add test case for AuthenticationResult (apache#7071)

shardingsphere-proxy/shardingsphere-proxy-frontend/shardingsphere-proxy-frontend-spi/src/test/java/org/apache/shardingsphere/proxy/frontend/engine/AuthenticationResultTest.java

@@ -0,0 +1,53 @@
+/*
+ * 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.shardingsphere.proxy.frontend.engine;
+
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+public final class AuthenticationResultTest {
+
+    @Test
+    public void assertContinuedWithEmpty() {
+        AuthenticationResult actual = AuthenticationResult.continued();
+        assertNull(actual.getUsername());
+        assertNull(actual.getDatabase());
+        assertFalse(actual.isFinished());
+    }
+
+    @Test
+    public void assertContinued() {
+        AuthenticationResult actual = AuthenticationResult.continued("username", "database");
+        assertThat(actual.getUsername(), is("username"));
+        assertThat(actual.getDatabase(), is("database"));
+        assertFalse(actual.isFinished());
+    }
+
+    @Test
+    public void assertFinished() {
+        AuthenticationResult actual = AuthenticationResult.finished("username", "database");
+        assertThat(actual.getUsername(), is("username"));
+        assertThat(actual.getDatabase(), is("database"));
+        assertTrue(actual.isFinished());
+    }
+}