diff --git a/src/test/java/ScannerParserTests.java b/src/test/java/ScannerParserTests.java
index a77b2ca..83f65b8 100644
--- a/src/test/java/ScannerParserTests.java
+++ b/src/test/java/ScannerParserTests.java
@@ -172,7 +172,7 @@ public class ScannerParserTests {
 
     @Test
     public void testMultipleClasses() {
-        Program resultAst = Compiler.generateASTFromFiles(List.of("src/test/testFiles/JavaTestfilesFeatures/MultipleClasses.java"));
+        Program resultAst = Compiler.generateASTFromFiles(List.of("src/test/testFiles/JavaTestfilesFeatures/MultipleClasses1.java"));
         assertEquals(AST_MultipleClasses.get(), resultAst);
     }
 
diff --git a/src/test/java/testResources/CodeGen/Features/ByteCode_MultipleClasses.java b/src/test/java/testResources/CodeGen/Features/ByteCode_MultipleClasses.java
index bbf52a1..13d9d1b 100644
--- a/src/test/java/testResources/CodeGen/Features/ByteCode_MultipleClasses.java
+++ b/src/test/java/testResources/CodeGen/Features/ByteCode_MultipleClasses.java
@@ -2,9 +2,120 @@ package testResources.CodeGen.Features;
 
 import de.maishai.typedast.Type;
 import de.maishai.typedast.typedclass.*;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import testResources.CodeGen.BytecodeTestUtil;
 
 import java.util.List;
 
 public class ByteCode_MultipleClasses {
-    // TODO: implement with multiple Files
+
+    private BytecodeTestUtil util;
+
+    @BeforeEach
+    public void setUp() {
+        try {
+            util = new BytecodeTestUtil(List.of("src/test/testFiles/CodeGenFeatures/MultipleClasses1.java",
+                    "src/test/testFiles/CodeGenFeatures/MultipleClasses2.java"), "MultipleClasses1");
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Test
+    public void testConstructorCount() {
+        Assertions.assertEquals(1, util.getConstructorCount());
+    }
+
+    @Test
+    public void testConstructor() {
+        Assertions.assertEquals("MultipleClasses1", util.getConstructorNames().get(0));
+        Assertions.assertEquals(0, util.getConstructorParameterCount(0));
+        try {
+            Assertions.assertEquals("MultipleClasses1", util.invokeConstructor(new Class<?>[]{}, null).getClass().getName());
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Test
+    public void testMethodCount() {
+        Assertions.assertEquals(1, util.getMethodCount());
+    }
+
+    @Test
+    public void testMethodNames() {
+        Assertions.assertEquals("getIFromAnotherClass", util.getMethodNames().get(0));
+    }
+
+    @Test
+    public void testMethodReturnType() {
+        try {
+            Assertions.assertEquals("int", util.getMethodReturnType("getIFromAnotherClass",
+                    new Class[]{}));
+        } catch (Exception e) {
+            Assertions.fail();
+        }
+    }
+
+    @Test
+    public void testMethodParameters() {
+        try {
+            Assertions.assertEquals(0,
+                    util.getMethodParameterCount("getIFromAnotherClass", new Class<?>[]{}));
+        } catch (Exception e) {
+            Assertions.fail();
+        }
+    }
+
+    @Test
+    public void testFieldCount() {
+        Assertions.assertEquals(1, util.getFieldCount());
+    }
+
+    @Test
+    public void testFieldNames() {
+        Assertions.assertTrue(util.getFieldNames().contains("anotherClass"));
+    }
+
+    @Test
+    public void testFieldType() {
+        try {
+            Assertions.assertEquals("MultipleClasses2", util.getFieldTypes().get(0));
+        } catch (Exception e) {
+            Assertions.fail();
+        }
+    }
+
+    @Test
+    public void testFieldValues() {
+        try {
+            Assertions.assertEquals("MultipleClasses2", util.getFieldValue("anotherClass").getClass().getName());
+        } catch (Exception e) {
+            Assertions.fail();
+        }
+    }
+
+    @Test
+    public void testInvokeConstructor() {
+        try {
+            Object instance = util.invokeConstructor(new Class<?>[]{}, null);
+            Assertions.assertEquals("MultipleClasses1", instance.getClass().getName());
+            Assertions.assertEquals("MultipleClasses2",
+                    util.getFieldValueOfObject(instance, "anotherClass").getClass().getName());
+        } catch (Exception e) {
+            Assertions.fail();
+        }
+    }
+
+    @Test
+    public void testInvokeGetIFromAnotherClass() {
+        try {
+            Assertions.assertEquals(4,
+                    util.invokeMethod("getIFromAnotherClass", new Class<?>[]{}, null));
+        } catch (Exception e) {
+            Assertions.fail();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/test/testFiles/CodeGenFeatures/MultipleClasses.java b/src/test/testFiles/CodeGenFeatures/MultipleClasses.java
deleted file mode 100644
index 84c63bf..0000000
--- a/src/test/testFiles/CodeGenFeatures/MultipleClasses.java
+++ /dev/null
@@ -1,15 +0,0 @@
-public class MultipleClasses {
-    AnotherClass anotherClass;
-
-    public MultipleClasses() {
-        this.anotherClass = new AnotherClass();
-    }
-}
-
-public class AnotherClass {
-    MultipleClasses multipleClasses;
-
-    public AnotherClass() {
-        this.multipleClasses = new MultipleClasses();
-    }
-}
\ No newline at end of file
diff --git a/src/test/testFiles/CodeGenFeatures/MultipleClasses1.java b/src/test/testFiles/CodeGenFeatures/MultipleClasses1.java
new file mode 100644
index 0000000..a86a301
--- /dev/null
+++ b/src/test/testFiles/CodeGenFeatures/MultipleClasses1.java
@@ -0,0 +1,11 @@
+public class MultipleClasses1 {
+    MultipleClasses2 anotherClass;
+
+    public MultipleClasses1() {
+        this.anotherClass = new MultipleClasses2();
+    }
+
+    public int getIFromAnotherClass() {
+        return this.anotherClass.i;
+    }
+}
\ No newline at end of file
diff --git a/src/test/testFiles/CodeGenFeatures/MultipleClasses2.java b/src/test/testFiles/CodeGenFeatures/MultipleClasses2.java
new file mode 100644
index 0000000..43f2228
--- /dev/null
+++ b/src/test/testFiles/CodeGenFeatures/MultipleClasses2.java
@@ -0,0 +1,7 @@
+public class MultipleClasses2 {
+    int i;
+
+    public MultipleClasses2() {
+        this.i = 4;
+    }
+}
\ No newline at end of file