diff --git a/tests/cypress/integration/case_4_assign_taks_job_users.js b/tests/cypress/integration/case_4_assign_taks_job_users.js
new file mode 100644
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+++ b/tests/cypress/integration/case_4_assign_taks_job_users.js
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2020 Intel Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/// <reference types="cypress" />
+
+context('Multiple users. Assign task, job.', () => {
+    const caseId = '4'
+    const labelName = `Case ${caseId}`
+    const taskName = `New annotation task for ${labelName}`
+    const attrName = `Attr for ${labelName}`
+    const textDefaultValue = 'Some default value for type Text'
+    const image = `image_${labelName.replace(' ', '_').toLowerCase()}.png`
+    const width = 800
+    const height = 800
+    const posX = 10
+    const posY = 10
+    const color = 'gray'
+    const secondUserName = 'Seconduser'
+    const thirdUserName = 'Thirduser'
+
+    const secondUser = {
+        firstName: `${secondUserName} fitstname`,
+        lastName: `${secondUserName} lastname`,
+        emailAddr: `${secondUserName.toLowerCase()}@local.local`,
+        password: 'UfdU21!dds'
+    }
+    const thirdUser = {
+        firstName: `${thirdUserName} fitstname`,
+        lastName: `${thirdUserName} lastname`,
+        emailAddr: `${thirdUserName.toLowerCase()}@local.local`,
+        password: 'Fv5Df3#f55g'
+    }
+
+    function closeModal() {
+        cy.get('.ant-modal-body').within(() => {
+            cy.get('.ant-modal-confirm-title')
+            .should('contain', 'Unsupported platform detected')
+            cy.get('.ant-modal-confirm-btns')
+            .contains('OK')
+            .click()
+        })
+    }
+
+    describe(`Testing case "${caseId}"`, () => {
+        // First user is "admin".
+        it('Register second user and logout.', () => {
+            cy.visit('auth/register')
+            cy.url().should('include', '/auth/register')
+            cy.userRegistration(secondUser.firstName, secondUser.lastName, secondUserName, secondUser.emailAddr, secondUser.password)
+            cy.url().should('include', '/tasks')
+            cy.logout(secondUserName)
+            cy.url().should('include', '/auth/login')
+        })
+        it('Register third user and logout.', () => {
+            cy.visit('auth/register')
+            cy.url().should('include', '/auth/register')
+            if (Cypress.browser.name === 'firefox') {
+                closeModal()
+            }
+            cy.userRegistration(thirdUser.firstName, thirdUser.lastName, thirdUserName, thirdUser.emailAddr, thirdUser.password)
+            cy.url().should('include', '/tasks')
+            cy.logout(thirdUserName)
+            cy.url().should('include', '/auth/login')
+        })
+        it('First user login and create a task', () => {
+            cy.login()
+            cy.url().should('include', '/tasks')
+            cy.imageGenerator('cypress/fixtures', image, width, height, color, posX, posY, labelName)
+            cy.createAnnotationTask(taskName, labelName, attrName, textDefaultValue, image)
+        })
+        it('Assign the task to the second user and logout', () => {
+            cy.openTask(taskName)
+            cy.get('.cvat-task-details').within(() => {
+                cy.get('.cvat-user-selector')
+                .click()
+            })
+            cy.contains(secondUserName)
+            .click()
+            cy.logout()
+        })
+        it('Second user login. The task can be opened. Logout', () => {
+            cy.login(secondUserName, secondUser.password)
+            cy.url().should('include', '/tasks')
+            cy.contains('strong', taskName)
+            .should('exist')
+            cy.openTask(taskName)
+            cy.logout(secondUserName)
+        })
+        it('Third user login. The task not exist. Logout', () => {
+            cy.login(thirdUserName, thirdUser.password)
+            cy.url().should('include', '/tasks')
+            cy.contains('strong', taskName)
+            .should('not.exist')
+            cy.logout(thirdUserName)
+        })
+        it('First user login and assign the job to the third user. Logout', () => {
+            cy.login()
+            cy.url().should('include', '/tasks')
+            cy.openTask(taskName)
+            cy.get('.cvat-task-job-list').within(() => {
+                cy.get('.cvat-user-selector')
+                .click()
+            })
+            cy.contains(thirdUserName)
+            .click()
+            cy.logout()
+        })
+        it('Third user login. The task can be opened.', () => {
+            cy.login(thirdUserName, thirdUser.password)
+            cy.url().should('include', '/tasks')
+            cy.contains('strong', taskName)
+            .should('exist')
+            cy.openTask(taskName)
+        })
+    })
+})