Cypress test to check scale and fit image. (#2195)

* Cypress test to check scale and fit image.

* Replace message for context().

* Applying comments.
Co-authored-by: NDmitry Kruchinin <dmitryx.kruchinin@intel.com>

tests/cypress/integration/case_6_image_scale_fit.js

+/*
+ * Copyright (C) 2020 Intel Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/// <reference types="cypress" />
+
+context('Check if the image is scaled and then fitted', () => {
+
+    const caseId = '6'
+    const labelName = `Case ${caseId}`
+    const taskName = `New annotation task for ${labelName}`
+    const attrName = `Attr for ${labelName}`
+    const textDefaultValue = 'Some default value for type Text'
+    const imageFileName = `image_${labelName.replace(' ', '_').toLowerCase()}`
+    const image = `${imageFileName}.png`
+    const width = 800
+    const height = 800
+    const posX = 10
+    const posY = 10
+    const color = 'gray'
+
+    before(() => {
+        cy.visit('auth/login')
+        cy.login()
+        cy.imageGenerator('cypress/fixtures', image, width, height, color, posX, posY, labelName)
+        cy.createAnnotationTask(taskName, labelName, attrName, textDefaultValue, image)
+        cy.openTaskJob(taskName)
+    })
+
+    describe(`Testing "${labelName}"`, () => {
+        it('Scale image', () => {
+            cy.get('#cvat_canvas_background')
+            .should('have.attr', 'style').and('contain', 'scale(1.065)')
+            cy.get('.cvat-canvas-container')
+            .trigger('wheel', {deltaY: 5})
+            cy.get('#cvat_canvas_background')
+            .should('have.attr', 'style').and('contain', 'scale(0.8875)')
+        })
+        it('Fit image', () => {
+            cy.get('#cvat_canvas_content')
+            .dblclick()
+            cy.get('#cvat_canvas_background')
+            .should('have.attr', 'style').and('contain', 'scale(1.065)')
+        })
+    })
+})