Add end to end testing example

Does not run in pipeline yet

src/test/java/e2e/EndToEndTest.java

+/*
+ * Queue - A Queueing system that can be used to handle labs in higher education
+ * Copyright (C) 2016-2021  Delft University of Technology
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package e2e;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.TestInstance;
+
+import com.microsoft.playwright.Browser;
+import com.microsoft.playwright.BrowserContext;
+import com.microsoft.playwright.Page;
+import com.microsoft.playwright.Playwright;
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+public abstract class EndToEndTest {
+
+	protected Playwright playwright;
+	protected Browser browser;
+
+	protected BrowserContext context;
+	protected Page page;
+
+	public EndToEndTest() {
+		this.playwright = Playwright.create();
+		this.browser = playwright.webkit().launch();
+	}
+
+	@BeforeEach
+	void createContext() {
+		context = browser.newContext();
+		page = browser.newPage();
+	}
+
+	@AfterAll
+	void close() {
+		playwright.close();
+	}
+
+}