fix(tests): change how tests are run

Author: baransu

.github/workflows/pipeline.yml

@@ -1,6 +1,9 @@
 name: graphql_ppx_re pipeline
 
 on:
+  pull_request:
+    branches:
+      - master
   push:
     branches-ignore:
       - master

tests_bucklescript/run.js

@@ -4,7 +4,7 @@ function command(cmd) {
   console.log(cmd);
   return new Promise((resolve, reject) => {
     const process = exec(cmd, (error, stdout, stderr) => {
-      if (error) console.warn(error);
+      if (error) reject(error);
       resolve(stdout ? stdout : stderr);
     });
     process.stdout.on("data", function(data) {
@@ -27,7 +27,7 @@ async function test(folder) {
   await command(`cp ./${folder}/* .`);
   await command("npm install");
   await command("npm run test");
-  // await cleanup();
+  await cleanup();
 }
 
 async function run() {