cosmos-explorer/src/Explorer/Explorer.test.tsx

jest.mock("./../Common/dataAccess/deleteDatabase");
jest.mock("./../Shared/Telemetry/TelemetryProcessor");
import * as ko from "knockout";
import { deleteDatabase } from "./../Common/dataAccess/deleteDatabase";
import * as ViewModels from "./../Contracts/ViewModels";
import Explorer from "./Explorer";

describe("Explorer.isLastDatabase() and Explorer.isLastNonEmptyDatabase()", () => {
  let explorer: Explorer;
  beforeAll(() => {
    (deleteDatabase as jest.Mock).mockResolvedValue(undefined);
  });

  beforeEach(() => {
    explorer = new Explorer();
  });

  it("should be true if only 1 database", () => {
    const database = {} as ViewModels.Database;
    explorer.databases = ko.observableArray<ViewModels.Database>([database]);
    expect(explorer.isLastDatabase()).toBe(true);
  });

  it("should be false if only 2 databases", () => {
    const database = {} as ViewModels.Database;
    const database2 = {} as ViewModels.Database;
    explorer.databases = ko.observableArray<ViewModels.Database>([database, database2]);
    expect(explorer.isLastDatabase()).toBe(false);
  });

  it("should be false if not last empty database", () => {
    const database = {} as ViewModels.Database;
    explorer.databases = ko.observableArray<ViewModels.Database>([database]);
    expect(explorer.isLastNonEmptyDatabase()).toBe(false);
  });

  it("should be true if last non empty database", () => {
    const database = {} as ViewModels.Database;
    database.collections = ko.observableArray<ViewModels.Collection>([{} as ViewModels.Collection]);
    explorer.databases = ko.observableArray<ViewModels.Database>([database]);
    expect(explorer.isLastNonEmptyDatabase()).toBe(true);
  });
});