Make sure package names are URL encoded.

utils/tests/pub/validator_test.dart

Index: utils/tests/pub/validator_test.dart
diff --git a/utils/tests/pub/validator_test.dart b/utils/tests/pub/validator_test.dart
index 77d9c8652ef08bd19a26fc169f951072c3b4f1bf..4f59bbae58ffb211043970c9a05435e5d2452e92 100644
--- a/utils/tests/pub/validator_test.dart
+++ b/utils/tests/pub/validator_test.dart
@@ -284,12 +284,12 @@ main() {
 
     integration('has a package name with an invalid character', () {
       dir(appPath, [libPubspec("test-pkg", "1.0.0")]).scheduleCreate();
-      expectValidationWarning(name);
+      expectValidationError(name);
     });
 
     integration('has a package name that begins with a number', () {
       dir(appPath, [libPubspec("8ball", "1.0.0")]).scheduleCreate();
-      expectValidationWarning(name);
+      expectValidationError(name);
     });
 
     integration('has a package name that contains upper-case letters', () {