dt-app/lib/src/function/template/function.test.ts

The Dynatrace App Toolkit is a tool you can use from your command line to create, develop, and deploy apps on your Dynatrace environment.

const fetchMock = jest.fn();
globalThis.fetch = fetchMock;

import functionName from './function-name';

describe('function-name', () => {
  it('should return an object with a message property', async () => {
    // An example of how to overwrite the implementation of fetch within a test.
    fetchMock.mockImplementationOnce(() => {
      throw new Error('fetch should not be called in this function');
    });
    const result = await functionName();
    expect(result).toEqual('Hello world');
    expect(fetchMock).not.toHaveBeenCalled();
    expect.assertions(2);
  });
});