Save exact versions when installing ava@next

Pre-releases may have breaking changes. Users should pin exact versions.

Author: novemberborn

index.js

@@ -53,10 +53,19 @@ module.exports = opts => {
 	const avaTag = next ? 'ava@next' : 'ava';
 
 	if (hasYarn(pkgCwd)) {
-		return execa('yarn', ['add', '--dev', avaTag], {cwd: pkgCwd}).then(post);
+		const yarnArgs = ['add', avaTag, '--dev'];
+		if (next) {
+			yarnArgs.push('--exact');
+		}
+		return execa('yarn', yarnArgs, {cwd: pkgCwd}).then(post);
 	}
 
-	return execa('npm', ['install', '--save-dev', avaTag], {
+	const npmArgs = ['install', '--save-dev'];
+	if (next) {
+		npmArgs.push('--save-exact');
+	}
+	npmArgs.push(avaTag);
+	return execa('npm', npmArgs, {
 		cwd: pkgCwd,
 		stdio: 'inherit'
 	}).then(post);

test.js

@@ -91,15 +91,19 @@ test('installs the AVA dependency', async t => {
 
 	await m({cwd: path.dirname(filepath)});
 
-	t.truthy(get(JSON.parse(fs.readFileSync(filepath, 'utf8')), 'devDependencies.ava'));
+	const installed = get(JSON.parse(fs.readFileSync(filepath, 'utf8')), 'devDependencies.ava');
+	t.truthy(installed);
+	t.regex(installed, /^\^/);
 });
 
 test('installs AVA@next', async t => {
 	const filepath = tempWrite.sync(JSON.stringify({}), 'package.json');
 
 	await m({cwd: path.dirname(filepath), next: true});
 
-	t.truthy(get(JSON.parse(fs.readFileSync(filepath, 'utf8')), 'devDependencies.ava'));
+	const installed = get(JSON.parse(fs.readFileSync(filepath, 'utf8')), 'devDependencies.ava');
+	t.truthy(installed);
+	t.regex(installed, /^\d/);
 });
 
 test('installs via yarn if there\'s a lockfile', async t => {
@@ -110,6 +114,20 @@ test('installs via yarn if there\'s a lockfile', async t => {
 	t.regex(fs.readFileSync(yarnLock, 'utf8'), /ava/);
 });
 
+test('installs AVA@next via yarn if there\'s a lockfile', async t => {
+	const filepath = tempWrite.sync(JSON.stringify({}), 'package.json');
+	const yarnLock = path.join(path.dirname(filepath), 'yarn.lock');
+	fs.writeFileSync(yarnLock, '');
+
+	await m({cwd: path.dirname(yarnLock), next: true});
+
+	t.regex(fs.readFileSync(yarnLock, 'utf8'), /ava/);
+
+	const installed = get(JSON.parse(fs.readFileSync(filepath, 'utf8')), 'devDependencies.ava');
+	t.truthy(installed);
+	t.regex(installed, /^\d/);
+});
+
 test('invokes via cli', async t => {
 	const cliFilepath = path.resolve(__dirname, './cli.js');
 	const filepath = tempWrite.sync(JSON.stringify({}), 'package.json');