[FEATURE] Add "test" command

Just some very basic PoC.
Only works with the openui5-sample-app:
https://github.com/SAP/openui5-sample-app

lib/cli/commands/test.js

@@ -0,0 +1,61 @@
+// Test
+
+let test = {
+	command: "test",
+	describe: "TBD"
+};
+
+test.handler = async function(argv) {
+	const karma = require("karma");
+	const normalizer = require("@ui5/project").normalizer;
+	const server = require("@ui5/server").server;
+
+	const tree = await normalizer.generateProjectTree({
+		translator: argv.translator,
+		configPath: argv.config
+	});
+
+	await server.serve(tree, {
+		port: 8080
+	});
+
+	const karmaServer = new karma.Server({
+		basePath: "webapp",
+		frameworks: ["qunit", "openui5"],
+		openui5: {
+			path: "http://localhost:8080/resources/sap-ui-core.js"
+		},
+		client: {
+			openui5: {
+				config: {
+					theme: "sap_belize",
+					language: "EN",
+					bindingSyntax: "complex",
+					compatVersion: "edge",
+					preload: "async",
+					resourceroots: {"sap.ui.demo.todo": "./base"}
+				},
+				tests: [
+					"sap/ui/demo/todo/test/unit/allTests",
+					"sap/ui/demo/todo/test/integration/AllJourneys"
+				]
+			}
+		},
+		files: [
+			{pattern: "**", included: false, served: true, watched: true}
+		],
+		reporters: ["progress"],
+		port: 9876,
+		logLevel: "INFO",
+		browserConsoleLogOptions: {
+			level: "warn"
+		},
+		browsers: ["Chrome"]
+	}, function(exitCode) {
+		console.log("Karma has exited with " + exitCode);
+		process.exit(exitCode);
+	});
+	karmaServer.start();
+};
+
+module.exports = test;