minor code style tweaks

cli.js

@@ -182,7 +182,7 @@ function init(files) {
 
 	return handlePaths(files)
 		.map(function (file) {
-			return path.resolve('.', file);
+			return path.resolve(file);
 		})
 		.then(function (files) {
 			if (files.length === 0) {

lib/runner.js

@@ -26,7 +26,6 @@ function Runner(opts) {
 	EventEmitter.call(this);
 
 	this.results = [];
-
 	this.tests = [];
 
 	this.test = makeChain({
@@ -156,17 +155,34 @@ Runner.prototype._addTestResult = function (test) {
 
 Runner.prototype.run = function () {
 	var self = this;
-	var hasExclusive = Boolean(this.select({exclusive: true, skipped: false, type: 'test'}).length);
-	var serial = this.select({exclusive: hasExclusive, skipped: false, serial: true, type: 'test'});
-	var concurrent = this.select({exclusive: hasExclusive, skipped: false, serial: false, type: 'test'});
+
+	var hasExclusive = this.select({
+		exclusive: true,
+		skipped: false,
+		type: 'test'
+	}).length > 0;
+
+	var serial = this.select({
+		exclusive: hasExclusive,
+		skipped: false,
+		serial: true,
+		type: 'test'
+	});
+
+	var concurrent = this.select({
+		exclusive: hasExclusive,
+		skipped: false,
+		serial: false,
+		type: 'test'
+	});
 
 	var stats = this.stats = {
 		failCount: 0,
 		passCount: 0,
 		testCount: serial.length + concurrent.length
 	};
 
-	// Runner is executed directly in tests, in that case process.send() == undefined
+	// Runner is executed directly in tests, in that case `process.send() === undefined`
 	if (process.send) {
 		send('stats', stats);
 	}

lib/test.js

@@ -115,7 +115,8 @@ Test.prototype.run = function () {
 
 	// TODO(vdemedes): refactor this to avoid storing the promise
 	if (!this.fn) {
-		return this.exit();
+		this.exit();
+		return undefined;
 	}
 
 	this._timeStart = globals.now();

test/cli.js

@@ -228,7 +228,7 @@ test('stack traces for exceptions are corrected using a source map, found via a
 test('absolute paths in CLI', function (t) {
 	t.plan(2);
 
-	execCli([path.resolve('.', 'test/fixture/es2015.js')], function (err, stdout, stderr) {
+	execCli([path.resolve('test/fixture/es2015.js')], function (err, stdout, stderr) {
 		t.ifError(err);
 		t.is(stderr.trim(), '1 test passed');
 		t.end();