test(cli): add tests borrowed from mochajs#4407

Author: manuth

test/integration/fixtures/config/mocharc-extended/base.json

@@ -0,0 +1,6 @@
+{
+  "require": ["foo", "bar"],
+  "bail": true,
+  "reporter": "dot",
+  "slow": 60
+}

test/integration/fixtures/config/mocharc-extended/extends.json

@@ -0,0 +1,3 @@
+{
+  "extends": "./modifiers.json"
+}

test/integration/fixtures/config/mocharc-extended/modifiers.json

@@ -0,0 +1,5 @@
+{
+  "extends": "./base.json",
+  "reporter": "html",
+  "slow": 30
+}

test/integration/options.spec.js

@@ -0,0 +1,23 @@
+'use strict';
+
+var path = require('path');
+var loadOptions = require('../../lib/cli/options').loadOptions;
+
+describe('options', function () {
+  it('Should support extended options', function () {
+    var configDir = path.join(
+      __dirname,
+      'fixtures',
+      'config',
+      'mocharc-extended'
+    );
+    var extended = loadOptions([
+      '--config',
+      path.join(configDir, 'extends.json')
+    ]);
+    expect(extended.require, 'to equal', ['foo', 'bar']);
+    expect(extended.bail, 'to equal', true);
+    expect(extended.reporter, 'to equal', 'html');
+    expect(extended.slow, 'to equal', 30);
+  });
+});