fix: add test for reconnect

tests/reconnect_test.ts

@@ -0,0 +1,46 @@
+import { Redis } from "../redis.ts";
+import { assertEquals } from "../vendor/https/deno.land/std/assert/mod.ts";
+import {
+  afterAll,
+  afterEach,
+  beforeAll,
+  beforeEach,
+  describe,
+  it,
+} from "../vendor/https/deno.land/std/testing/bdd.ts";
+import {
+  newClient,
+  nextPort,
+  startRedis,
+  stopRedis,
+  TestServer,
+} from "./test_util.ts";
+
+describe("reconnect", () => {
+  let port!: number;
+  beforeAll(() => {
+    port = nextPort();
+  });
+
+  it("auto reconnect", async () => {
+    let server = await startRedis({ port });
+    const client = await newClient({ hostname: "127.0.0.1", port });
+    assertEquals(await client.ping(), "PONG");
+    await stopRedis(server);
+    server = await startRedis({ port });
+    assertEquals(await client.ping(), "PONG");
+    client.close();
+    await stopRedis(server);
+  });
+
+  it("auto reconnect, with db spec", async () => {
+    let server = await startRedis({ port });
+    const client = await newClient({ hostname: "127.0.0.1", port, db: 1 });
+    assertEquals(await client.ping(), "PONG");
+    await stopRedis(server);
+    server = await startRedis({ port });
+    assertEquals(await client.ping(), "PONG"); //never resolve
+    client.close();
+    await stopRedis(server);
+  });
+});