Revise TestConventions to retain existing JUnit Platform options

This commit revises the implementation of TestConventions so that
existing JUnit Platform options from a pre-configured `test` task are
copied instead of overridden.

Closes gh-34827

Author: sbrannen

buildSrc/src/main/java/org/springframework/build/TestConventions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,8 @@
 import org.gradle.api.Project;
 import org.gradle.api.plugins.JavaBasePlugin;
 import org.gradle.api.tasks.testing.Test;
+import org.gradle.api.tasks.testing.TestFrameworkOptions;
+import org.gradle.api.tasks.testing.junitplatform.JUnitPlatformOptions;
 import org.gradle.testretry.TestRetryPlugin;
 import org.gradle.testretry.TestRetryTaskExtension;
 
@@ -34,6 +36,7 @@
  *
  * @author Brian Clozel
  * @author Andy Wilkinson
+ * @author Sam Brannen
  */
 class TestConventions {
 
@@ -50,7 +53,12 @@ private void configureTestConventions(Project project) {
 	}
 
 	private void configureTests(Project project, Test test) {
-		test.useJUnitPlatform();
+		TestFrameworkOptions existingOptions = test.getOptions();
+		test.useJUnitPlatform(options -> {
+			if (existingOptions instanceof JUnitPlatformOptions junitPlatformOptions) {
+				options.copyFrom(junitPlatformOptions);
+			}
+		});
 		test.include("**/*Tests.class", "**/*Test.class");
 		test.setSystemProperties(Map.of(
 				"java.awt.headless", "true",

spring-test/spring-test.gradle

@@ -105,14 +105,10 @@ test {
 	description = "Runs JUnit 4, JUnit Jupiter, and TestNG tests."
 	useJUnitPlatform {
 		includeEngines "junit-vintage", "junit-jupiter", "testng"
-		excludeTags "failing-test-case"
 	}
-	// We use `include` instead of `filter.includeTestsMatching`, since
-	// the latter results in some tests being executed/reported
-	// multiple times.
-	include(["**/*Tests.class", "**/*Test.class"])
+	// `include` test filters and system properties are configured in
+	// org.springframework.build.TestConventions in buildSrc.
 	filter.excludeTestsMatching("*TestCase")
-	systemProperty("testGroups", project.properties.get("testGroups"))
-	// Java Util Logging for the JUnit Platform.
+	// Optionally configure Java Util Logging for the JUnit Platform.
 	// systemProperty("java.util.logging.manager", "org.apache.logging.log4j.jul.LogManager")
 }