test: enhance test environment mocking

src/libs/test/getTestEnv.ts

@@ -8,10 +8,12 @@ export function getTestEnvVariables(): Cloudflare.Env {
 export function getTestEnv({
   ADMIN_SDK_JSON = '{"client_email": "test@test.com", "project_id": "test-26g38"}',
   LOG_DB_QUERIES = "false",
+  ...mockEnv
 }: Partial<Cloudflare.Env> = {}): Cloudflare.Env {
   return {
     ...env,
     ADMIN_SDK_JSON,
     LOG_DB_QUERIES,
+    ...mockEnv,
   };
 }