Update Cypress test for case 6. (#2284)

* Update Cypress test for case 6.

Dynamically retrieving values for calculating the correctness of scale.

* Apply comments.

Co-authored-by: Kruchinin <dmitryx.kruchinin@intel.com>

tests/cypress/integration/case_6_image_scale_fit.js

@@ -20,6 +20,8 @@ context('Check if the image is scaled and then fitted', () => {
     const posX = 10
     const posY = 10
     const color = 'gray'
+    let scaleBefore = 0
+    let scaleAfter = 0
 
     before(() => {
         cy.visit('auth/login')
@@ -32,17 +34,24 @@ context('Check if the image is scaled and then fitted', () => {
     describe(`Testing "${labelName}"`, () => {
         it('Scale image', () => {
             cy.get('#cvat_canvas_background')
-                .should('have.attr', 'style').and('contain', 'scale(1.05)')
+            .should('have.attr', 'style')
+            .then($styles => {
+                scaleBefore = Number($styles.match(/scale\((\d\.\d+)\)/m)[1])
+            })
             cy.get('.cvat-canvas-container')
-                .trigger('wheel', {deltaY: 5})
+            .trigger('wheel', {deltaY: 5})
             cy.get('#cvat_canvas_background')
-                .should('have.attr', 'style').and('contain', 'scale(0.875)')
+            .should('have.attr', 'style')
+            .then($styles => {
+                scaleAfter = Number($styles.match(/scale\((\d\.\d+)\)/m)[1])
+                cy.expect(scaleBefore).to.be.greaterThan(scaleAfter)
+            })
         })
         it('Fit image', () => {
             cy.get('#cvat_canvas_content')
-                .dblclick()
+            .dblclick()
             cy.get('#cvat_canvas_background')
-                .should('have.attr', 'style').and('contain', 'scale(1.05)')
+            .should('have.attr', 'style').and('contain', scaleBefore)
         })
     })
 })