Improve __with__ tests

Author: jhnns

test/__with__.test.js

@@ -1,7 +1,9 @@
 var expect = require("expect.js"),
     __with__ = require("../lib/__with__.js"),
     __set__ = require("../lib/__set__.js"),
-    vm = require("vm");
+    vm = require("vm"),
+
+    expectTypeError = expectError(TypeError);
 
 function expectError(ErrConstructor) {
     return function expectReferenceError(err) {
@@ -41,7 +43,7 @@ describe("__with__", function() {
         })).to.be.a("function");
     });
 
-    it("should return a function that can be invoked with a callback which guarantees __sets__ undo function is called for you at the end", function () {
+    it("should return a function that can be invoked with a callback which guarantees __set__'s undo function is called for you at the end", function () {
         expect(moduleFake.getValue()).to.be(0);
         expect(moduleFake.getReference()).to.eql({});
 
@@ -59,6 +61,24 @@ describe("__with__", function() {
         expect(moduleFake.getReference()).to.eql({});
     });
 
+    it("should also accept a variable name and a variable value (just like __set__)", function () {
+        expect(moduleFake.getValue()).to.be(0);
+
+        moduleFake.__with__("myValue", 2)(function () {
+            expect(moduleFake.getValue()).to.be(2);
+        });
+
+        expect(moduleFake.getValue()).to.be(0);
+
+        expect(moduleFake.getReference()).to.eql({});
+
+        moduleFake.__with__("myReference", newObj)(function () {
+            expect(moduleFake.getReference()).to.be(newObj);
+        });
+
+        expect(moduleFake.getReference()).to.eql({});
+    });
+
     it("should still revert values if the callback throws an exception", function(){
         expect(function withError() {
             moduleFake.__with__({
@@ -86,9 +106,9 @@ describe("__with__", function() {
             };
         }
 
-        expect(callWithFunction(1)).to.throwError();
-        expect(callWithFunction("a string")).to.throwError();
-        expect(callWithFunction({})).to.throwError();
-        expect(callWithFunction(function(){})).to.not.throwError();
+        expect(callWithFunction(1)).to.throwError(expectTypeError);
+        expect(callWithFunction("a string")).to.throwError(expectTypeError);
+        expect(callWithFunction({})).to.throwError(expectTypeError);
+        expect(callWithFunction(function(){})).to.not.throwError(expectTypeError);
     });
 });