Add 3 valid and 3 invalid parser tests

syntax/c-style-arrays.invalid.mj

+class CSytleArrays {
+    public int sum(int arr[], int length) {
+           int i = 0;
+           int sum = 0;
+           while (i < length) {
+               sum = sum + arr[i];
+               i = i + 1;
+           }
+           return sum;
+    }
+
+    public static void main(String args[]) {
+
+    }
+}

syntax/hello-world.mj

+class HelloWorld {
+    public static void main(String[] args) {
+        System.out.write(72);
+        System.out.write(101);
+        System.out.write(108);
+        System.out.write(108);
+        System.out.write(111);
+        System.out.write(32);
+        System.out.write(87);
+        System.out.write(111);
+        System.out.write(114);
+        System.out.write(108);
+        System.out.write(100);
+        System.out.write(33);
+        System.out.write(10);
+    }
+}

syntax/inner-class.invalid.mj

+class Outer {
+    class Inner {
+        class InnerInner {
+
+        }
+    }
+}

syntax/receiver-parameter.invalid.mj

+class MyJavaClass {
+
+    public int counter;
+
+    public void dec(MyJavaClass this) {
+        this.counter = this.counter - 1;
+    }
+
+    public static void main(String[] args) {
+        MyJavaClass javaClass = new MyJavaClass();
+        javaClass.counter = 77;
+        System.out.write(javaClass.counter);
+        javaClass.dec();
+        javaClass.dec();
+        javaClass.dec();
+        System.out.write(javaClass.counter);
+    }
+}

syntax/special-method.mj

+class HelloWorld2 {
+    public static void main(String[] args) {
+        System.out.println();
+    }
+}