fix leak, add test, for jhnns#33

Author: Trott

lib/rewire.js

@@ -56,7 +56,7 @@ function internalRewire(parentModulePath, targetPath) {
 
     // Check if the module uses the strict mode.
     // If so we must ensure that "use strict"; stays at the beginning of the module.
-    src = fs.readFileSync(targetPath, "utf8");
+    var src = fs.readFileSync(targetPath, "utf8");
     if (detectStrictMode(src) === true) {
         prelude = ' "use strict"; ' + prelude;
     }

test/rewire.test.js

@@ -31,4 +31,10 @@ describe("rewire", function () {
         });
         expect(coffeeModule.readFileSync()).to.be("It works!");
     });
+    it("should keep src variable in function scope", function () {
+        //expect(src).to.be(undefined);
+        // detectStrictMode();
+        // console.dir(global);
+        expect(global.src).to.be(undefined);
+    });
 });