Spawn Mocha instead of using its API

.travis.yml

@@ -1,7 +1,6 @@
 sudo: false
 language: node_js
 node_js:
-  - '6'
   - '4'
-  - '0.12'
-  - '0.10'
+  - '6'
+  - '7'

index.js

@@ -1,72 +1,55 @@
 'use strict';
-var domain = require('domain'); // eslint-disable-line no-restricted-modules
-var gutil = require('gulp-util');
-var through = require('through');
-var Mocha = require('mocha');
-var plur = require('plur');
-var reqCwd = require('req-cwd');
 
-module.exports = function (opts) {
-	opts = opts || {};
-
-	var mocha = new Mocha(opts);
-	var cache = {};
-
-	for (var key in require.cache) { // eslint-disable-line guard-for-in
-		cache[key] = true;
-	}
-
-	function clearCache() {
-		for (var key in require.cache) {
-			if (!cache[key] && !/\.node$/.test(key)) {
-				delete require.cache[key];
-			}
-		}
-	}
-
-	if (Array.isArray(opts.require) && opts.require.length) {
-		opts.require.forEach(function (x) {
-			reqCwd(x);
-		});
-	}
-
-	return through(function (file) {
-		mocha.addFile(file.path);
-		this.queue(file);
-	}, function () {
-		var self = this;
-		var d = domain.create();
-		var runner;
-
-		function handleException(err) {
-			if (runner) {
-				runner.uncaught(err);
-			} else {
-				clearCache();
-				self.emit('error', new gutil.PluginError('gulp-mocha', err, {
-					stack: err.stack,
-					showStack: true
-				}));
-			}
-		}
-
-		d.on('error', handleException);
-		d.run(function () {
-			try {
-				runner = mocha.run(function (errCount) {
-					clearCache();
-
-					if (errCount > 0) {
-						self.emit('error', new gutil.PluginError('gulp-mocha', errCount + ' ' + plur('test', errCount) + ' failed.', {
-							showStack: false
-						}));
-					}
-
-					self.emit('end');
-				});
-			} catch (err) {
-				handleException(err);
-			}
-		});
-	});
+const dargs = require('dargs');
+const execa = require('execa');
+const gutil = require('gulp-util');
+const through = require('through2');
+
+module.exports = options => {
+  const defaults = {colors: true, suppress: false};
+
+  options = Object.assign(defaults, options);
+
+  if (Object.prototype.toString.call(options.globals) === '[object Array]') {
+    // typically wouldn't modify passed options, but mocha requires a comma-
+    // separated list of names, http://mochajs.org/#globals-names, whereas dargs
+    // will treat arrays differently.
+    options.globals = options.globals.join(',');
+  }
+
+  // exposing args for testing
+  const args = dargs(options, {excludes: ['suppress'], ignoreFalse: true});
+  const files = [];
+
+  function aggregate(file, encoding, done) {
+    if (file.isNull()) {
+      return done(null, file);
+    }
+
+    if (file.isStream()) {
+      return done(new gutil.PluginError('gulp-mocha', 'Streaming not supported'));
+    }
+
+    files.push(file.path);
+
+    return done();
+  }
+
+  function flush(done) {
+    execa('mocha', files.concat(args))
+      .then(result => {
+        if (!options.suppress) {
+          process.stdout.write(result.stdout);
+        }
+
+        this.emit('result', result);
+        done();
+      })
+      .catch(err => {
+        this.emit('error', new gutil.PluginError('gulp-mocha', err));
+        done();
+      });
+  }
+
+  return through.obj(aggregate, flush);
 };

package.json

@@ -10,7 +10,7 @@
     "url": "sindresorhus.com"
   },
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=4"
   },
   "scripts": {
     "test": "xo && mocha"
@@ -33,12 +33,11 @@
     "tap"
   ],
   "dependencies": {
+    "dargs": "^5.1.0",
+    "execa": "^0.6.0",
     "gulp-util": "^3.0.0",
     "mocha": "^3.0.0",
-    "plur": "^2.1.0",
-    "req-cwd": "^1.0.1",
-    "temp": "^0.8.3",
-    "through": "^2.3.4"
+    "through2": "^2.0.3"
   },
   "devDependencies": {
     "xo": "*"
@@ -47,6 +46,7 @@
     "envs": [
       "node",
       "mocha"
-    ]
+    ],
+    "space": true
   }
 }

readme.md

@@ -26,7 +26,7 @@ $ npm install --save-dev gulp-mocha
 const gulp = require('gulp');
 const mocha = require('gulp-mocha');
 
-gulp.task('default', () => 
+gulp.task('default', () =>
 	gulp.src('test.js', {read: false})
 		// gulp-mocha needs filepaths so you can't have any plugins before it
 		.pipe(mocha({reporter: 'nyan'}))
@@ -42,6 +42,10 @@ gulp.task('default', () =>
 
 #### options
 
+gulp-mocha will pass any options defined directly to the `mocha` binary. That
+means you have every [command line option](http://mochajs.org/#usage) available
+by default. Listed below are some of the more commonly used options:
+
 ##### ui
 
 Type: `string`<br>
@@ -80,12 +84,12 @@ Default: `false`
 
 Bail on the first test failure.
 
-##### ignoreLeaks
+##### checkLeaks
 
 Type: `boolean`<br>
 Default: `false`
 
-Ignore global leaks.
+Check for global variable leaks.
 
 ##### grep
 
@@ -107,7 +111,7 @@ Require custom modules before tests are run.
 If your test suite is not exiting it might be because you still have a lingering callback, most often caused by an open database connection. You should close this connection or do the following:
 
 ```js
-gulp.task('default', () => 
+gulp.task('default', () =>
 	gulp.src('test.js')
 		.pipe(mocha())
 		.once('error', () => {

test/fixtures/fixture-async.js

@@ -3,7 +3,7 @@
 var assert = require('assert');
 
 it('should fail after timeout', function (done) {
-	setTimeout(function () {
-		assert(false);
-	}, 10);
+  setTimeout(function () {
+    assert(false);
+  }, 10);
 });

test/fixtures/fixture-fail.js

@@ -2,5 +2,5 @@
 var assert = require('assert');
 
 it('should fail', function () {
-	assert(false);
+  assert(false);
 });

test/fixtures/fixture-pass.js

@@ -2,5 +2,5 @@
 var assert = require('assert');
 
 it('should pass', function () {
-	assert(true);
+  assert(true);
 });

test/fixtures/fixture-throws-uncaught.js

@@ -2,7 +2,7 @@
 var assert = require('assert');
 
 it('throws after timeout', function (done) {
-	setTimeout(function () {
-		throw new Error('Exception in delayed function');
-	}, 10);
+  setTimeout(function () {
+    throw new Error('Exception in delayed function');
+  }, 10);
 });

test/fixtures/fixture-throws.js

@@ -2,5 +2,5 @@
 var assert = require('assert');
 
 it('contains syntax errors', function () {
-	assert false;
+  assert false;
 });