feat(mock.$httpBackend): say which request was expected when unexpected request error

Author: vojtajina

src/angular-mocks.js

@@ -631,8 +631,10 @@ angular.module.ngMock.$HttpBackendProvider = function() {
           return method == 'JSONP' ? undefined : xhr;
         }
       }
-      throw wasExpected ? Error('No response defined !') :
-                          Error('Unexpected request: ' + method + ' ' + url);
+      throw wasExpected ?
+          Error('No response defined !') :
+          Error('Unexpected request: ' + method + ' ' + url + '\n' +
+                (expectation ? 'Expected ' + expectation : 'No more request expected'));
     }
 
     $httpBackend.when = function(method, url, data, headers) {

test/angular-mocksSpec.js

@@ -399,7 +399,7 @@ describe('mocks', function() {
       hb.when('GET', '/url1').respond(200, 'content');
       expect(function() {
         hb('GET', '/xxx');
-      }).toThrow('Unexpected request: GET /xxx');
+      }).toThrow('Unexpected request: GET /xxx\nNo more request expected');
     });
 
 
@@ -506,7 +506,7 @@ describe('mocks', function() {
 
       expect(function() {
         hb('GET', '/url2', null, noop, {});
-      }).toThrow('Unexpected request: GET /url2');
+      }).toThrow('Unexpected request: GET /url2\nExpected GET /url1');
     });