From 3932a22cdfb08aea8cd6e81a96cab04f5409ada0 Mon Sep 17 00:00:00 2001
From: Vyacheslav Egorov <me@mrale.ph>
Date: Thu, 15 Feb 2018 16:57:52 +0100
Subject: [PATCH] When running tests with --preview-dart-2 check for
 compilation errors. (#14724)

If compiler failed to produce Kernel binary then compile(...) returns
null to the caller. If we don't check for null we end up trying to
run file called "null" which causes a very confusing crash of the
flutter_tester.
---
 packages/flutter_tools/lib/src/test/flutter_platform.dart | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/packages/flutter_tools/lib/src/test/flutter_platform.dart b/packages/flutter_tools/lib/src/test/flutter_platform.dart
index 1ac38b0cf77..abb4a73e148 100644
--- a/packages/flutter_tools/lib/src/test/flutter_platform.dart
+++ b/packages/flutter_tools/lib/src/test/flutter_platform.dart
@@ -211,6 +211,11 @@ class _FlutterPlatform extends PlatformPlugin {
           packagesPath: PackageMap.globalPackagesPath,
         );
 
+        if (mainDart == null) {
+          controller.sink.addError(_getErrorMessage('Compilation failed', testPath, shellPath));
+          return null;
+        }
+
         // bundlePath needs to point to a folder with `platform.dill` file.
         final Directory tempBundleDirectory = fs.systemTempDirectory
             .createTempSync('flutter_bundle_directory');