Extract reboot button from reForis.

* Add RebootButton tests.
 * RebootButton code review.
 * Update translations.

src/common/__tests__/RebootButton.test.js

@@ -0,0 +1,55 @@
+/*
+ * 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 from "react";
+
+import { fireEvent, getByText, queryByText, render, wait } from "customTestRender";
+import mockAxios from "jest-mock-axios";
+import { mockJSONError } from "testUtils/network";
+import { mockSetAlert } from "testUtils/alertContextMock";
+
+import { RebootButton } from "../RebootButton";
+
+describe("<RebootButton/>", () => {
+    let componentContainer;
+    beforeEach(() => {
+        const { container } = render(<>
+            <div id="modal-container"/>
+            <RebootButton/>
+        </>);
+        componentContainer = container;
+    });
+
+    it("Render.", () => {
+        expect(componentContainer)
+            .toMatchSnapshot();
+    });
+
+    it("Render modal.", () => {
+        expect(queryByText(componentContainer, "Confirm reboot"))
+            .toBeNull();
+        fireEvent.click(getByText(componentContainer, "Reboot"));
+        expect(componentContainer)
+            .toMatchSnapshot();
+    });
+
+    it("Confirm reboot.", () => {
+        fireEvent.click(getByText(componentContainer, "Reboot"));
+        fireEvent.click(getByText(componentContainer, "Confirm reboot"));
+        expect(mockAxios.post)
+            .toHaveBeenCalledWith("/reforis/api/reboot", undefined, expect.anything());
+    });
+
+    it("Hold error.", async () => {
+        fireEvent.click(getByText(componentContainer, "Reboot"));
+        fireEvent.click(getByText(componentContainer, "Confirm reboot"));
+        mockJSONError();
+        await wait(() => expect(mockSetAlert)
+            .toBeCalledWith("Reboot triggering was failed."));
+    });
+
+});