Fix test for skipOnlyOnSpecificRef

Change-Id: I895f9e316674add9419bafed6e41a8cb896d253e
diff --git a/src/test/java/com/googlesource/gerrit/plugins/uploadvalidator/SkipValidationTest.java b/src/test/java/com/googlesource/gerrit/plugins/uploadvalidator/SkipValidationTest.java
index 6a8fda1..3f4276d 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/uploadvalidator/SkipValidationTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/uploadvalidator/SkipValidationTest.java
@@ -122,7 +122,8 @@
             new FakeGroupCacheUUIDByName());
 
     assertThat(
-        validatorConfig.isEnabledForRef(anyUser, projectName,
+        validatorConfig.isEnabledForRef(
+            new FakeUserProvider("testGroup").get(), projectName,
             "refs/heads/myref", "testOp")).isFalse();
   }