheckTests.java
+++ b/buildSrc/src/test/java/org/springframework/boot/build/architecture/ArchitectureCheckTests.java
@@ -46,7 +46,7 @@ class ArchitectureCheckTests {
 	void whenPackagesAreTangledTaskFailsAndWritesAReport() throws Exception {
 		prepareTask("tangled", (architectureCheck) -> {
 			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck).length()).isGreaterThan(0);
+			assertThat(failureReport(architectureCheck)).isNotEmpty();
 		});
 	}
 
@@ -54,7 +54,7 @@ void whenPackagesAreTangledTaskFailsAndWritesAReport() throws Exception {
 	void whenPackagesAreNotTangledTaskSucceedsAndWritesAnEmptyReport() throws Exception {
 		prepareTask("untangled", (architectureCheck) -> {
 			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck).length()).isZero();
+			assertThat(failureReport(architectureCheck)).isEmpty();
 		});
 	}
 
@@ -66,7 +66,7 @@ File failureReport(ArchitectureCheck architectureCheck) {
 	void whenBeanPostProcessorBeanMethodIsNotStaticTaskFailsAndWritesAReport() throws Exception {
 		prepareTask("bpp/nonstatic", (architectureCheck) -> {
 			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck).length()).isGreaterThan(0);
+			assertThat(failureReport(architectureCheck)).isNotEmpty();
 		});
 	}
 
@@ -74,7 +74,7 @@ void whenBeanPostProcessorBeanMethodIsNotStaticTaskFailsAndWritesAReport() throw
 	void whenBeanPostProcessorBeanMethodIsStaticAndHasUnsafeParametersTaskFailsAndWritesAReport() throws Exception {
 		prepareTask("bpp/unsafeparameters", (architectureCheck) -> {
 			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck).length()).isGreaterThan(0);
+			assertThat(failureReport(architectureCheck)).isNotEmpty();
 		});
 	}
 
@@ -83,7 +83,7 @@ void whenBeanPostProcessorBeanMethodIsStaticAndHasSafeParametersTaskSucceedsAndW
 			throws Exception {
 		prepareTask("bpp/safeparameters", (architectureCheck) -> {
 			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck).length()).isZero();
+			assertThat(failureReport(architectureCheck)).isEmpty();
 		});
 	}
 
@@ -92,7 +92,7 @@ void whenBeanPostProcessorBeanMethodIsStaticAndHasNoParametersTaskSucceedsAndWri
 			throws Exception {
 		prepareTask("bpp/noparameters", (architectureCheck) -> {
 			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck).length()).isZero();
+			assertThat(failureReport(architectureCheck)).isEmpty();
 		});
 	}
 
@@ -100,7 +100,7 @@ void whenBeanPostProcessorBeanMethodIsStaticAndHasNoParametersTaskSucceedsAndWri
 	void whenBeanFactoryPostProcessorBeanMethodIsNotStaticTaskFailsAndWritesAReport() throws Exception {
 		prepareTask("bfpp/nonstatic", (architectureCheck) -> {
 			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck).length()).isGreaterThan(0);
+			assertThat(failureReport(architectureCheck)).isNotEmpty();
 		});
 	}
 
@@ -108,7 +108,7 @@ void whenBeanFactoryPostProcessorBeanMethodIsNotStaticTaskFailsAndWritesAReport(
 	void whenBeanFactoryPostProcessorBeanMethodIsStaticAndHasParametersTaskFailsAndWritesAReport() throws Exception {
 		prepareTask("bfpp/parameters", (architectureCheck) -> {
 			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck).length()).isGreaterThan(0);
+			assertThat(failureReport(architectureCheck)).isNotEmpty();
 		});
 	}
 
@@ -117,7 +117,7 @@ void whenBeanFactoryPostProcessorBeanMethodIsStaticAndHasNoParametersTaskSucceed
 			throws Exception {
 		prepareTask("bfpp/noparameters", (architectureCheck) -> {
 			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck).length()).isZero();
+			assertThat(failureReport(architectureCheck)).isEmpty();
 		});
 	}
 
diff --git a/buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/ReleaseScheduleTests.java b/buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/ReleaseScheduleTests.java
index f4718e62f075..bbf78521403c 100644
--- a/buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/ReleaseScheduleTests.java
+++ b/buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/ReleaseScheduleTests.java
@@ -37,7 +37,7 @@
  *
  * @author Andy Wilkinson
  */
-public class ReleaseScheduleTests {
+class ReleaseScheduleTests {
 
 	private final RestTemplate rest = new RestTemplate();
 
diff --git a/buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/DependencyVersionUpgradeTests.java b/buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/DependencyVersionUpgradeTests.java
index 7220de730d01..404ae42fe89f 100644
--- a/buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/DependencyVersionUpgradeTests.java
+++ b/buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/DependencyVersionUpgradeTests.java
@@ -40,7 +40,7 @@
  *
  * @author Andy Wilkinson
  */
-public class DependencyVersionUpgradeTests {
+class DependencyVersionUpgradeTests {
 
 	@ParameterizedTest
 	@ArtifactVersion(current = "1.2.3", candidate = "1.2.3")
@@ -244,7 +244,7 @@ void isUpgradeWhenReleaseTrainToSnapshotAndMovingToSnapshotsShouldReturnTrue(Dep
 	static class InputProvider implements ArgumentsProvider {
 
 		@Override
-		public Stream<? extends Arguments> provideArguments(ExtensionContext context) throws Exception {
+		public Stream<? extends Arguments> provideArguments(ExtensionContext context) {
 			Method testMethod = context.getRequiredTestMethod();
 			Stream<Arguments> artifactVersions = artifactVersions(testMethod)
 				.map((artifactVersion) -> Arguments.of(VersionType.ARTIFACT_VERSION.parse(artifactVersion.current()),