Added test that serialize interfaces.

gson/src/test/java/com/google/gson/functional/InterfaceTest.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2008 Google Inc.
+ *
+ * Licensed 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 com.google.gson.functional;
+
+import com.google.gson.Gson;
+
+import junit.framework.TestCase;
+
+/**
+ * Functional tests involving interfaces.
+ *
+ * @author Inderjeet Singh
+ * @author Joel Leitch
+ */
+public class InterfaceTest extends TestCase {
+  private static final String OBJ_JSON = "{\"someStringValue\":\"StringValue\"}";
+
+  private Gson gson;
+  private TestObject obj;
+
+  protected void setUp() throws Exception {
+    super.setUp();
+    gson = new Gson();
+    obj = new TestObject("StringValue");
+  }
+
+  public void testSerializingObjectImplementingInterface() throws Exception {
+    assertEquals(OBJ_JSON, gson.toJson(obj));
+  }
+  
+  public void testSerializingInterfaceObjectField() throws Exception {
+    TestObjectWrapper objWrapper = new TestObjectWrapper(obj);
+    assertEquals("{\"obj\":" + OBJ_JSON + "}", gson.toJson(objWrapper));
+  }
+
+  private static interface TestObjectInterface {
+    // Holder
+  }
+  
+  private static class TestObject implements TestObjectInterface {
+    @SuppressWarnings("unused")
+    private String someStringValue;
+    
+    private TestObject(String value) {
+      this.someStringValue = value;
+    }
+  }
+
+  private static class TestObjectWrapper {
+    @SuppressWarnings("unused")
+    private TestObjectInterface obj;
+    
+    private TestObjectWrapper(TestObjectInterface obj) {
+      this.obj = obj;
+    }
+  }
+}