Cypress variable and expecting values

user_4619955 0
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Within Cypress I am opening a JSON file and I want to use values within that file to check in a test.

I open the file using cy.readfile() this is my code to read:

 let expectedTimeOfTest = "";
  cy.readFile(filePath + fileName).then((json) => {
  expect(json).to.be.an('object')      
  expectedTimeOfTest = JSON.stringify(json.SEQUENCE.timeoftest);
  cy.log(">>" + expectedTimeOfTest);
});

When I run the test, I can see in the runner that the text appears in the log as I expect.

Now later on I try to assert, I use:

cy.get('.testClass').eq(1).should('have.text', expectedTimeOfTest);

However, the test fails with the error "expected .testClass to be '' but got ''

I cannot see what I have done wrong? Any ideas?

cypress javascript
2 Answers

Depending on where you're executing your assertion, and due to Cypress' asynchronous nature, you may be trying to assert before expectedTimeOfTest is actually being assigned a value. You have one of two options:

  1. Instead of a variable, assign expectedTimeOfTest to an alias: cy.wrap(JSON.stringify(json.SEQUENCE.timeoftest)).as("expectedTimeOfTest"); which you can then access by its alias as either this.expectedTimeOfTest or cy.get("@expectedTimeOfTest") later in your test.

If you go this route, do not use the arrow function for your then method, as aliases won't work with them. Instead use .then(function(){ //your code here})

     // Example of using function() vs arrow function.      
     cy.readFile(filePath + fileName).then(function(json){
        expect(json).to.be.an('object')
        cy.wrap(JSON.stringify(json.SEQUENCE.timeoftest)).as("expectedTimeOfTest");
      });
  1. Include your assertion inside your .then() method.
user_141797760

If you have cy.get('.testClass').eq(1).should('have.text', expectedTimeOfTest); outside of the .then() of cy.readFile(), then it's better to put it inside because cy.readFile() is asynchronous:

cy.readFile(filePath + fileName).then((json) => {
  expect(json).to.be.an('object')      
  expectedTimeOfTest = JSON.stringify(json.SEQUENCE.timeoftest);
  cy.get('.testClass').eq(1).should('have.text', expectedTimeOfTest);
});

You can also use aliases:

cy.readFile(filePath + fileName).as('myFile');

cy.get('@myFile')
user_104019310
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