handle missing package config files (#2158)

Author: jakemac53

pkgs/test_core/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.6.1-wip
+
+- Handle missing package configs.
+
 ## 0.6.0
 
 * Handle paths with leading `/` when spawning test isolates.

pkgs/test_core/lib/src/util/package_config.dart

@@ -29,6 +29,11 @@ Future<Uri> absoluteUri(String path) async {
   final uri = p.toUri(path);
   final absoluteUri =
       uri.isAbsolute ? uri : _originalWorkingDirectory.resolveUri(uri);
-  final packageConfig = await currentPackageConfig;
-  return packageConfig.toPackageUri(absoluteUri) ?? absoluteUri;
+  try {
+    final packageConfig = await currentPackageConfig;
+    return packageConfig.toPackageUri(absoluteUri) ?? absoluteUri;
+  } on StateError catch (_) {
+    // Workaround for a missing package config.
+    return absoluteUri;
+  }
 }

pkgs/test_core/pubspec.yaml

@@ -1,5 +1,5 @@
 name: test_core
-version: 0.6.0
+version: 0.6.1-wip
 description: A basic library for writing tests and running them on the VM.
 repository: https://github.com/dart-lang/test/tree/master/pkgs/test_core