feat: update unit test

Signed-off-by: SuZhou-Joe <suzhou@amazon.com>

src/plugins/workspace/public/plugin.test.ts

@@ -0,0 +1,25 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { workspaceClientMock, WorkspaceClientMock } from './workspace_client.mock';
+import { chromeServiceMock, coreMock } from '../../../core/public/mocks';
+import { WorkspacePlugin } from './plugin';
+
+describe('Workspace plugin', () => {
+  const getSetupMock = () => ({
+    ...coreMock.createSetup(),
+    chrome: chromeServiceMock.createSetupContract(),
+  });
+  beforeEach(() => {
+    WorkspaceClientMock.mockClear();
+    Object.values(workspaceClientMock).forEach((item) => item.mockClear());
+  });
+  it('#setup', async () => {
+    const setupMock = getSetupMock();
+    const workspacePlugin = new WorkspacePlugin();
+    await workspacePlugin.setup(setupMock);
+    expect(WorkspaceClientMock).toBeCalledTimes(1);
+  });
+});

src/plugins/workspace/public/plugin.ts

@@ -3,10 +3,13 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { Plugin } from '../../../core/public';
+import { Plugin, CoreSetup } from '../../../core/public';
+import { WorkspaceClient } from './workspace_client';
 
 export class WorkspacePlugin implements Plugin<{}, {}, {}> {
-  public async setup() {
+  public async setup(core: CoreSetup) {
+    const workspaceClient = new WorkspaceClient(core.http, core.workspaces);
+    await workspaceClient.init();
     return {};
   }