testCompileOnly extends compileOnly for Whitebox Test Suites

Resolves #51

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Version 1.5
 * [#47](https://github.com/gradlex-org/java-module-testing/issues/47) Add support for Classpath Test Suites
+* [#51](https://github.com/gradlex-org/java-module-testing/issues/51) testCompileOnly extends compileOnly for Whitebox Test Suites
 
 ## Version 1.4
 * [#2](https://github.com/gradlex-org/java-module-testing/issues/2) New approach to split Module Path and Classpath for whitebox testing

src/main/java/org/gradlex/javamodule/testing/JavaModuleTestingExtension.java

@@ -208,6 +208,9 @@ private void configureJvmTestSuiteForWhitebox(JvmTestSuite jvmTestSuite, Whitebo
         tasks.named(testSources.getCompileJavaTaskName(), JavaCompile.class, compileJava -> {
             SourceSet sourcesUnderTest = whiteboxJvmTestSuite.getSourcesUnderTest().get();
 
+            configurations.getByName(testSources.getCompileOnlyConfigurationName()).extendsFrom(
+                    configurations.getByName(sourcesUnderTest.getCompileOnlyConfigurationName()));
+
             compileJava.setClasspath(sourcesUnderTest.getOutput().plus(configurations.getByName(testSources.getCompileClasspathConfigurationName())));
 
             WhiteboxTestCompileArgumentProvider argumentProvider = (WhiteboxTestCompileArgumentProvider) compileJava.getOptions().getCompilerArgumentProviders().stream()

src/test/groovy/org/gradlex/javamodule/testing/test/CoreFunctionailtyTest.groovy

@@ -0,0 +1,40 @@
+package org.gradlex.javamodule.testing.test
+
+import org.gradle.testkit.runner.TaskOutcome
+import org.gradlex.javamodule.testing.test.fixture.GradleBuild
+import spock.lang.Specification
+
+class CoreFunctionailtyTest extends Specification {
+
+    @Delegate
+    GradleBuild build = new GradleBuild()
+
+    def "testCompileOnly extends compileOnly for whitebox test suites"() {
+        given:
+        appBuildFile << '''
+            javaModuleTesting.classpath(testing.suites["test"])
+            dependencies {
+                compileOnly("jakarta.servlet:jakarta.servlet-api:6.1.0")
+            }
+        '''
+        file("app/src/main/java/org/example/app/ServletImpl.java") << '''
+            package org.example.app;
+            public abstract class ServletImpl implements jakarta.servlet.Servlet { }
+        '''
+        file("app/src/test/java/org/example/app/test/ServletMock.java") << '''
+            package org.example.app.test;
+            public abstract class ServletMock extends org.example.app.ServletImpl { }
+        '''
+        appModuleInfoFile << '''
+            module org.example.app {
+                requires static jakarta.servlet;
+            }
+        '''
+
+        when:
+        def result = runner('compileTestJava').build()
+
+        then:
+        result.task(':app:compileTestJava').outcome == TaskOutcome.SUCCESS
+    }
+}