Add a unit test

Author: charlesconnell

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestSaslPropertiesResolver.java

@@ -0,0 +1,49 @@
+package org.apache.hadoop.security;
+
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import javax.security.sasl.Sasl;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import org.apache.hadoop.conf.Configuration;
+
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_RPC_PROTECTION;
+import static org.junit.Assert.assertEquals;
+
+public class TestSaslPropertiesResolver {
+
+  private static final SaslRpcServer.QualityOfProtection PRIVACY_QOP = SaslRpcServer.QualityOfProtection.PRIVACY;
+  private static final SaslRpcServer.QualityOfProtection AUTHENTICATION_QOP = SaslRpcServer.QualityOfProtection.AUTHENTICATION;
+  private static final InetAddress LOCALHOST = new InetSocketAddress("127.0.0.1", 1).getAddress();
+
+  private SaslPropertiesResolver resolver;
+
+  @Before
+  public void setup() {
+    Configuration conf = new Configuration();
+    conf.set(HADOOP_RPC_PROTECTION, "privacy");
+    resolver = new SaslPropertiesResolver();
+    resolver.setConf(conf);
+  }
+
+  @Test
+  public void testResolverDoesNotMutate() {
+    assertEquals(PRIVACY_QOP.getSaslQop(), resolver.getDefaultProperties().get(Sasl.QOP));
+    resolver.getDefaultProperties().put(Sasl.QOP, AUTHENTICATION_QOP.getSaslQop());
+    // Even after changing the map returned by SaslPropertiesResolver, it does not change its future responses
+    assertEquals(PRIVACY_QOP.getSaslQop(), resolver.getDefaultProperties().get(Sasl.QOP));
+
+    assertEquals(PRIVACY_QOP.getSaslQop(), resolver.getClientProperties(LOCALHOST).get(Sasl.QOP));
+    resolver.getDefaultProperties().put(Sasl.QOP, AUTHENTICATION_QOP.getSaslQop());
+    // Even after changing the map returned by SaslPropertiesResolver, it does not change its future responses
+    assertEquals(PRIVACY_QOP.getSaslQop(), resolver.getClientProperties(LOCALHOST).get(Sasl.QOP));
+
+    assertEquals(PRIVACY_QOP.getSaslQop(), resolver.getServerProperties(LOCALHOST).get(Sasl.QOP));
+    resolver.getDefaultProperties().put(Sasl.QOP, AUTHENTICATION_QOP.getSaslQop());
+    // Even after changing the map returned by SaslPropertiesResolver, it does not change its future responses
+    assertEquals(PRIVACY_QOP.getSaslQop(), resolver.getServerProperties(LOCALHOST).get(Sasl.QOP));
+  }
+
+}