mock $log: fixed bug, added some tests

I extracted mock $log factory into stand alone function, so we can access it and test, because this service is rewritten by real service during testing, so we can't access it through angular.$service('$log')...

src/angular-mocks.js

@@ -241,12 +241,14 @@ angular.service('$exceptionHandler', function(e) {
  *
  * See {@link angular.mock} for more info on angular mocks.
  */
-angular.service('$log', function() {
+angular.service('$log', MockLogFactory);
+
+function MockLogFactory() {
   var $log = {
-    log: function(){ $log.logs.push(arguments); },
-    warn: function(){ $log.logs.push(arguments); },
-    info: function(){ $log.logs.push(arguments); },
-    error: function(){ $log.logs.push(arguments); }
+    log: function(){ $log.log.logs.push(arguments); },
+    warn: function(){ $log.warn.logs.push(arguments); },
+    info: function(){ $log.info.logs.push(arguments); },
+    error: function(){ $log.error.logs.push(arguments); }
   };
 
   $log.log.logs = [];
@@ -255,7 +257,7 @@ angular.service('$log', function() {
   $log.error.logs = [];
 
   return $log;
-});
+}
 
 
 /**

test/angular-mocksSpec.js

@@ -119,3 +119,46 @@ describe('TzDate', function() {
     expect(date2.getUTCSeconds()).toBe(0);
   });
 });
+
+describe('$log', function() {
+  var $log;
+  beforeEach(function() {
+    $log = MockLogFactory();
+  });
+
+  it('should provide log method', function() {
+    expect(function() { $log.log(''); }).not.toThrow();
+  });
+
+  it('should provide info method', function() {
+    expect(function() { $log.info(''); }).not.toThrow();
+  });
+
+  it('should provide warn method', function() {
+    expect(function() { $log.warn(''); }).not.toThrow();
+  });
+
+  it('should provide error method', function() {
+    expect(function() { $log.error(''); }).not.toThrow();
+  });
+
+  it('should store log messages', function() {
+    $log.log('fake log');
+    expect($log.log.logs).toContain(['fake log']);
+  });
+
+  it('should store info messages', function() {
+    $log.info('fake log');
+    expect($log.info.logs).toContain(['fake log']);
+  });
+
+  it('should store warn messages', function() {
+    $log.warn('fake log');
+    expect($log.warn.logs).toContain(['fake log']);
+  });
+
+  it('should store error messages', function() {
+    $log.error('fake log');
+    expect($log.error.logs).toContain(['fake log']);
+  });
+});