diff --git a/test/401-optimizing-compiler/src/Main.java b/test/401-optimizing-compiler/src/Main.java
index aa08137..e5706a5 100644
--- a/test/401-optimizing-compiler/src/Main.java
+++ b/test/401-optimizing-compiler/src/Main.java
@@ -28,6 +28,84 @@
     System.out.println(error);
 
     $opt$TestInvokeNew();
+
+    int result = $opt$TestInvokeIntParameter(42);
+    if (result != 42) {
+      throw new Error("Different value returned: " + result);
+    }
+
+
+    $opt$TestInvokeObjectParameter(new Object());
+
+    Object a = new Object();
+    Object b = $opt$TestInvokeObjectParameter(a);
+    if (a != b) {
+      throw new Error("Different object returned " + a + " " + b);
+    }
+
+    result = $opt$TestInvokeWith2Parameters(10, 9);
+    if (result != 1) {
+      throw new Error("Unexpected result: " + result);
+    }
+
+    result = $opt$TestInvokeWith3Parameters(10, 9, 1);
+    if (result != 0) {
+      throw new Error("Unexpected result: " + result);
+    }
+
+    result = $opt$TestInvokeWith5Parameters(10000, 1000, 100, 10, 1);
+    if (result != 8889) {
+      throw new Error("Unexpected result: " + result);
+    }
+
+    result = $opt$TestInvokeWith7Parameters(100, 6, 5, 4, 3, 2, 1);
+    if (result != 79) {
+      throw new Error("Unexpected result: " + result);
+    }
+
+    Main m = new Main();
+    if (m.$opt$TestThisParameter(m) != m) {
+      throw new Error("Unexpected value returned");
+    }
+
+    if (m.$opt$TestOtherParameter(new Main()) == m) {
+      throw new Error("Unexpected value returned");
+    }
+  }
+
+  static int $opt$TestInvokeIntParameter(int param) {
+    return param;
+  }
+
+  static Object $opt$TestInvokeObjectParameter(Object a) {
+    forceGCStaticMethod();
+    return a;
+  }
+
+  static int $opt$TestInvokeWith2Parameters(int a, int b) {
+    return a - b;
+  }
+
+  static int $opt$TestInvokeWith3Parameters(int a, int b, int c) {
+    return a - b - c;
+  }
+
+  static int $opt$TestInvokeWith5Parameters(int a, int b, int c, int d, int e) {
+    return a - b - c - d - e;
+  }
+
+  static int $opt$TestInvokeWith7Parameters(int a, int b, int c, int d, int e, int f, int g) {
+    return a - b - c - d - e - f - g;
+  }
+
+  Object $opt$TestThisParameter(Object other) {
+    forceGCStaticMethod();
+    return other;
+  }
+
+  Object $opt$TestOtherParameter(Object other) {
+    forceGCStaticMethod();
+    return other;
   }
 
   public static void $opt$TestInvokeStatic() {