diff --git a/packages/api/core/test/fixture/custom_init/index.js b/packages/api/core/test/fixture/custom_init/index.js
index 89d2a174a2..e40fd3316b 100644
--- a/packages/api/core/test/fixture/custom_init/index.js
+++ b/packages/api/core/test/fixture/custom_init/index.js
@@ -1,8 +1,11 @@
+const fs = require('fs-extra');
 const path = require('path');
 
 module.exports = {
   dependencies: ['react'],
   devDependencies: ['react-dom'],
-  templateDirectory: path.resolve(__dirname, './tmpl'),
-  postCopy: (initDir, ora, lintStyle) => {},
+  initializeTemplate: async (directory) => {
+    await fs.copy(path.resolve(__dirname, 'tmpl', '_bar'), path.resolve(directory, '.bar'));
+    await fs.copy(path.resolve(__dirname, 'tmpl', 'src'), path.resolve(directory, 'src'));
+  },
 };
diff --git a/packages/api/core/test/slow/api_spec_slow.ts b/packages/api/core/test/slow/api_spec_slow.ts
index a4b7fe1cde..f9275f6ae8 100644
--- a/packages/api/core/test/slow/api_spec_slow.ts
+++ b/packages/api/core/test/slow/api_spec_slow.ts
@@ -94,6 +94,7 @@ describe(`electron-forge API (with installer=${nodeInstaller})`, () => {
 
     it('should create deep files correctly', async () => {
       await expectProjectPathExists('src/foo.js', 'file');
+      await expectProjectPathExists('src/index.html', 'file');
     });
 
     describe('lint', () => {