Prevent suppression of defaults in ava-files (#878)

* fix(cli): Remove default files from CLI

The default files should be in one place (`ava-files.js`).
Right now the defaults provided in `ava-files.js` aren't being used
because the CLI pre-populates them.

Closes #875

* Fixup #876

Author: jamestalmage

cli.js

@@ -165,13 +165,6 @@ api.on('test-run', function (runStatus) {
 });
 
 var files = cli.input.length ? cli.input : arrify(conf.files);
-if (files.length === 0) {
-	files = [
-		'test.js',
-		'test-*.js',
-		'test'
-	];
-}
 
 if (cli.flags.watch) {
 	try {

test/ava-files.js

@@ -1,7 +1,21 @@
 'use strict';
-var test = require('tap').test;
+var path = require('path');
+var tap = require('tap');
+var test = tap.test;
 var AvaFiles = require('../lib/ava-files');
 
+tap.afterEach(function (done) {
+	// We changed the CWD in some of the tests.
+	process.chdir(path.join(__dirname, '..'));
+	done();
+});
+
+function fixture() {
+	var args = Array.prototype.slice.call(arguments);
+	args.unshift(__dirname, 'fixture', 'ava-files');
+	return path.join.apply(path, args);
+}
+
 test('requires new', function (t) {
 	var avaFiles = AvaFiles;
 	t.throws(function () {
@@ -104,3 +118,26 @@ test('findFiles - does not return duplicates of the same file', function (t) {
 		t.end();
 	});
 });
+
+test('findFiles - finds the correct files by default', function (t) {
+	var fixtureDir = fixture('default-patterns');
+	process.chdir(fixtureDir);
+
+	var expected = [
+		'sub/directory/__tests__/foo.js',
+		'sub/directory/bar.test.js',
+		'test-foo.js',
+		'test.js',
+		'test/baz.js',
+		'test/deep/deep.js'
+	].map(function (file) {
+		return path.join(fixtureDir, file);
+	}).sort();
+
+	var avaFiles = new AvaFiles();
+	avaFiles.findTestFiles().then(function (files) {
+		files.sort();
+		t.deepEqual(files, expected);
+		t.end();
+	});
+});

test/fixture/ava-files/default-patterns/sub/directory/__tests__/_foo.js

@@ -0,0 +1 @@
+// empty

test/fixture/ava-files/default-patterns/sub/directory/__tests__/fixtures/foo.js

@@ -0,0 +1 @@
+// empty

test/fixture/ava-files/default-patterns/sub/directory/__tests__/foo.js

@@ -0,0 +1 @@
+// empty

test/fixture/ava-files/default-patterns/sub/directory/__tests__/helpers/foo.js

@@ -0,0 +1 @@
+// empty

test/fixture/ava-files/default-patterns/sub/directory/bar.test.js

@@ -0,0 +1 @@
+// empty

test/fixture/ava-files/default-patterns/test-foo.js

@@ -0,0 +1 @@
+// empty

test/fixture/ava-files/default-patterns/test.js

@@ -0,0 +1 @@
+// empty

test/fixture/ava-files/default-patterns/test/_foo-help.js

@@ -0,0 +1 @@
+// empty