#779 Allow to select only one compiler in a processor test class, but make the config-annotation deprecated to empasise that it's only to be used temporarily during debugging.

processor/src/test/java/org/mapstruct/ap/testutil/runner/AnnotationProcessorTestRunner.java

@@ -60,7 +60,18 @@ public class AnnotationProcessorTestRunner extends ParentRunner<Runner> {
     public AnnotationProcessorTestRunner(Class<?> klass) throws Exception {
         super( klass );
 
-        runners = Arrays.<Runner> asList(
+        runners = createRunners( klass );
+    }
+
+    @SuppressWarnings("deprecation")
+    private List<Runner> createRunners(Class<?> klass) throws Exception {
+        WithSingleCompiler singleCompiler = klass.getAnnotation( WithSingleCompiler.class );
+
+        if (singleCompiler != null) {
+            return Arrays.<Runner> asList( new InnerAnnotationProcessorRunner( klass, singleCompiler.value() ) );
+        }
+
+        return Arrays.<Runner> asList(
             new InnerAnnotationProcessorRunner( klass, Compiler.JDK ),
             new InnerAnnotationProcessorRunner( klass, Compiler.ECLIPSE ) );
     }

processor/src/test/java/org/mapstruct/ap/testutil/runner/WithSingleCompiler.java

@@ -0,0 +1,42 @@
+/**
+ *  Copyright 2012-2016 Gunnar Morling (http://www.gunnarmorling.de/)
+ *  and/or other contributors as indicated by the @authors tag. See the
+ *  copyright.txt file in the distribution for a full listing of all
+ *  contributors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.mapstruct.ap.testutil.runner;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Temporarily only use the specified compiler for the test during debugging / implementation.
+ * <p>
+ * Do not commit tests with this annotation present!
+ *
+ * @deprecated Do not commit tests with this annotation present. Tests are expected to work with all compilers.
+ * @author Andreas Gudian
+ */
+@Deprecated
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface WithSingleCompiler {
+    /**
+     * @return The compiler to use.
+     */
+    Compiler value();
+}