extend exit delay on AppVeyor

add small delay on exit from babel
(cherry picked from commit 11961f7)

if AVA is not required in a test, throw an error instead of process.exit

only extend timeout if env.AVA_APPVEYOR is set, so we only slow down
in our tests.

Author: jamestalmage

appveyor.yml

@@ -7,6 +7,7 @@ environment:
 install:
   - ps: Install-Product node $env:nodejs_version
   - set CI=true
+  - set AVA_APPVEYOR=true
   - npm -g install npm@latest || (timeout 30 && npm -g install npm@latest)
   - set PATH=%APPDATA%\npm;%PATH%
   - npm install || (timeout 30 && npm install)

cli.js

@@ -183,7 +183,7 @@ function flushIoAndExit(code) {
 	// timeout required to correctly flush io on Node 0.10 Windows
 	setTimeout(function () {
 		process.exit(code);
-	}, 0);
+	}, process.env.AVA_APPVEYOR ? 500 : 0);
 }
 
 function init(files) {

lib/babel.js

@@ -48,10 +48,7 @@ requireFromString(transpiled.code, testPath, {
 });
 
 if (!avaRequired) {
-	console.error('No tests found in ' + testPath + ', make sure to import "ava" at the top of your test file');
-	setImmediate(function () {
-		process.exit(1);
-	});
+	throw new Error('No tests found in ' + testPath + ', make sure to import "ava" at the top of your test file');
 }
 
 process.on('message', function (message) {
@@ -62,7 +59,9 @@ process.on('message', function (message) {
 });
 
 process.on('ava-kill', function () {
-	process.exit(0);
+	setTimeout(function () {
+		process.exit(0);
+	}, process.env.AVA_APPVEYOR ? 100 : 0);
 });
 
 process.on('ava-cleanup', function () {

test/test.js

@@ -1127,9 +1127,9 @@ test('titles of both passing and failing tests and AssertionErrors are displayed
 test('empty test files creates a failure with a helpful warning', function (t) {
 	t.plan(2);
 
-	execCli('fixture/empty.js', function (err, stdout) {
+	execCli('fixture/empty.js', function (err, stdout, stderr) {
 		t.ok(err);
-		t.ok(/No tests found.*?import "ava"/.test(stdout));
+		t.ok(/No tests found.*?import "ava"/.test(stderr));
 		t.end();
 	});
 });