lh0156 commented on code in PR #22298:
URL: https://github.com/apache/kafka/pull/22298#discussion_r3288100451


##########
clients/src/test/java/org/apache/kafka/common/security/oauthbearer/internals/OAuthBearerScopeClaimUtilsTest.java:
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@@ -0,0 +1,56 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kafka.common.security.oauthbearer.internals;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class OAuthBearerScopeClaimUtilsTest {
+
+    @Test
+    public void testParseSpaceDelimitedScopeClaimSplitsScopeClaim() {
+        assertEquals(List.of("email", "profile", "phone"),
+            OAuthBearerScopeClaimUtils.parseSpaceDelimitedScopeClaim("email 
profile phone"));
+    }
+
+    @Test
+    public void testParseSpaceDelimitedScopeClaimPreservesSingleScope() {
+        assertEquals(List.of("email"),
+            OAuthBearerScopeClaimUtils.parseSpaceDelimitedScopeClaim("email"));
+    }
+
+    @Test
+    public void testParseSpaceDelimitedScopeClaimTrimsClaimBeforeSplitting() {
+        assertEquals(List.of("email", "profile", "phone"),
+            OAuthBearerScopeClaimUtils.parseSpaceDelimitedScopeClaim("  email  
 profile   phone  "));
+    }
+
+    @Test
+    public void testParseSpaceDelimitedScopeClaimDoesNotEmitEmptyScopeItems() {
+        assertEquals(List.of("email", "profile", "phone"),
+            OAuthBearerScopeClaimUtils.parseSpaceDelimitedScopeClaim("email  
profile     phone"));
+    }
+
+    @Test
+    public void 
testParseSpaceDelimitedScopeClaimPreservesBlankClaimForCallerValidation() {
+        assertEquals(List.of("   "), 
OAuthBearerScopeClaimUtils.parseSpaceDelimitedScopeClaim("   "));

Review Comment:
   Thanks for catching this. I verified the RFC 6749 scope grammar and agree 
that a whitespace-only scope claim does not contain any scope-token, so the 
parser should not emit the original blank string as a scope item.
   
   I updated `parseSpaceDelimitedScopeClaim("   ")` to return an empty list and 
adjusted the unit test accordingly. I also kept the secured validator behavior 
explicit: blank string-valued scope claims are still rejected instead of being 
silently treated as a valid no-scope claim.
   
   I also corrected the related test names to reference RFC 6749.



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