Resolve "Extract alert context from OpenVPN plugin"

src/alertContext/__tests__/AlertContext.test.js

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2019 CZ.NIC z.s.p.o. (http://www.nic.cz/)
+ *
+ * This is free software, licensed under the GNU General Public License v3.
+ * See /LICENSE for more information.
+ */
+
+import React, { useContext } from "react";
+import { render, getByText, queryByText, fireEvent } from "customTestRender";
+
+import { AlertContext, AlertContextProvider } from "../AlertContext";
+
+function AlertTest() {
+    const setAlert = useContext(AlertContext);
+    return <button onClick={() => setAlert("Alert content")}>Set alert</button>;
+};
+
+describe("AlertContext", () => {
+    let componentContainer;
+
+    beforeEach(() => {
+        const { container } = render(
+            <AlertContextProvider>
+                <AlertTest />
+            </AlertContextProvider>
+        );
+        componentContainer = container;
+    });
+
+    it("should render component without alert", () => {
+        expect(componentContainer).toMatchSnapshot();
+    });
+
+    it("should render alert", () => {
+        fireEvent.click(getByText(componentContainer, "Set alert"));
+        expect(componentContainer).toMatchSnapshot();
+    });
+
+    it("should dismiss alert", () => {
+        fireEvent.click(getByText(componentContainer, "Set alert"));
+        // Alert is present
+        expect(getByText(componentContainer, "Alert content")).toBeDefined();
+
+        fireEvent.click(componentContainer.querySelector(".close"));
+        // Alert is gone
+        expect(queryByText(componentContainer, "Alert content")).toBeNull();
+    });
+});