Validate that a package doesn't depend on itself.

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 6f5764a95a4beabf134f6f640d83c019a743f784..1c064bed10dc132682bed064e5de13170051c0e4 100644
--- a/utils/tests/pub/validator_test.dart
+++ b/utils/tests/pub/validator_test.dart
@@ -531,5 +531,17 @@ main() {
         });
       });
     });
+
+    test('has a hosted dependency on itself', () {
+      dir(appPath, [
+        libPubspec("test_pkg", "1.0.0", [
+          {'hosted': {'name': 'test_pkg', 'version': '>=1.0.0'}}
+        ])
+      ]).scheduleCreate();
+
+      expectValidationWarning(dependency);
+
+      run();
+    });
   });
 }