add ByteCodeTestUtil

src/test/java/BytecodeTestUtil.java

@@ -0,0 +1,28 @@
+import de.maishai.Compiler;
+
+import java.lang.reflect.Method;
+import java.util.List;
+
+public class BytecodeTestUtil {
+
+    private Class<?> clazz;
+
+    public BytecodeTestUtil(String sourceFilePath, String className) throws Exception {
+        byte[] resultBytecode = Compiler.generateByteCodeArrayFromFile(List.of(sourceFilePath)).get(0);
+
+        ClassLoader classLoader = new ClassLoader() {
+            @Override
+            protected Class<?> findClass(String name) {
+                return defineClass(name, resultBytecode, 0, resultBytecode.length);
+            }
+        };
+        clazz = classLoader.loadClass(className);
+    }
+
+    public Object invokeMethod(String methodName, Class<?>[] parameterTypes, Object... args) throws Exception {
+        Object instance = clazz.getDeclaredConstructor().newInstance();
+
+        Method method = clazz.getMethod(methodName, parameterTypes);
+        return method.invoke(instance, args);
+    }
+}

src/test/java/CodegeneratorTests.java

@@ -1,9 +1,6 @@
-import de.maishai.Compiler;
-import de.maishai.ast.records.Program;
 import org.junit.jupiter.api.Test;
 
-import java.util.List;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
-
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class CodegeneratorTests {
@@ -13,4 +10,15 @@ public class CodegeneratorTests {
 //        byte[] resultBytecode = Compiler.generateByteCodeArrayFromTypedAst();
 //        assertEquals(AbstractSyntax_PublicClass.get(), resultBytecode);
 //    }
+
+    @Test
+    public void testMethodCall() {
+        assertDoesNotThrow(() -> {
+            BytecodeTestUtil testUtility = new BytecodeTestUtil("src/test/testFiles/JavaTestfilesFeatures/MethodCall.java", "MethodCall");
+
+            assertEquals(3, testUtility.invokeMethod("method", null));
+            assertEquals(1, testUtility.invokeMethod("method1", new Class<?>[]{int.class}, 1));
+            assertEquals(3, testUtility.invokeMethod("method2", new Class<?>[]{int.class, int.class}, 1, 2));
+        });
+    }
 }