Validate that a single library has the same name as the package.

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 d9877eb45de9c678b220df0939f5f386b3590d78..40576ac34ca7ee23a42cca53364a9103441d1008 100644
--- a/utils/tests/pub/validator_test.dart
+++ b/utils/tests/pub/validator_test.dart
@@ -210,7 +210,7 @@ main() {
       run();
     });
 
-    test('has a package name that is a Dart identifier', () {
+    test('has a package name that is a Dart reserved word', () {
       dir(appPath, [libPubspec("operator", "1.0.0")]).scheduleCreate();
       expectValidationError(name);
       run();
@@ -243,7 +243,7 @@ main() {
       run();
     });
 
-    test('has a library name that is a Dart identifier', () {
+    test('has a library name that is a Dart reserved word', () {
       dir(appPath, [
         libPubspec("test_pkg", "1.0.0"),
         dir("lib", [file("operator.dart", "int i = 0;")])
@@ -252,6 +252,15 @@ main() {
       run();
     });
 
+    test('has a single library named differently than the package', () {
+      file(join(appPath, "lib", "test_pkg.dart"), '').scheduleDelete();
+      dir(appPath, [
+        dir("lib", [file("best_pkg.dart", "int i = 0;")])
+      ]).scheduleCreate();
+      expectValidationWarning(name);
+      run();
+    });
+
     test('has no lib directory', () {
       dir(join(appPath, "lib")).scheduleDelete();
       expectValidationError(lib);