packages/create-turbo/__tests__/isWritable.test.ts


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import path from "path";
import { isWriteable } from "../src/utils/isWriteable";
import { setupTestFixtures } from "@turbo/test-utils";
import fs from "fs-extra";

describe("isWriteable", () => {
  const { useFixture } = setupTestFixtures({
    directory: path.join(__dirname, "../"),
  });

  it("correctly identifies a writeable directory", async () => {
    const { root } = useFixture({ fixture: `is-writeable` });
    const result = await isWriteable(root);
    expect(result).toEqual(true);
  });

  it("correctly identifies a non-writeable directory", async () => {
    const { root } = useFixture({ fixture: `is-writeable` });
    const result = await isWriteable(path.join(root, "does-not-exist"));
    expect(result).toEqual(false);
  });

  it("returns false on unexpected failure", async () => {
    const { root } = useFixture({ fixture: `is-writeable` });
    const mockFsAccess = jest
      .spyOn(fs, "access")
      .mockRejectedValue(new Error("unknown error"));

    const result = await isWriteable(root);
    expect(result).toEqual(false);
    expect(mockFsAccess).toHaveBeenCalledWith(root, fs.constants.W_OK);

    mockFsAccess.mockRestore();
  });
});