Storing a variable in Cypress with Typescript for use in the afterEach teardown step

Throughout my test cases, I store data in a variable to be used consistently. The variable maintains its value until the very end of the test, but when trying to access it in the @afterEach teardown function for global clean up, it appears empty. It seems like the variable is unexpectedly reset.

I need the stored data to be accessible even if the test case fails before completion, hence the desire to access it in the teardown phase. How can I ensure the variable retains its value in the Cypress test teardown?

I attempted using a static variable within a class, but that solution did not work as expected.

In each test case, a method stores user data and locks it in a session to prevent interference from parallel running tests until it is released.

class myUser {
  static user;

  public setUser(params: object): void {
    myUser.user = setAndLockUser(params);
  }

  public releaseLockedUser(): void {
    if (myUser.user == undefined) return;
    releaseTheUserLock(myUser.user);
  }
}

At the conclusion of the test case, releasing the user session is essential to make the user available for subsequent test cases. To achieve this, we include releaseUser in the afterEach function:

afterEach(() => {
  myUser.releaseLockedUser();
});

The issue arises when the stored variable is not being recognized correctly during the afterEach teardown. While the user variable is stored successfully throughout the test, it appears empty during the teardown process causing the session clearance to fail.

Answer №1

One approach is to store values in a Cypress environment variable and reset the state using afterEach(). Keep reading for more details.

class myUser {
  public setUser(params: object): void {
    Cypress.env('user', setAndLockUser(params);
  }

  public releaseLockedUser(): void {
    if (Cypress.env('user') {
      releaseTheUserLock(Cypress.env('user'));
    }
  }
}
...
afterEach(() => {
  /**
   * The `.then()` may not always be necessary, but it demonstrates the importance of clearing the environment variable after releasing the locked user.
   */
  myUser.releaseLockedUser().then(() => {
    Cypress.env('user', undefined);
  });
});

Despite valid arguments against using after and afterEach, there are cases where resetting state after test runs is necessary. It's advisable to prioritize before or beforeEach when possible, but don't hesitate to use afterEach() if needed. In certain scenarios, passing the user as an environment variable in the test and checking its lock status in beforeEach() could be sufficient.

describe('some tests', () => {
  beforeEach(() => {
    // Check user lock status and release lock if needed
    releaseTheUserLock();
  });

  it('some test', { env: { user: 'foo' } }, () => {
    // Test scenario using the user
    // Access user with `Cypress.env('user')`
  })
});
...
// Simplify passing environment variable using a function
const user = (user: string) => {
  return { env: { user } };
});
// Usage example
it('some test', user('foo'), () => {});

Answer №2

If you are looking for best practices when it comes to using after or afterEach hooks, please take a look at this resource

One common anti-pattern to avoid is using after or afterEach hooks to clean up state.

This cautionary advice stands true in cases where the test case fails before completion.

Consider providing a specific example of your intentions in order to explore alternative solutions.


Adhering to Cypress guidelines, it is recommended to execute releaseLockedUser() within a beforeEach() instead of an afterEach(), as the latter may not be triggered in case of test failure.

This approach ensures that each test starts with a fresh static user value.

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