Cypress file uploading error with cypress-file-upload

Question

In my vue/cli 4 / Bootstrap 4.3 app I use vue-upload-component component for files uploading and it works ok. I want to add cypress for testing file uploading and I added https://github.com/abramenal/cypress-file-upload/tree/v3.5.3 into my project, but failed with this testing. I have in vue file:

    <file-upload
            ref="upload"
            v-model="imageFiles"
            post-action="/post.method"
            put-action="/put.method"
            @input-file="inputFile"
            @input-filter="inputFilter"
            :multiple="false"
            class="btn btn-outline-secondary btn-sm m-2 file-input-class"
            data-cy="file-input"
    >
        <i :class="'action_link '+getHeaderIcon('upload')"></i>Upload image
    </file-upload>

    ...
   const VueUploadComponent = require('vue-upload-component')
   Vue.component('file-upload', VueUploadComponent)

and in my browser it is rendered into :

<span class="btn btn-outline-secondary btn-sm m-2 file-input-class file-uploads file-uploads-html5" data-cy="file-input">
    <i class="action_link fa fa-upload"></i>
    Upload image  
    <label for="file"></label> 
    <input type="file" name="file" id="file">
</span>

I cypress test file I do :

        import 'cypress-file-upload'
        describe('Admin category fileupload functionality', () => {
            ...
            const fileName = '/sample_images/sample.png';

            cy.contains('Image Preview/Upload')

            cy.fixture(fileName).then(fileContent => {
                //  cy.find('#file')
                //     .should('have.value', 'Invalid Text')

                console.log('++Inside Tests cy::')
                console.log(cy)

                cy.get('#file').upload({ fileContent, fileName, mimeType: 'image/png' });
            });

But in the console I got error:

THEN function(){}
TypeError: cy.get(...).upload is not a function

I see next ouput of cy var :

Also in testing code above to uncomment 2 lines :

cy.find('#file')
    .should('have.value', 'Invalid Text')

I do not have should errors, as I expected, asnd I do not understand why ?

How to make file uploading testing?

"axios": "^0.19.0",
"cypress-file-upload": "^4.0.6",
"file-saver": "^2.0.2",
"vue": "^2.6.10",
"vue-upload-component": "^2.8.20",

Thanks!

Answer 1

You're showing "^4.0.6" as your cypress-file-upload version. There is a difference between the latest version and version 3.5.3.

The exposed command has changed from upload() to attachFile() since version 4.0.0

There is also a note in the latest version saying it's unstable at the moment. Maybe you should revert back to 3.5.3 and keep your code as is.