Add test for multi-dimensional arrays

tests/integration_test.rs

@@ -147,6 +147,13 @@ fn should_do_arrays_with_longs() {
     assert_eq!(233646220932000, get_long(last_frame_value))
 }
 
+#[test]
+fn should_do_3d_arrays() {
+    let vm = VM::new(vec!["tests/test_data/Array3D.class"], "tests/test_data/std").unwrap();
+    let last_frame_value = vm.run("Array3D").unwrap();
+    assert_eq!(780, get_int(last_frame_value))
+}
+
 #[test]
 fn should_do_class_static_initialization() {
     let vm = VM::new(

tests/test_data/Array3D.java

@@ -0,0 +1,24 @@
+public class Array3D {
+    public static void main(String[] args) {
+        int[][][] array = new int[][][]{
+                {{10, 20}, {30, 40}, {50, 60}},
+                {{70, 80}, {90, 100}, {110, 120}}
+        };
+
+        int result = sum(array);
+    }
+
+    private static int sum(int[][][] array3d) {
+        int sum = 0;
+        for (var array2d : array3d) {
+            for (var array1d: array2d) {
+                for (var value : array1d) {
+                    sum += value;
+                }
+            }
+        }
+
+        return sum;
+    }
+
+}