CODEWITHSUNDEEP
javascripte2e-testingcypress
J.Long
J.Long

Reputation: 333

How do I store the src of an image and compare it to another image in Cypress?

The test objective is to confirm that an uploaded images 'src' attribute changes if a user uploads a new image, meaning the image has changed.

I've tried to use a couple approaches, outlined below.

First Approach

cy.get('.img').then($img => {
      //store the src

      const source = $('img').attr('src');

      /**
       * File drop 2mb jpg
       */
      cy.fixture(Cypress.env("JPG_2MB_ASSET"), "base64").then(fileContent => {
        cy.get(".dropzone").upload(
          {
            fileContent,
            fileName: "sampleimage.jpg",
            mimeType: "image/jpeg"
          },
          { subjectType: "drag-n-drop" }
        );
      });
      cy.wait(16000);

      cy.get('img')
        .attr('src')
        .should($src2 => {
          expect($src2).not.to.eq(source);
        });

Second Approach

      //store the src

      const source = $img.attr('src')

      /**
       * File drop 2mb jpg
       */
      cy.fixture(Cypress.env("JPG_2MB"), "base64").then(fileContent => {
        cy.get(".dropzone").upload(
          {
            fileContent,
            fileName: "sampleimage.jpg",
            mimeType: "image/jpeg"
          },
          { subjectType: "drag-n-drop" }
        );
      });
      cy.wait(16000);

      cy.get("img").attr('src').should(($src2) => {
        expect($src2).not.to.eq(source)

Third Approach

    cy.get("img")
      .attr("src")
      .then($src1 => {
        /**
         * File drop 2mb jpg
         */
        cy.fixture(Cypress.env("JPG_2MB"), "base64").then(fileContent => {
          cy.get(".dropzone").upload(
            {
              fileContent,
              fileName: "sampleimage.jpg",
              mimeType: "image/jpeg"
            },
            { subjectType: "drag-n-drop" }
          );
        });
        cy.wait(16000);

        cy.get('img')
          .attr('src')
          .should($src2 => {
            expect($src2).not.to.eq($src1);
          });

The uploads work great, but the comparison of the src does not.

First & Second Approach

Expected- it stores the first image's src as the const source, and it drops a 2mb jpg. It then compares the 2nd image's src to the first and confirm they are different.

Result- ReferenceError: $ is not defined

Third Approach

Expected- It stores the first src as $src1, and then compares it to the second src, $src2

Result- cy.get(...).attr is not a function

Upvotes: 4

Views: 7426

Answers (1)

J.Long
J.Long

Reputation: 333

After a plentitude of being angry at my keyboard, I have found the winning solution.

Using invoke you can store the value of an attr like src, as shown here: https://docs.cypress.io/api/commands/invoke.html#Arguments-are-automatically-forwarded-to-the-function

So, after a few tweaks to the above attempts, I found this to work perfectly:

    cy.get('.image-root img').invoke('attr', 'src').then((firstSrc) => {
      const src1 = firstSrc

        /**
         * File drop 2mb jpg
         */
        cy.fixture(Cypress.env("JPG_2MB"), "base64").then(fileContent => {
          cy.get(".dropzone").upload(
            {
              fileContent,
              fileName: "sampleimage.jpg",
              mimeType: "image/jpeg"
            },
            { subjectType: "drag-n-drop" }
          );
        });

        cy.wait(16000);

      cy.get('.image-root img').invoke('attr', 'src').then((nextSrc) => {
        expect(nextSrc).to.not.equal(src1)
      });
    });

Upvotes: 8

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