HDFS-13525. RBF: Add unit test TestStateStoreDisabledNameservice. Contributed by Yiqun Lin.

(cherry picked from commit a3b416f69dc3965f247603f657df33bd74fd723e)

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/store/TestStateStoreDisabledNameservice.java

@@ -0,0 +1,71 @@
+/**
+ * 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.hadoop.hdfs.server.federation.store;
+
+import static org.apache.hadoop.hdfs.server.federation.store.FederationStateStoreTestUtils.clearRecords;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.util.Set;
+
+import org.apache.hadoop.hdfs.server.federation.store.records.DisabledNameservice;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Test the basic {@link StateStoreService}
+ * {@link DisabledNameserviceStore} functionality.
+ */
+public class TestStateStoreDisabledNameservice extends TestStateStoreBase {
+
+  private static DisabledNameserviceStore disabledStore;
+
+  @Before
+  public void setup() throws IOException, InterruptedException {
+    disabledStore = getStateStore()
+        .getRegisteredRecordStore(DisabledNameserviceStore.class);
+    // Clear disabled nameservice registrations
+    assertTrue(clearRecords(getStateStore(), DisabledNameservice.class));
+  }
+
+  @Test
+  public void testDisableNameservice() throws IOException {
+    // no nameservices disabled firstly
+    Set<String> disabledNameservices = disabledStore.getDisabledNameservices();
+    assertEquals(0, disabledNameservices.size());
+
+    // disable two nameservices
+    disabledStore.disableNameservice("ns0");
+    disabledStore.disableNameservice("ns1");
+    disabledStore.loadCache(true);
+    // verify if the nameservices are disabled
+    disabledNameservices = disabledStore.getDisabledNameservices();
+    assertEquals(2, disabledNameservices.size());
+    assertTrue(disabledNameservices.contains("ns0")
+        && disabledNameservices.contains("ns1"));
+
+    // enable one nameservice
+    disabledStore.enableNameservice("ns0");
+    disabledStore.loadCache(true);
+    // verify the disabled nameservice again
+    disabledNameservices = disabledStore.getDisabledNameservices();
+    assertEquals(1, disabledNameservices.size());
+    assertTrue(disabledNameservices.contains("ns1"));
+  }
+}