test(angular.copy): add tests for scenarios when target is missing

test/AngularSpec.js

@@ -31,7 +31,7 @@ describe('angular', function() {
       expect(copy(date) === date).toBeFalsy();
     });
 
-    it("should copy array", function() {
+    it("should deeply copy an array into an existing array", function() {
       var src = [1, {name:"value"}];
       var dst = [{key:"v"}];
       expect(copy(src, dst)).toBe(dst);
@@ -40,14 +40,23 @@ describe('angular', function() {
       expect(dst[1]).not.toBe(src[1]);
     });
 
+    it("should deeply copy an array into a new array", function() {
+      var src = [1, {name:"value"}];
+      var dst = copy(src);
+      expect(src).toEqual([1, {name:"value"}]);
+      expect(dst).toEqual(src);
+      expect(dst).not.toBe(src);
+      expect(dst[1]).not.toBe(src[1]);
+    });
+
     it('should copy empty array', function() {
       var src = [];
       var dst = [{key: "v"}];
       expect(copy(src, dst)).toEqual([]);
       expect(dst).toEqual([]);
     });
 
-    it("should copy object", function() {
+    it("should deeply copy an object into an existing object", function() {
       var src = {a:{name:"value"}};
       var dst = {b:{key:"v"}};
       expect(copy(src, dst)).toBe(dst);
@@ -56,6 +65,16 @@ describe('angular', function() {
       expect(dst.a).not.toBe(src.a);
     });
 
+    it("should deeply copy an object into an existing object", function() {
+      var src = {a:{name:"value"}};
+      var dst = copy(src, dst);
+      expect(src).toEqual({a:{name:"value"}});
+      expect(dst).toEqual(src);
+      expect(dst).not.toBe(src);
+      expect(dst.a).toEqual(src.a);
+      expect(dst.a).not.toBe(src.a);
+    });
+
     it("should copy primitives", function() {
       expect(copy(null)).toEqual(null);
       expect(copy('')).toBe('');