Current behavior:

Reading and writing fixtures seems to not work as expected (please let me know if this is my error). Across two different tests (within the same spec) the returned value from cy.fixture is outdated and should have been updated by a previous call to cy.writeFile. This looks to me like a caching issue?

Desired behavior:

It should always return the latest data from the fixture and not something outdated.

Steps to reproduce: (app code and test code)

1. Create a empty spec and paste the below code.
2. Run the spec and see the output in the dashboard.

describe('fixture', () => {
  it('step 1', () => {
    // Create the fixture first
    cy.writeFile("cypress/fixtures/test-temp.json", {
      id: 1,
      name: 'Step 1'
    });

    // Let's see the data, it should be fine
    cy.fixture("test-temp").then(data => cy.log(data));

    // Update the fixture again
    cy.writeFile("cypress/fixtures/test-temp.json", {
      id: 1,
      name: 'Step 2'
    });
  });

  it('step 2', () => {
    // Let's wait 5 seconds just to be sure
    cy.wait(5000);

    // The returned data is { id: 1, name: 'Step 1' }
    // Should be { id: 1, name: 'Step 2' }
    cy.fixture("test-temp").then(data => cy.log(data));
  });
});

Versions

Cypress 3.4.0 & 3.3.2
MacOS Mojave
Chrome 75

UPDATE: No need to create 2 different tests, it also happens inside the very same test.