Add another test back

packages/sdk-cli/src/models/localRelay/index.test.ts

@@ -0,0 +1,61 @@
+import { instance } from '.';
+import * as relayInfoUtils from './relayInfo';
+import * as launchUtils from './launch';
+import { RELAY_PKG_NAME } from './const';
+
+jest.mock('fs');
+jest.mock('./relayInfo');
+jest.mock('./launch');
+
+describe('instance', () => {
+  it('returns relay info of existing relay instance', async () => {
+    const relayInfo = { port: 1, pid: 1 };
+    (relayInfoUtils.readRelayInfo as jest.Mock).mockResolvedValueOnce(
+      relayInfo,
+    );
+
+    await expect(instance()).resolves.toEqual(relayInfo);
+  });
+
+  it('throws if local relay pkg not installed', async () => {
+    jest
+      .spyOn(relayInfoUtils, 'isRelayPkgInstalled')
+      .mockResolvedValueOnce(false);
+
+    await expect(instance()).rejects.toThrow(
+      `To launch local relay (-l, --local flag), you should have ${RELAY_PKG_NAME} installed. No ${RELAY_PKG_NAME} dependency found in package.json`,
+    );
+  });
+
+  describe('launches relay instance if no existing relay instance', () => {
+    beforeEach(() => {
+      jest
+        .spyOn(relayInfoUtils, 'isRelayPkgInstalled')
+        .mockResolvedValueOnce(true);
+    });
+
+    it('polls and returns launched relay instance info', async () => {
+      const relayInfo = { port: 1, pid: 1 };
+      (relayInfoUtils.readRelayInfo as jest.Mock).mockResolvedValueOnce(false);
+      (relayInfoUtils.pollRelayInfo as jest.Mock).mockResolvedValueOnce(
+        relayInfo,
+      );
+
+      await expect(instance()).resolves.toEqual(relayInfo);
+      // launch() is an empty mock
+      expect(launchUtils.launch).toHaveBeenCalled();
+    });
+
+    it('throws if no launched relay instance info obtained', async () => {
+      (relayInfoUtils.readRelayInfo as jest.Mock).mockResolvedValueOnce(false);
+      (relayInfoUtils.pollRelayInfo as jest.Mock).mockResolvedValueOnce(false);
+
+      await expect(instance()).rejects.toThrow(
+        "Couldn't obtain Local Relay port and pid from PID file",
+      );
+
+      // launch() is an empty mock
+      expect(launchUtils.launch).toHaveBeenCalled();
+    });
+  });
+});