Updated emtpy_state_spec.js test for jest

Moved file to spec/frontend/environments/ folder.
Modified tests to migrate from karma testing, to jest testing.

spec/frontend/environments/emtpy_state_spec.js

+import { shallowMount } from '@vue/test-utils';
+import EmptyState from '~/environments/components/empty_state.vue';
+
+describe('environments empty state', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = shallowMount(EmptyState, {
+      propsData: {
+        newPath: 'foo',
+        canCreateEnvironment: true,
+        helpPath: 'bar',
+      },
+    });
+  });
+
+  afterEach(() => {
+    vm.destroy();
+  });
+
+  it('renders the empty state', () => {
+    expect(vm.find('.js-blank-state-title').text()).toEqual(
+      "You don't have any environments right now",
+    );
+  });
+
+  it('renders the new environment button', () => {
+    expect(vm.find('.js-new-environment-button').attributes('href')).toEqual('foo');
+  });
+
+  describe('without permission', () => {
+    beforeEach(() => {
+      vm.setProps({ canCreateEnvironment: false });
+    });
+
+    it('does not render the new environment button', () => {
+      expect(vm.find('.js-new-environment-button').exists()).toBe(false);
+    });
+  });
+});

spec/javascripts/environments/emtpy_state_spec.js

-import Vue from 'vue';
-import mountComponent from 'spec/helpers/vue_mount_component_helper';
-import emptyState from '~/environments/components/empty_state.vue';
-
-describe('environments empty state', () => {
-  let vm;
-  let Component;
-
-  beforeEach(() => {
-    Component = Vue.extend(emptyState);
-  });
-
-  afterEach(() => {
-    vm.$destroy();
-  });
-
-  describe('With permissions', () => {
-    beforeEach(() => {
-      vm = mountComponent(Component, {
-        newPath: 'foo',
-        canCreateEnvironment: true,
-        helpPath: 'bar',
-      });
-    });
-
-    it('renders empty state and new environment button', () => {
-      expect(vm.$el.querySelector('.js-blank-state-title').textContent.trim()).toEqual(
-        "You don't have any environments right now",
-      );
-
-      expect(vm.$el.querySelector('.js-new-environment-button').getAttribute('href')).toEqual(
-        'foo',
-      );
-    });
-  });
-
-  describe('Without permission', () => {
-    beforeEach(() => {
-      vm = mountComponent(Component, {
-        newPath: 'foo',
-        canCreateEnvironment: false,
-        helpPath: 'bar',
-      });
-    });
-
-    it('renders empty state without new button', () => {
-      expect(vm.$el.querySelector('.js-blank-state-title').textContent.trim()).toEqual(
-        "You don't have any environments right now",
-      );
-
-      expect(vm.$el.querySelector('.js-new-environment-button')).toBeNull();
-    });
-  });
-});