webpack-dev-middleware/test/utils/setupOutputFileSystem.test.js at 617da7dddbe2f21fc2166598d86b016a3612ceae · webpack/webpack-dev-middleware · GitHub

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import memfs from "memfs";

import setupOutputFileSystem from "../../src/utils/setupOutputFileSystem";

const createFsFromVolume = jest.spyOn(memfs, "createFsFromVolume");

createFsFromVolume.mockReturnValue({
  testFs: true,
});

describe("setupOutputFileSystem", () => {
  afterEach(() => {
    createFsFromVolume.mockClear();
  });

  it("should create default fs if not provided", () => {
    const context = {
      compiler: { options: {} },
      options: {},
    };

    setupOutputFileSystem(context);

    // make sure that this is the default fs created
    expect(context.compiler.outputFileSystem.testFs).toBeTruthy();
    expect(context.outputFileSystem.testFs).toBeTruthy();
    expect(createFsFromVolume).toHaveBeenCalledTimes(1);
  });

  it("should set fs for multi compiler", () => {
    const context = {
      compiler: {
        compilers: [{ options: {} }, { options: {} }],
      },
      options: {},
    };

    setupOutputFileSystem(context);

    for (const comp of context.compiler.compilers) {
      expect(comp.outputFileSystem).toBeTruthy();
    }
  });

  it("should use provided fs with correct methods", () => {
    const context = {
      compiler: { options: {} },
      options: {
        outputFileSystem: {
          join: () => {},
          mkdirp: () => {},
        },
      },
    };

    setupOutputFileSystem(context);

    expect(context.outputFileSystem).toEqual(context.options.outputFileSystem);
  });
});