add parser tests

syntax/array_access.invalid.mj

+class A {
+    public int a;
+    public void method() {
+        a = array[4][];
+    }
+}
\ No newline at end of file

syntax/different_field_types.mj

+class A {
+    public int field;
+    public CustomType field;
+    public boolean field;
+    public void field;
+    public int[] field;
+    public CustomType[] field;
+    public boolean[] field;
+    public void[][][][][][] field;
+}
\ No newline at end of file

syntax/different_method_types.mj

+class A {
+    public int method() {}
+    public boolean method() {}
+    public void method() {}
+    public CustomType method() {}
+
+    public int[] method() {}
+    public boolean[] method() {}
+    public void[] method() {}
+    public CustomType[] method() {}
+
+    public int[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][] method() {}
+    public boolean[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][] method() {}
+    public void[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][] method() {}
+    public CustomType[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][] method() {}
+
+    public int[] method(int parameter, int parameter, int parameter, int parameter, int parameter, int parameter) {}
+}
\ No newline at end of file

syntax/extra_comma_after_parameters.invalid.mj

+class A {
+    public int[] method(int parameter, int parameter, int parameter, int parameter, int parameter, int parameter,) {}
+}
\ No newline at end of file

syntax/fibonacci.mj

+class FibonacciRecursive {
+    public static void main(String[] args) {
+        int a = 10;
+        int f = fibonacci(a);
+    }
+
+    public int fibonacci(int n) {
+        if(n <= 1) {
+            return n;
+        } else {
+            return fibonacci(n - 1) + fibonacci(n - 2);
+        }
+    }
+}
+

syntax/invalid_class_decl.invalid.mj

+class 42 {
+    public static void main() {
+        int x = 42;
+    }
+}

syntax/missing_parentheses_expression.invalid.mj

+class X {
+    public static void main(String[] args) {
+        int a = 0;
+        int b = 2;
+        int c = 5;
+        int d;
+        d = ((((a + b) * c) - a) / (c % d + ((b - 1) * c));
+    }
+}

syntax/new_array_with_many_brackets.mj

+class A {
+    public type a;
+    public void method() {
+        a = new array[5][][][][][][][][][][][][];
+    }
+}
\ No newline at end of file

syntax/wrong_main_return_type.invalid.java

+class A {
+    public static int main(String[] args) {}
+}
\ No newline at end of file