test: should load external module singleton (#635)

Author: 9aoy

e2e/singleton/fixtures/env.d.ts

@@ -0,0 +1 @@
+declare module 'c';

e2e/singleton/fixtures/index.test.ts

@@ -1,4 +1,5 @@
 import { expect, it } from '@rstest/core';
+import { getC } from 'c';
 import { getA } from './a';
 
 it('should singleton A', () => {
@@ -9,3 +10,7 @@ it('should singleton B', async () => {
   const { getB } = await import('./b');
   expect(getB()).toBe(process.env.B);
 });
+
+it('should singleton C', () => {
+  expect(getC()).toBe(process.env.C);
+});

e2e/singleton/fixtures/index1.test.ts

@@ -1,11 +1,12 @@
 import { expect, it } from '@rstest/core';
+import { getC } from 'c';
 import { getA } from './a';
 
-it('should singleton A - 1', () => {
+it('should singleton A', () => {
   expect(getA()).toBe(process.env.A);
 });
 
-it('should singleton B - 2', async () => {
+it('should singleton B', async () => {
   if (process.env.TestNoIsolate) {
     const { getB } = await import('./b');
     expect(getB()).toBe(process.env.B);
@@ -14,7 +15,11 @@ it('should singleton B - 2', async () => {
   }
 });
 
-it('should singleton C', async () => {
+it('should singleton B - 1', async () => {
   const { getB } = await import('./b');
-  expect(getB()).toBe(process.env.C);
+  expect(getB()).toBe(process.env.B1);
+});
+
+it('should singleton C', () => {
+  expect(getC()).toBe(process.env.C);
 });

e2e/singleton/fixtures/setup.ts

@@ -1,16 +1,18 @@
 import { beforeAll } from '@rstest/core';
+import { getC } from 'c';
 import { getA } from './a';
 
 beforeAll(async (context) => {
   const A = getA();
 
   process.env.A = A;
+  process.env.C = getC();
   const { getB } = await import('./b');
 
   const B = getB();
   if (context.filepath.includes('index.test')) {
     process.env.B = B;
   } else {
-    process.env.C = B;
+    process.env.B1 = B;
   }
 });

e2e/singleton/index.test.ts

@@ -1,13 +1,31 @@
 import { dirname, join } from 'node:path';
 import { fileURLToPath } from 'node:url';
-import { describe, it } from '@rstest/core';
+import { beforeAll, describe, it } from '@rstest/core';
+import fs from 'fs-extra';
 import { runRstestCli } from '../scripts/';
 
 const __filename = fileURLToPath(import.meta.url);
 
 const __dirname = dirname(__filename);
 
 describe('test singleton', () => {
+  beforeAll(async () => {
+    fs.ensureDirSync(join(__dirname, 'fixtures', 'node_modules'));
+    fs.writeFileSync(
+      join(__dirname, 'fixtures', 'node_modules', 'c.mjs'),
+      `
+    let c = undefined;
+
+export const getC = () => {
+  if (!c) {
+    c = Math.ceil(Math.random() * 1000).toString();
+  }
+  return c;
+};
+`,
+    );
+  });
+
   it('should load singleton module correctly', async () => {
     const { expectExecSuccess } = await runRstestCli({
       command: 'rstest',