chore(tests): attempt to clean up test flakiness (#3710)

test/automated/api/002_publicstatic.test.js

@@ -0,0 +1,56 @@
+var request = require('supertest');
+request = request('http://127.0.0.1:8080');
+const fs = require('fs');
+const path = require('path');
+const randomString = require('./lib/rand').randomString;
+
+const publicPath = path.resolve(__dirname, '../../../data/public');
+const filename = randomString() + '.txt';
+const fileContent = randomString();
+
+test('random public static file does not exist', async (done) => {
+	request.get('/public/' + filename).expect(404);
+
+	done();
+});
+
+test('public directory is writable', async (done) => {
+	try {
+		writeFileToPublic();
+	} catch (err) {
+		if (err) {
+			if (err.code === 'ENOENT') {
+				// path does not exist
+				fs.mkdirSync(publicPath);
+				writeFileToPublic();
+			} else {
+				throw err;
+			}
+		}
+	}
+
+	done();
+});
+
+test('public static file is accessible', async (done) => {
+	request
+		.get('/public/' + filename)
+		.expect(200)
+		.then((res) => {
+			expect(res.text).toEqual(fileContent);
+			done();
+		});
+});
+
+test('public static file is persistent and not locked', async (done) => {
+	fs.unlink(path.join(publicPath, filename), (err) => {
+		if (err) {
+			throw err;
+		}
+	});
+	done();
+});
+
+function writeFileToPublic() {
+	fs.writeFileSync(path.join(publicPath, filename), fileContent);
+}