Add unit test

Author: jdreesen

test/config/parse-runtime.js

@@ -108,6 +108,18 @@ describe('parse-runtime', () => {
         expect(config.babelRcFileExists).to.be.true;
     });
 
+    it('babel.config.json detected when present', () => {
+        const projectDir = createTestDirectory();
+        fs.writeFileSync(
+            path.join(projectDir, 'babel.config.json'),
+            '{}'
+        );
+
+        const config = parseArgv(createArgv(['dev']), projectDir);
+
+        expect(config.babelRcFileExists).to.be.true;
+    });
+
     it('dev-server command hot', () => {
         const testDir = createTestDirectory();
         const config = parseArgv(createArgv(['dev-server', '--hot']), testDir);