Introduce parametrized tests to also test the JceImplementationFactory

pgpainless-core/src/main/java/org/pgpainless/implementation/ImplementationFactory.java

@@ -46,6 +46,11 @@ import org.pgpainless.util.Passphrase;
 
 public abstract class ImplementationFactory {
 
+    enum FactoryType {
+        bc,
+        jce
+    }
+
     private static ImplementationFactory FACTORY_IMPLEMENTATION = new BcImplementationFactory();
 
     public static void setFactoryImplementation(ImplementationFactory implementation) {

pgpainless-core/src/main/java/org/pgpainless/util/TestUtil.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2021 Paul Schaub.
+ *
+ * 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.pgpainless.util;
+
+import org.pgpainless.implementation.BcImplementationFactory;
+import org.pgpainless.implementation.ImplementationFactory;
+import org.pgpainless.implementation.JceImplementationFactory;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Utility class used to provide all available implementations of {@link ImplementationFactory} for parametrized tests.
+ */
+public class TestUtil {
+
+    private static final List<ImplementationFactory> IMPLEMENTATIONS = Arrays.asList(
+            new BcImplementationFactory(),
+            new JceImplementationFactory()
+    );
+
+    public static List<ImplementationFactory> provideImplementationFactories() {
+        return IMPLEMENTATIONS;
+    }
+}