Make pub lish validation gitignore-aware.

test/validator/license_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:path/path.dart' as path;
 import 'package:pub/src/entrypoint.dart';
 import 'package:pub/src/io.dart';
 import 'package:pub/src/validator.dart';
 import 'package:pub/src/validator/license.dart';
 import 'package:scheduled_test/scheduled_test.dart';
@@ skipping 22 matching lines @@
       expectNoValidationError(license);
     });
 
     integration('has a suffixed LICENSE file', () {
       schedule(() => deleteEntry(path.join(sandboxDir, appPath, 'LICENSE')));
       d.file(path.join(appPath, 'LICENSE.md'), '').create();
       expectNoValidationError(license);
     });
   });
 
-  integration('should consider a package invalid if it has no LICENSE file',
-      () {
-    d.validPackage.create();
-    schedule(() => deleteEntry(path.join(sandboxDir, appPath, 'LICENSE')));
-    expectValidationError(license);
+  group('should consider a package invalid if it', () {
+    integration('has no LICENSE file', () {
+      d.validPackage.create();
+      schedule(() => deleteEntry(path.join(sandboxDir, appPath, 'LICENSE')));
+      expectValidationError(license);
+    });
+
+    integration('has a .gitignored LICENSE file', () {
+      var repo = d.git(appPath, [d.file(".gitignore", "LICENSE")]);
+      d.validPackage.create();
+      repo.create();
+      expectValidationError(license);
+    });
   });
 }