Only run tests for changed sources

api.js

@@ -13,6 +13,7 @@ var commonPathPrefix = require('common-path-prefix');
 var resolveCwd = require('resolve-cwd');
 var uniqueTempDir = require('unique-temp-dir');
 var findCacheDir = require('find-cache-dir');
+var slash = require('slash');
 var AvaError = require('./lib/ava-error');
 var fork = require('./lib/fork');
 var formatter = require('./lib/enhance-assert').formatter();
@@ -64,6 +65,7 @@ Api.prototype._runFile = function (file) {
 	});
 
 	return fork(file, options)
+		.on('teardown', this._handleTeardown)
 		.on('stats', this._handleStats)
 		.on('test', this._handleTest)
 		.on('unhandledRejections', this._handleRejections)
@@ -96,6 +98,10 @@ Api.prototype._handleExceptions = function (data) {
 	this.errors.push(err);
 };
 
+Api.prototype._handleTeardown = function (data) {
+	this.emit('dependencies', data.file, data.dependencies);
+};
+
 Api.prototype._handleStats = function (stats) {
 	this.testCount += stats.testCount;
 };
@@ -242,10 +248,17 @@ function handlePaths(files, excludePatterns) {
 	return files
 		.map(function (file) {
 			if (fs.statSync(file).isDirectory()) {
-				return handlePaths([path.join(file, '**', '*.js')], excludePatterns);
+				var pattern = path.join(file, '**', '*.js');
+				if (process.platform === 'win32') {
+					// Always use / in patterns, harmonizing matching across platforms.
+					pattern = slash(pattern);
+				}
+				return handlePaths([pattern], excludePatterns);
 			}
 
-			return file;
+			// globby returns slashes even on Windows. Normalize here so the file
+			// paths are consistently platform-accurate as tests are run.
+			return path.normalize(file);
 		})
 		.then(flatten)
 		.filter(function (file) {

cli.js

@@ -29,7 +29,7 @@ var verboseReporter = require('./lib/reporters/verbose');
 var miniReporter = require('./lib/reporters/mini');
 var tapReporter = require('./lib/reporters/tap');
 var Logger = require('./lib/logger');
-var watcher = require('./lib/watcher');
+var Watcher = require('./lib/watcher');
 var Api = require('./api');
 
 // Bluebird specific
@@ -133,7 +133,8 @@ if (files.length === 0) {
 
 if (cli.flags.watch) {
 	try {
-		watcher.start(logger, api, files, arrify(cli.flags.source), process.stdin);
+		var watcher = new Watcher(logger, api, files, arrify(cli.flags.source));
+		watcher.observeStdin(process.stdin);
 	} catch (err) {
 		if (err.name === 'AvaError') {
 			// An AvaError may be thrown if chokidar is not installed. Log it nicely.

lib/test-worker.js

@@ -89,6 +89,17 @@ module.constructor._nodeModulePaths = function () {
 	return ret;
 };
 
+var dependencies = [];
+Object.keys(require.extensions).forEach(function (ext) {
+	var wrappedHandler = require.extensions[ext];
+	require.extensions[ext] = function (module, filename) {
+		if (filename !== testPath) {
+			dependencies.push(filename);
+		}
+		wrappedHandler(module, filename);
+	};
+});
+
 require(testPath);
 
 process.on('uncaughtException', function (exception) {
@@ -122,11 +133,19 @@ process.on('ava-exit', function () {
 	}, delay);
 });
 
+var tearingDown = false;
 process.on('ava-teardown', function () {
+	// ava-teardown can be sent more than once.
+	if (tearingDown) {
+		return;
+	}
+	tearingDown = true;
+
 	var rejections = loudRejection.currentlyUnhandled();
 
 	if (rejections.length === 0) {
-		return exit();
+		exit();
+		return;
 	}
 
 	rejections = rejections.map(function (rejection) {
@@ -142,5 +161,8 @@ process.on('ava-teardown', function () {
 });
 
 function exit() {
-	send('teardown');
+	// Include dependencies in the final teardown message. This ensures the full
+	// set of dependencies is included no matter how the process exits, unless
+	// it flat out crashes.
+	send('teardown', {dependencies: dependencies});
 }