Axios mocking using jest

client.test.js

const axios = require("axios");
const { fetchData } = require("./server");

jest.mock("axios");

const mockServerErrorResponse = {
  response: {
    status: 500,
    data: "system error",
  },
};
const mockResponse = {
  data: [
    {
      month: "2014-07-01T00:00:00.000",
    },
  ],
};
describe("client test", () => {
  const date = "2014-07-01";
  it("should able to make a call to api with given params", async () => {
    try {
      await fetchData(date);
    } catch (e) {
      // fail("exception occured", e)
    }
    expect(axios).toHaveBeenCalledTimes(1);
    expect(axios).toHaveBeenCalledWith({
      method: "get",
      url: "https://data.lacity.org/resource/trxm-jn3c.json?month=2014-07-01",
    });
  });

  it.only("should return empty array if api returns error", async () => {
    axios.mockReturnValue(Promise.reject(mockServerErrorResponse));
    const errorResponse = await fetchData(date);
    expect(axios).toHaveBeenCalledTimes(1);
    expect(errorResponse).toEqual([]);
  });
  it("should able to return success response", async () => {
    axios.mockReturnValue(Promise.resolve(mockResponse));
    const response = await fetchData(date);
    expect(axios).toHaveBeenCalledTimes(1);
    expect(response).toEqual([{ month: "2014-07-01T00:00:00.000" }]);
  });
});