__set__ returns an 'undo' function that when invoked will restore the module to the values it had before it was called

1 files changed, 26 insertions, 3 deletions

diff --git a/test/__set__.test.js b/test/__set__.test.js
index 7b9c2cb..ff1a3d2 100644
--- a/test/__set__.test.js
+++ b/test/__set__.test.js
@@ -69,8 +69,31 @@ describe("__set__", function () {
         expect(moduleFake.getValue()).to.be(2);
         expect(moduleFake.getReference()).to.be(newObj);
     });
-    it("should return undefined", function () {
-        expect(moduleFake.__set__("myValue", 4)).to.be(undefined);
+    it("should return a function that when invoked reverts to the values before set was called", function () {
+        undo = moduleFake.__set__("myValue", 4)
+        expect(typeof undo).to.be("function");
+        expect(moduleFake.getValue()).to.be(4);
+        undo()
+        expect(moduleFake.getValue()).to.be(0);
+    });
+    it("should be able to revert when calling with an env-obj", function () {
+        var newObj = { hello: "hello" };
+
+        expect(moduleFake.getValue()).to.be(0);
+        expect(moduleFake.getReference()).to.eql({});
+
+        var undo = moduleFake.__set__({
+            myValue: 2,
+            myReference: newObj
+        });
+
+        expect(moduleFake.getValue()).to.be(2);
+        expect(moduleFake.getReference()).to.be(newObj);
+
+        undo();
+
+        expect(moduleFake.getValue()).to.be(0);
+        expect(moduleFake.getReference()).to.eql({});
     });
     it("should throw a TypeError when passing misfitting params", function () {
         expect(function () {
@@ -101,4 +124,4 @@ describe("__set__", function () {
             moduleFake.__set__("someVar");  // misfitting number of params
         }).to.throwException(expectTypeError);
     });
-});
\ No newline at end of file
+});