Add method for removing monkey-patched methods

lib/utils/monkey-patches.js

@@ -6,13 +6,30 @@
  * Licensed under the Apache 2.0 license.
 */
 
-/* eslint no-extend-native: 0 */
+/* eslint no-extend-native: 0 key-spacing: 0 */
 
 "use strict";
 
 var max = Math.max,
     min = Math.min;
 
+var originals = {
+  seconds:   Number.prototype.seconds,
+  second:    Number.prototype.second,
+  fromScale: Number.prototype.fromScale,
+  toScale:   Number.prototype.toScale
+};
+
+module.exports.uninstall = function() {
+  for (var opt in originals) {
+    if (originals[opt] == null) {
+      Number.prototype[opt] = originals[opt];
+    } else {
+      delete Number.prototype[opt];
+    }
+  }
+};
+
 module.exports.install = function() {
   // Public: Monkey-patches Number to have Rails-like //seconds() function.
   // Warning, due to the way the Javascript parser works, applying functions on

spec/lib/utils.spec.js

@@ -3,72 +3,6 @@
 var utils = lib("utils");
 
 describe("Utils", function() {
-  describe("Monkey-patches", function() {
-    describe("Number", function() {
-      describe("#seconds", function() {
-        it("allows for expressing time in seconds", function() {
-          expect((5).seconds()).to.be.eql(5000);
-        });
-      });
-
-      describe("#second", function() {
-        it("allows for expressing time in seconds", function() {
-          expect((1).second()).to.be.eql(1000);
-        });
-      });
-
-      describe("#fromScale", function() {
-        it("converts a value from one scale to 0-1 scale", function() {
-          expect((5).fromScale(0, 10)).to.be.eql(0.5);
-        });
-
-        it("converts floats", function() {
-          expect((2.5).fromScale(0, 10)).to.be.eql(0.25);
-        });
-
-        context("if the number goes above the top of the scale", function() {
-          it("should return 1", function() {
-            expect((15).fromScale(0, 10)).to.be.eql(1);
-          });
-        });
-
-        context("if the number goes below the bottom of the scale", function() {
-          it("should return 0", function() {
-            expect((15).fromScale(0, 10)).to.be.eql(1);
-            expect((5).fromScale(10, 20)).to.be.eql(0);
-          });
-        });
-      });
-
-      describe("#toScale", function() {
-        it("converts a value from 0-1 scale to another", function() {
-          expect((0.5).toScale(0, 10)).to.be.eql(5);
-        });
-
-        context("when value goes below bottom of scale", function() {
-          it("returns the bottom of the scale", function() {
-            expect((-5).toScale(0, 10)).to.be.eql(0);
-          });
-        });
-
-        context("when value goes above top of scale", function() {
-          it("returns the top of the scale", function() {
-            expect((15).toScale(0, 10)).to.be.eql(10);
-          });
-        });
-
-        it("converts to floats", function() {
-          expect((0.25).toScale(0, 10)).to.be.eql(2.5);
-        });
-
-        it("can be chained with #fromScale", function() {
-          var num = (5).fromScale(0, 20).toScale(0, 10);
-          expect(num).to.be.eql(2.5);
-        });
-      });
-    });
-  });
-
   describe("#makeUnique", function() {
     it("returns the original name if it's not a conflict", function() {
       var res = utils.makeUnique("hello", ["world"]);

spec/lib/utils/monkey-patches.spec.js

@@ -0,0 +1,112 @@
+// jshint expr:true
+"use strict";
+
+var patches = lib("utils/monkey-patches");
+
+describe("monkey-patches", function() {
+  beforeEach(function() {
+    patches.uninstall();
+  });
+
+  afterEach(function() {
+    patches.install();
+  });
+
+  describe("#install", function() {
+    it("monkey-patches methods onto global classes", function() {
+      var proto = Number.prototype;
+
+      expect(proto.seconds).to.be.undefined;
+      expect(proto.second).to.be.undefined;
+
+      patches.install();
+
+      expect(proto.seconds).to.be.a("function");
+      expect(proto.second).to.be.a("function");
+    });
+  });
+
+  describe("#uninstall", function() {
+    it("removes existing monkey-patching", function() {
+      var proto = Number.prototype;
+
+      patches.install();
+
+      expect(proto.seconds).to.be.a("function");
+      expect(proto.second).to.be.a("function");
+
+      patches.uninstall();
+
+      expect(proto.seconds).to.be.undefined;
+      expect(proto.second).to.be.undefined;
+    });
+  });
+
+  describe("Number", function() {
+    beforeEach(function() {
+      patches.install();
+    });
+
+    describe("#seconds", function() {
+      it("allows for expressing time in seconds", function() {
+        expect((5).seconds()).to.be.eql(5000);
+      });
+    });
+
+    describe("#second", function() {
+      it("allows for expressing time in seconds", function() {
+        expect((1).second()).to.be.eql(1000);
+      });
+    });
+
+    describe("#fromScale", function() {
+      it("converts a value from one scale to 0-1 scale", function() {
+        expect((5).fromScale(0, 10)).to.be.eql(0.5);
+      });
+
+      it("converts floats", function() {
+        expect((2.5).fromScale(0, 10)).to.be.eql(0.25);
+      });
+
+      context("if the number goes above the top of the scale", function() {
+        it("should return 1", function() {
+          expect((15).fromScale(0, 10)).to.be.eql(1);
+        });
+      });
+
+      context("if the number goes below the bottom of the scale", function() {
+        it("should return 0", function() {
+          expect((15).fromScale(0, 10)).to.be.eql(1);
+          expect((5).fromScale(10, 20)).to.be.eql(0);
+        });
+      });
+    });
+
+    describe("#toScale", function() {
+      it("converts a value from 0-1 scale to another", function() {
+        expect((0.5).toScale(0, 10)).to.be.eql(5);
+      });
+
+      context("when value goes below bottom of scale", function() {
+        it("returns the bottom of the scale", function() {
+          expect((-5).toScale(0, 10)).to.be.eql(0);
+        });
+      });
+
+      context("when value goes above top of scale", function() {
+        it("returns the top of the scale", function() {
+          expect((15).toScale(0, 10)).to.be.eql(10);
+        });
+      });
+
+      it("converts to floats", function() {
+        expect((0.25).toScale(0, 10)).to.be.eql(2.5);
+      });
+
+      it("can be chained with #fromScale", function() {
+        var num = (5).fromScale(0, 20).toScale(0, 10);
+        expect(num).to.be.eql(2.5);
+      });
+    });
+  });
+});