test(auth): add unit tests for ltProxyAuth and ltProxyHandler

- Add tests to validate ltProxyAuth behavior for valid, invalid, and missing API keys
- Add tests to verify ltProxyHandler correctly proxies requests and returns responses

src/__tests__/ltProxyAuth.test.ts

@@ -0,0 +1,63 @@
+// deno-lint-ignore-file require-await
+import { assertEquals } from 'https://deno.land/std@0.204.0/assert/mod.ts';
+import type { IContext } from 'http-kernel/Interfaces/mod.ts';
+import { ltProxyAuth } from '../ltProxyAuth.ts';
+
+Deno.test('ltProxyAuth: accepts valid API key', async () => {
+    Deno.env.set('API_KEYS', 'valid123');
+
+    const req = new Request('http://localhost/?apiKey=valid123');
+    const ctx: IContext = {
+        req,
+        params: {},
+        query: { apiKey: 'valid123' },
+        state: {},
+    };
+
+    const response = await ltProxyAuth(
+        ctx,
+        async () => new Response('OK', { status: 200 }),
+    );
+
+    assertEquals(response.status, 200);
+    assertEquals(await response.text(), 'OK');
+});
+
+Deno.test('ltProxyAuth: rejects invalid API key', async () => {
+    Deno.env.set('API_KEYS', 'valid123');
+
+    const req = new Request('http://localhost/?apiKey=invalid456');
+    const ctx: IContext = {
+        req,
+        params: {},
+        query: { apiKey: 'invalid456' },
+        state: {},
+    };
+
+    const response = await ltProxyAuth(
+        ctx,
+        async () => new Response('SHOULD NOT HAPPEN'),
+    );
+
+    assertEquals(response.status, 403);
+    assertEquals(await response.text(), 'Forbidden – Invalid API key');
+});
+
+Deno.test('ltProxyAuth: rejects missing API key', async () => {
+    Deno.env.set('API_KEYS', 'valid123');
+
+    const req = new Request('http://localhost/');
+    const ctx: IContext = {
+        req,
+        params: {},
+        query: {},
+        state: {},
+    };
+
+    const response = await ltProxyAuth(
+        ctx,
+        async () => new Response('SHOULD NOT HAPPEN'),
+    );
+
+    assertEquals(response.status, 403);
+});