diff --git a/mocha/mocha-tests.ts b/mocha/mocha-tests.ts
index 672fac1cb..750a417fe 100644
--- a/mocha/mocha-tests.ts
+++ b/mocha/mocha-tests.ts
@@ -167,3 +167,58 @@ function test_chaining(){
         .reporter('html')
         .reporter(function(){});
 }
+
+import MochaDef = require('mocha');
+
+function test_require_constructor_empty() {
+    var instance = new MochaDef();
+}
+
+function test_require_constructor_noOptions() {
+    var instance = new MochaDef({});
+}
+
+function test_require_constructor_allOptions() {
+    var instance = new MochaDef({
+        grep: /[a-z]*/,
+        ui: 'tdd',
+        reporter: 'dot',
+        timeout: 500,
+        bail: true
+    });
+}
+
+
+function test_require_fluentParams() {
+    var instance = new MochaDef();
+
+    instance.bail(true)
+        .bail()
+        .addFile('foo.js')
+        .reporter('bdd')
+        .ui('dot')
+        .grep('[a-z]*')
+        .grep(/[a-z]*/)
+        .invert()
+        .ignoreLeaks(true)
+        .checkLeaks()
+        .growl()
+        .globals('foo')
+        .globals(['bar', 'zap'])
+        .useColors(true)
+        .useInlineDiffs(true)
+        .timeout(500)
+        .slow(100)
+        .enableTimeouts(true)
+        .asyncOnly(false)
+        .noHighlighting(true)
+        .run();
+}
+
+function test_run_withOnComplete() {
+    var instance = new MochaDef();
+
+    instance.run((failures: any[]): void => {
+        console.log(failures);
+    });
+}
\ No newline at end of file
diff --git a/mocha/mocha.d.ts b/mocha/mocha.d.ts
index 64255a7ba..2e6fa9c58 100644
--- a/mocha/mocha.d.ts
+++ b/mocha/mocha.d.ts
@@ -1,6 +1,6 @@
-// Type definitions for mocha 1.17.1
+// Type definitions for mocha 2.0.1
 // Project: http://visionmedia.github.io/mocha/
-// Definitions by: Kazi Manzur Rashid <https://github.com/kazimanzurrashid/>, otiai10 <https://github.com/otiai10>
+// Definitions by: Kazi Manzur Rashid <https://github.com/kazimanzurrashid/>, otiai10 <https://github.com/otiai10>, jt000 <https://github.com/jt000>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 interface Mocha {
@@ -108,3 +108,40 @@ declare function afterEach(action: (done: MochaDone) => void): void;
 declare function suiteTeardown(action: () => void): void;
 
 declare function suiteTeardown(action: (done: MochaDone) => void): void;
+
+declare module "mocha" {
+
+    class MochaInstance {
+        constructor(options?: {
+            grep?: RegExp;
+            ui?: string;
+            reporter?: string;
+            timeout?: number;
+            bail?: boolean;
+        });
+
+        bail(value?: boolean): MochaInstance;
+        addFile(file: string): MochaInstance;
+        reporter(value: string): MochaInstance;
+        ui(value: string): MochaInstance;
+        grep(value: string): MochaInstance;
+        grep(value: RegExp): MochaInstance;
+        invert(): MochaInstance;
+        ignoreLeaks(value: boolean): MochaInstance;
+        checkLeaks(): MochaInstance;
+        growl(): MochaInstance;
+        globals(value: string): MochaInstance;
+        globals(values: string[]): MochaInstance;
+        useColors(value: boolean): MochaInstance;
+        useInlineDiffs(value: boolean): MochaInstance;
+        timeout(value: number): MochaInstance;
+        slow(value: number): MochaInstance;
+        enableTimeouts(value: boolean): MochaInstance;
+        asyncOnly(value: boolean): MochaInstance;
+        noHighlighting(value: boolean): MochaInstance;
+
+        run(onComplete?: (failures: any[]) => void): void;
+    }
+
+    export = MochaInstance;
+}