Harden tests (...a bit)

test/apps/common.js

@@ -0,0 +1,42 @@
+const { NODE_ENV, PORT } = process.env;
+
+export const dev = NODE_ENV === 'development';
+
+export function start(app) {
+	const port = parseInt(PORT) || 0;
+
+	app.listen(port, () => {
+		const address = app.server.address();
+
+		process.env.PORT = address.port;
+
+		send({
+			__sapper__: true,
+			event: 'listening',
+			address
+		});
+	});
+}
+
+const properties = ['name', 'message', 'stack', 'code', 'lineNumber', 'fileName'];
+
+function send(message) {
+	process.send && process.send(message);
+}
+
+function send_error(error) {
+	send({
+		__sapper__: true,
+		event: 'error',
+		error: properties.reduce((object, key) => ({...object, [key]: error[key]}), {})
+	})
+}
+
+process.on('unhandledRejection', (reason, p) => {
+	send_error(reason);
+});
+
+process.on('uncaughtException', err => {
+	send_error(err);
+	process.exitCode = 1;
+});