test(ui-alerts): migrate old Alert tests

Closes: INSTUI-4187

cypress/component/Alerts.cy.tsx

@@ -0,0 +1,51 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 - present Instructure, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+import React from 'react'
+import { Alert } from '../../packages/ui'
+
+import '../support/component'
+import 'cypress-real-events'
+
+describe('<Alerts/>', () => {
+  it('should have shadow by default', async () => {
+    cy.mount(
+      <Alert variant="info" transition="none">
+        Success: Sample alert text.
+      </Alert>
+    )
+    cy.get('div[class$="-view-alert"]')
+      .should('have.css', 'box-shadow')
+      .and('not.equal', 'none')
+  })
+
+  it("shouldn't have shadow, when `hasShadow` is set to false", async () => {
+    cy.mount(
+      <Alert variant="info" transition="none" hasShadow={false}>
+        Success: Sample alert text.
+      </Alert>
+    )
+
+    cy.get('div[class$="-view-alert"]').should('have.css', 'box-shadow', 'none')
+  })
+})