fix: support storybook6 tests

package.json

@@ -24,7 +24,7 @@
     "clean": "git clean -Xdf -e !node_modules -e !node_modules/**",
     "lint": "eslint --ignore-path .gitignore .",
     "readme": "percy-cli-readme",
-    "pretest": "storybook build --config-dir=./test/.storybook --output-dir=./test/.storybook-build --loglevel error",
+    "pretest": "build-storybook --config-dir=./test/.storybook --output-dir=./test/.storybook-build --loglevel error",
     "test": "yarn test:env jasmine --config=./test/jasmine.json",
     "test:env": "cross-env NODE_ENV=test NODE_OPTIONS='--loader=./test/loader.js'",
     "test:coverage": "nyc yarn test"

src/start.js

@@ -32,11 +32,11 @@ export const start = command('start', {
   let { default: { spawn } } = yield import('cross-spawn');
   let { host, port } = flags;
 
-  let args = ['dev', '--ci', `--host=${host}`, `--port=${port}`, ...argv];
-  log.info(`Running "storybook ${args.join(' ')}"`);
+  let args = ['--ci', `--host=${host}`, `--port=${port}`, ...argv];
+  log.info(`Running "start-storybook ${args.join(' ')}"`);
 
   let proc = yield new Promise((resolve, reject) => resolve(
-    spawn('storybook', args, { stdio: 'inherit' }).on('error', reject)
+    spawn('start-storybook', args, { stdio: 'inherit' }).on('error', reject)
   ));
 
   /* istanbul ignore next: this is a storybook flag we don't need to test */

test/.storybook/main.js

@@ -2,9 +2,5 @@ module.exports = {
   stories: ['*.stories.js'],
   features: {
     postcss: false
-  },
-  framework: {
-    name: '@storybook/react-webpack5',
-    options: {}
   }
 };

test/storybook-start.test.js

@@ -27,7 +27,7 @@ describe('percy storybook:start', () => {
     ] : []);
 
     expect(logger.stdout).toEqual(jasmine.arrayContaining([
-      `[percy] Running "storybook dev --ci --host=localhost --port=9000 ${args.join(' ')}"`,
+      `[percy] Running "start-storybook --ci --host=localhost --port=9000 ${args.join(' ')}"`,
       '[percy] Percy has started!',
       '[percy] Snapshot taken: Snapshot: First',
       '[percy] Snapshot taken: Snapshot: Second',
@@ -51,7 +51,7 @@ describe('percy storybook:start', () => {
     await expectAsync(start([...args])).toBeRejectedWithError('FAKE ENOENT');
 
     expect(logger.stdout).toEqual([
-      `[percy] Running "storybook dev --ci --host=localhost --port=9000 ${args.join(' ')}"`
+      `[percy] Running "start-storybook --ci --host=localhost --port=9000 ${args.join(' ')}"`
     ]);
     expect(logger.stderr).toEqual([
       '[percy] Error: FAKE ENOENT'

test/storybook.test.js

@@ -16,8 +16,7 @@ describe('percy storybook', () => {
       default: () => [200, 'text/html', '<p>Not Storybook</p>']
     });
 
-    proc = spawn('storybook', [
-      'dev',
+    proc = spawn('start-storybook', [
       '--config-dir=./test/.storybook',
       '--port=9000',
       '--ci'