Error Encountered in Cypress: "Tried to wrap warn but it is already wrapped"

Objective: Utilize Cypress and Typescript to test for warnings and errors on the console.

Error Encounter: 

An attempt was made to wrap warn, which is already wrapped
.

Snippet:

  describe.only("Unauthenticated User", () => {
    it("No Console Errors for /", () => {
      cy.visit("/", { 
        onBeforeLoad(win) { cy.spy(win.console, 'error').as('onBeforeLoadSpyWinConsoleError') },
        onLoad(win) { cy.spy(win.console, 'error').as('onLoadSpyWinConsoleError') } 
      });
      cy.get('@onBeforeLoadSpyWinConsoleError').should('have.callCount', 0); 
      cy.get('@onLoadSpyWinConsoleError').should('have.callCount', 0); 
    });
    it("No Console Warns for /", () => {
      cy.visit("/", { 
        onBeforeLoad(win) { cy.spy(win.console, 'warn').as('onBeforeLoadSpyWinConsoleWarn') },
        onLoad(win) { cy.spy(win.console, 'warn').as('onLoadSpyWinConsoleWarn') } 
      });
      cy.get('@onBeforeLoadSpyWinConsoleWarn').should('have.callCount', 0); 
      cy.get('@onLoadSpyWinConsoleWarn').should('have.callCount', 0); 
    });
  });

Can someone provide a solution to rectify this error as well as suggest methods to eliminate code redundancy? Additionally, any recommended resources for further understanding of this issue would be greatly appreciated.

typescriptcypress

Answer №1

Secret agents are the ultimate listeners and will remain undetected throughout the examination. You should be content with utilizing beforeLoad exclusively

  describe.only("Unidentified Individual", () => {
    it("Zero Incidents for /", () => {
      cy.visit("/", { 
        onBeforeLoad(win) { cy.spy(win.console, 'error').as('onBeforeLoadSpyWinConsoleError') },
      });
      cy.get('@onBeforeLoadSpyWinConsoleError').should('have.callCount', 0); 
    });
    it("No Alerts for /", () => {
      cy.visit("/", { 
        onBeforeLoad(win) { cy.spy(win.console, 'warn').as('onBeforeLoadSpyWinConsoleWarn') },
      });
      cy.get('@onBeforeLoadSpyWinConsoleWarn').should('have.callCount', 0); 
    });
  });

Answer №2

I revised the code and streamlined it to only utilize onBeforeLoad() for detecting console errors and warnings.

Here is the custom function I created:

function checkConsole(page: string, type: keyof Console){
  cy.visit(page, { onBeforeLoad(win) { cy.spy(win.console, type).as(type) }});
  cy.get(`@${type}`).should('have.callCount', 0); 
}

This function was incorporated into my tests in the following manner:

  describe("Unauthenticated User", () => {
    it("No Console Errors for /", () => checkConsole("/", "error"));
    it("No Console Warns for /", () => checkConsole("/", "warn"));
  });

This restructuring of the code made it more concise while still ensuring clarity for others.

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