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

Author: Kent C. Dodds

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

@@ -104,3 +104,29 @@ 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 avaFiles = new AvaFiles(['**/ava-files/default-patterns/**']);
+	var filesToFind = [
+		'sub/directory/__tests__/foo.js',
+		'sub/directory/bar.test.js',
+		'test-foo.js',
+		'test.js',
+		'test/baz.js'
+	];
+
+	avaFiles.findTestFiles().then(function (files) {
+		var allFilesFound = filesToFind.every(function(fileToFind) {
+			return files.some(function(file) {
+				return endsWith(file, fileToFind)
+			});
+		});
+		t.true(allFilesFound);
+		t.is(files.length, 5);
+		t.end();
+	});
+});
+
+function endsWith(str, suffix) {
+	return str.indexOf(suffix, str.length - suffix.length) !== -1;
+}