add test for custom formatters

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "lint": "eslint --ext .js .",
     "deploy": "np --skip-cleanup",
-    "test": "mocha ./test/loader.spec.js"
+    "test": "mocha ./test/loader.spec.js --timeout 3000"
   },
   "repository": {
     "type": "git",

test/formatters/simpleFormatter.js

@@ -0,0 +1,12 @@
+'use strict';
+
+function SimpleFormatter() {}
+
+SimpleFormatter.prototype.format = function (failures) {
+  var outputLines = failures.map(function (failure) {
+    return failure.getFailure();
+  });
+  return outputLines.join("\n") + "\n";
+};
+
+module.exports.Formatter = SimpleFormatter;

test/loader.spec.js

@@ -163,4 +163,23 @@ describe('TslintLoader', function() {
       done();
     });
   });
+
+  it('should use custom formatter with custom directory', function(done) {
+    var localConfig = assign({}, webpackConfig, {
+      tslint: {
+        formattersDirectory: 'test/formatters/',
+        formatter: 'simple',
+      }
+    });
+
+    webpack(localConfig, function(err, stats) {
+      if (err) return done(err);
+
+      var result = stats.toJson();
+      expect(result.warnings).to.eql([
+        './test/app/engine.ts\nCalls to \'console.log\' are not allowed.\n'
+      ]);
+      done();
+    });
+  });
 });