THRIFT-4857: [java] added a unit test for TField
diff --git a/lib/java/test/org/apache/thrift/protocol/TestTField.java b/lib/java/test/org/apache/thrift/protocol/TestTField.java
new file mode 100644
index 0000000..f72c259
--- /dev/null
+++ b/lib/java/test/org/apache/thrift/protocol/TestTField.java
@@ -0,0 +1,60 @@
+/*
+ * 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.thrift.protocol;
+
+import junit.framework.TestCase;
+import static org.junit.Assert.assertNotEquals;
+
+public abstract class TestTField extends TestCase {
+
+  public void testConstructor() {
+    TField uut = new TField();
+    assertEquals("", uut.name);
+    assertEquals(TType.STOP, uut.type);
+    assertEquals(0, uut.id);
+
+    uut = new TField("foo", TType.VOID, (short)42);
+    assertEquals("foo", uut.name);
+    assertEquals(TType.VOID, uut.type);
+    assertEquals(42, uut.id);
+  }
+
+  public void testEquality() {
+    TField uut1 = new TField();
+    TField uut2 = new TField();
+    assertEquals(uut1, uut2);
+    assertEquals(uut1.hashCode(), uut2.hashCode());
+
+    uut1 = new TField("foo", TType.I32, (short)1);
+    uut2 = new TField("foo", TType.I32, (short)2);
+    assertNotEquals(uut1, uut2);
+    assertNotEquals(uut1.hashCode(), uut2.hashCode());
+
+    uut1 = new TField("foo", TType.VOID, (short)1);
+    uut2 = new TField("foo", TType.I32, (short)1);
+    assertNotEquals(uut1, uut2);
+    assertNotEquals(uut1.hashCode(), uut2.hashCode());
+
+    uut1 = new TField("foo", TType.VOID, (short)5);
+    uut2 = new TField("bar", TType.I32, (short)5);
+    assertEquals(uut1, uut2); // name field is ignored
+    assertEquals(uut1.hashCode(), uut2.hashCode());
+  }
+
+}