Add 'exportsTo' configuration option for whitebox tests

Resolves #67

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## 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
+* [#67](https://github.com/gradlex-org/java-module-testing/issues/67) Whitebox Test Suites: add `exportsTo` configuration option
 
 ## 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

README.md

@@ -80,6 +80,7 @@ Whitebox Test Suites might require additional configuration, which can be done l
 javaModuleTesting.whitebox(testing.suites["test"]) {
     requires.add("org.junit.jupiter.api")
     // opensTo.add("org.junit.platform.commons") <-- opensTo 'org.junit.platform.commons' is done by default
+    // exportsTo.add("...")
 }
 ```
 

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

@@ -250,6 +250,7 @@ private void configureJvmTestSuiteForWhitebox(JvmTestSuite jvmTestSuite, Whitebo
             argumentProvider.testRequires(JavaModuleDependenciesBridge.getRuntimeClasspathModules(project, testSources));
             argumentProvider.testRequires(whiteboxJvmTestSuite.getRequires());
             argumentProvider.testOpensTo(whiteboxJvmTestSuite.getOpensTo());
+            argumentProvider.testExportsTo(whiteboxJvmTestSuite.getExportsTo());
         });
 
         Configuration implementation = configurations.getByName(testSources.getImplementationConfigurationName());

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

@@ -54,4 +54,12 @@ public interface WhiteboxJvmTestSuite {
      * @return modifiable list of addition '--add-opens'
      */
     ListProperty<String> getOpensTo();
+
+    /**
+     * Export all packages of this Whitebox Test Suite to a given Module
+     * for access to public methods at runtime.
+     *
+     * @return modifiable list of addition '--add-exports'
+     */
+    ListProperty<String> getExportsTo();
 }

src/main/java/org/gradlex/javamodule/testing/internal/provider/WhiteboxTestRuntimeArgumentProvider.java

@@ -38,6 +38,7 @@ public class WhiteboxTestRuntimeArgumentProvider implements CommandLineArgumentP
 
     private final ListProperty<String> allTestRequires;
     private final ListProperty<String> allTestOpensTo;
+    private final ListProperty<String> allTestExportsTo;
 
     public WhiteboxTestRuntimeArgumentProvider(Set<File> mainSourceFolders,
                                                Provider<Directory> testClassesFolders, File resourcesUnderTest, File testResources,
@@ -50,6 +51,7 @@ public WhiteboxTestRuntimeArgumentProvider(Set<File> mainSourceFolders,
         this.moduleInfoParser = moduleInfoParser;
         this.allTestRequires = objects.listProperty(String.class);
         this.allTestOpensTo = objects.listProperty(String.class);
+        this.allTestExportsTo = objects.listProperty(String.class);
     }
 
     public void testRequires(Provider<List<String>> testRequires) {
@@ -60,12 +62,12 @@ public void testRequires(List<String> testRequires) {
         allTestRequires.addAll(testRequires);
     }
 
-    public void testOpensTo(Provider<List<String>> testRequires) {
-        allTestOpensTo.addAll(testRequires);
+    public void testOpensTo(Provider<List<String>> testOpensTo) {
+        allTestOpensTo.addAll(testOpensTo);
     }
 
-    public void testOpensTo(List<String> testRequires) {
-        allTestOpensTo.addAll(testRequires);
+    public void testExportsTo(Provider<List<String>> testExportsTo) {
+        allTestExportsTo.addAll(testExportsTo);
     }
 
     @Override
@@ -96,6 +98,13 @@ public Iterable<String> asArguments() {
             }
         }
 
+        for (String packageName : allTestClassPackages) {
+            for (String opensTo : allTestExportsTo.get()) {
+                args.add("--add-exports");
+                args.add(moduleName + "/" + packageName + "=" + opensTo);
+            }
+        }
+
         // Patch into Module located in the 'main' classes folder: test classes, resources, test resources
         args.add("--patch-module");
         args.add(moduleName + "=" +

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

@@ -53,6 +53,34 @@ class CustomizationTest extends Specification {
         result.task(":app:test").outcome == TaskOutcome.SUCCESS
     }
 
+    def "can customize whitebox test suites with exportsTo"() {
+        given:
+        def mainTest = file("app/src/test/java/org/example/app/test/MainTest.java")
+        // make test public, so that 'exportsTo org.junit.platform.commons' is sufficient
+        mainTest.text = mainTest.text.replace('void testApp()' , 'public void testApp()')
+
+        appBuildFile << '''
+            javaModuleTesting.classpath(testing.suites["test"]) // reset default setup
+            javaModuleTesting.whitebox(testing.suites["test"]) {
+                requires.add("org.junit.jupiter.api")
+                exportsTo.add("org.junit.platform.commons")
+            }
+        '''
+        appModuleInfoFile << '''
+            module org.example.app {
+            }
+        '''
+
+        when:
+        def result = runTests()
+
+        then:
+        result.output.contains('Main Module: org.example.app')
+        result.output.contains('Test Module: org.example.app')
+        result.task(":app:test").outcome == TaskOutcome.SUCCESS
+    }
+
+
     def "repetitive blackbox calls on the same test suite have no effect"() {
         given:
         appBuildFile << '''