diff --git a/test/de/inetsoftware/jwebassembly/WasmRule.java b/test/de/inetsoftware/jwebassembly/WasmRule.java
index c415c7d..9cc9ced 100644
--- a/test/de/inetsoftware/jwebassembly/WasmRule.java
+++ b/test/de/inetsoftware/jwebassembly/WasmRule.java
@@ -122,6 +122,24 @@ public class WasmRule extends TemporaryFolder {
         }
     }
 
+    /**
+     * Prepare the rule for the script engine
+     * 
+     * @param script
+     *            the script engine
+     * @throws Exception
+     *             if any error occur
+     */
+    public void before( ScriptEngine script ) throws Exception {
+        switch( script ) {
+            case Wat2Wasm:
+                // this is already part of execute and not only a compile
+                return;
+            default:
+                createCommand( script );
+        }
+    }
+
     /**
      * Write the test data as JSON file.
      * 
@@ -370,6 +388,36 @@ public class WasmRule extends TemporaryFolder {
         }
     }
 
+    /**
+     * Compile the sources and create the ProcessBuilder
+     * 
+     * @param script
+     *            The script engine
+     * @return ProcessBuilder to execute the test
+     * @throws Exception
+     *             if any error occur
+     */
+    private ProcessBuilder createCommand( ScriptEngine script ) throws Exception {
+        switch( script ) {
+            case SpiderMonkey:
+                return spiderMonkeyCommand( true, false );
+            case SpiderMonkeyWat:
+                return spiderMonkeyCommand( false, false );
+            case SpiderMonkeyGC:
+                return spiderMonkeyCommand( true, true );
+            case NodeJS:
+                return nodeJsCommand( nodeScript );
+            case NodeWat:
+                prepareNodeWat();
+                return nodeJsCommand( nodeWatScript );
+            case Wat2Wasm:
+                prepareWat2Wasm();
+                return nodeJsCommand( wat2WasmScript );
+            default:
+                throw new IllegalStateException( script.toString() );
+        }
+    }
+
     /**
      * Evaluate the wasm exported function.
      * 
@@ -395,30 +443,7 @@ public class WasmRule extends TemporaryFolder {
                 writeJsonTestData( Collections.singletonMap( methodName, params ) );
             }
 
-            switch( script ) {
-                case SpiderMonkey:
-                    processBuilder = spiderMonkeyCommand( true, false );
-                    break;
-                case SpiderMonkeyWat:
-                    processBuilder = spiderMonkeyCommand( false, false );
-                    break;
-                case SpiderMonkeyGC:
-                    processBuilder = spiderMonkeyCommand( true, true );
-                    break;
-                case NodeJS:
-                    processBuilder = nodeJsCommand( nodeScript );
-                    break;
-                case NodeWat:
-                    prepareNodeWat();
-                    processBuilder = nodeJsCommand( nodeWatScript );
-                    break;
-                case Wat2Wasm:
-                    prepareWat2Wasm();
-                    processBuilder = nodeJsCommand( wat2WasmScript );
-                    break;
-                default:
-                    throw new IllegalStateException( script.toString() );
-            }
+            processBuilder = createCommand( script );
             processBuilder.directory( getRoot() );
             Process process = processBuilder.start();
             String result = readStream( process.getInputStream() ).trim();
diff --git a/test/de/inetsoftware/jwebassembly/runtime/AbstractBaseTest.java b/test/de/inetsoftware/jwebassembly/runtime/AbstractBaseTest.java
index 22eb0da..c2b3f57 100644
--- a/test/de/inetsoftware/jwebassembly/runtime/AbstractBaseTest.java
+++ b/test/de/inetsoftware/jwebassembly/runtime/AbstractBaseTest.java
@@ -17,6 +17,7 @@ package de.inetsoftware.jwebassembly.runtime;
 
 import java.util.ArrayList;
 
+import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
@@ -66,6 +67,11 @@ public abstract class AbstractBaseTest {
         return method;
     }
 
+    @Before
+    public void before() throws Exception {
+        wasm.before( script );
+    }
+
     @Test
     public void test() {
         wasm.test( script, method, params );