Merge pull request #528 from wbyoung/throw-super-overwrite-method

Throw when calling _super on overwriteMethod if method is undefined
chaijs · Oct 4, 2015 · c772b42 · c772b42
2 parents ac78e36 + 2f4cd16
commit c772b42
Show file tree

Hide file tree

Showing 2 changed files with 21 additions and 2 deletions.
diff --git a/lib/chai/utils/overwriteMethod.js b/lib/chai/utils/overwriteMethod.js
@@ -39,7 +39,9 @@
 
 module.exports = function (ctx, name, method) {
   var _method = ctx[name]
-    , _super = function () { return this; };
+    , _super = function () {
+      throw new Error(name + ' is not a function');
+    };
 
   if (_method && 'function' === typeof _method)
     _super = _method;

diff --git a/test/utilities.js b/test/utilities.js
@@ -259,13 +259,30 @@ describe('utilities', function () {
         expect(_super).to.be.a('function');
         return function () {
           _.flag(this, 'doesnt', true);
-          _super.apply(this, arguments);
         }
       });
     });
 
     var dne = expect('something').to.doesnotexist();
     expect(dne.__flags).to.have.property('doesnt');
+
+    chai.use(function (_chai, _) {
+      expect(_chai.Assertion).to.not.respondTo('doesnotexistfail');
+      _chai.Assertion.overwriteMethod('doesnotexistfail', function (_super) {
+        expect(_super).to.be.a('function');
+        return function () {
+          _.flag(this, 'doesnt', true);
+          _super.apply(this, arguments);
+        }
+      });
+    });
+
+    var dneFail = expect('something');
+    var dneError;
+    try { dneFail.to.doesnotexistfail(); }
+    catch (e) { dneError = e; }
+    expect(dneFail.__flags).to.have.property('doesnt');
+    expect(dneError.message).to.eql('doesnotexistfail is not a function');
   });
 
   it('overwriteMethod returning result', function () {