Merge pull request #46 from sainthkh/once-methods

fix(sinon-chai): Added once commands for sinon methods

Author: chrisbreiding

lib/sinon-chai.js

@@ -181,7 +181,9 @@
     sinonMethod("calledAfter", "been called after %1");
     sinonMethod("calledOn", "been called with %1 as this", "", ", but it was called with %t instead");
     sinonMethod("calledWith", "been called with arguments %*");
+    sinonMethod("calledOnceWith", "been called exactly once with arguments %*");
     sinonMethod("calledWithExactly", "been called with exact arguments %*");
+    sinonMethod("calledOnceWithExactly", "been called exactly once with exact arguments %*");
     sinonMethod("calledWithMatch", "been called with arguments matching %*");
     sinonMethod("calledImmediatelyBefore", "been called immediately before %1");
     sinonMethod("calledImmediatelyAfter", "been called immediately after %1");