Provide tests

.env

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+MY_VAR=development-env

.gitignore

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+# deps
+node_modules/

package.json

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+{
+  "name": "hono-env-testing",
+  "scripts": {
+    "dev": "bun run --hot src/index.ts"
+  },
+  "dependencies": {
+    "hono": "^4.6.2"
+  },
+  "devDependencies": {
+    "@types/bun": "latest"
+  }
+}

src/index.test.ts

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+import { describe, expect, it } from 'bun:test';
+import app, { type Environment } from '.';
+
+const MOCK_ENV: Environment = {
+  MY_VAR: 'mocked-env'
+};
+
+describe('Environment', () => {
+  it('Should return environment variables', async () => {
+    const res = await app.request('/env');
+    expect(res.status).toBe(200);
+
+    const env = await res.json();
+    expect(env).toHaveProperty('MY_VAR');
+    expect(env.MY_VAR).toBe(process.env.MY_VAR);
+  });
+
+  it('Should contain overrides from MOCK_ENV', async () => {
+    const res = await app.request('/env', {}, MOCK_ENV);
+    expect(res.status).toBe(200);
+
+    const env = await res.json();
+    expect(env).toHaveProperty('MY_VAR');
+    expect(env.MY_VAR).toBe(MOCK_ENV.MY_VAR);
+  });
+});

src/index.ts

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+import { Hono } from 'hono';
+import { env } from 'hono/adapter';
+
+export interface Environment extends Record<string, string> {
+  MY_VAR: string;
+}
+
+const app = new Hono();
+
+app.get('/env', (c) => c.json(env<Environment>(c)));
+
+export default app;

tsconfig.json

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+{
+  "compilerOptions": {
+    "strict": true,
+    "jsx": "react-jsx",
+    "jsxImportSource": "hono/jsx"
+  }
+}