wait for forked streams to end before resolving promise

appveyor.yml

@@ -7,9 +7,9 @@ environment:
 install:
   - ps: Install-Product node $env:nodejs_version
   - set CI=true
-  - npm -g install npm@latest
+  - npm -g install npm@latest || (timeout 30 && npm -g install npm@latest)
   - set PATH=%APPDATA%\npm;%PATH%
-  - npm install
+  - npm install || (timeout 30 && npm install)
 matrix:
   fast_finish: true
 build: off
@@ -19,4 +19,4 @@ clone_depth: 1
 test_script:
   - node --version
   - npm --version
-  - npm run test-win
+  - npm run test-win || (timeout 30 && npm run test-win)

lib/babel.js

@@ -46,6 +46,8 @@ if (!avaRequired) {
 
 process.on('message', function (message) {
 	if (message['ava-kill-command']) {
-		process.exit(0);
+		setTimeout(function () {
+			process.exit(0);
+		}, 10);
 	}
 });

lib/fork.js

@@ -67,11 +67,23 @@ module.exports = function (args) {
 		ps.emit('data', data);
 	});
 
-	promise.on = function () {
-		ps.on.apply(ps, arguments);
+	var stdout = new Promise(function (resolve) {
+		ps.stdout.on('end', resolve);
+	});
+
+	var stderr = new Promise(function (resolve) {
+		ps.stderr.on('end', resolve);
+	});
 
+	var endPromise = Promise.all([promise.reflect(), stdout, stderr]).then(function () {
 		return promise;
+	});
+
+	endPromise.on = function () {
+		ps.on.apply(ps, arguments);
+
+		return endPromise;
 	};
 
-	return promise;
+	return endPromise;
 };