adding data collection

test/env.test.js

@@ -0,0 +1,30 @@
+import fs from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { afterEach, describe, expect, it } from 'vitest';
+import { loadEnv } from '../src/env.js';
+
+const loadedKey = 'OPENCODE_PROXY_TEST_ENV_LOADED';
+const existingKey = 'OPENCODE_PROXY_TEST_ENV_EXISTING';
+
+afterEach(() => {
+  delete process.env[loadedKey];
+  delete process.env[existingKey];
+});
+
+describe('.env loading', () => {
+  it('loads values without overriding the process environment', async () => {
+    const directory = await fs.mkdtemp(path.join(os.tmpdir(), 'opencode-proxy-env-'));
+    const envPath = path.join(directory, '.env');
+    await fs.writeFile(envPath, `${loadedKey}=from-file\n${existingKey}=from-file\n`);
+    process.env[existingKey] = 'from-process';
+
+    try {
+      loadEnv(envPath);
+      expect(process.env[loadedKey]).toBe('from-file');
+      expect(process.env[existingKey]).toBe('from-process');
+    } finally {
+      await fs.rm(directory, { recursive: true, force: true });
+    }
+  });
+});