From 912add077989dc06977fe31209d4d8d125bce8d4 Mon Sep 17 00:00:00 2001
From: Jesse Wilson <jesse@swank.ca>
Date: Mon, 14 Mar 2011 22:14:35 +0000
Subject: [PATCH] (Failing) test cases for registering competing types.

---
 .../functional/TypeHierarchyAdapterTest.java  | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/gson/src/test/java/com/google/gson/functional/TypeHierarchyAdapterTest.java b/gson/src/test/java/com/google/gson/functional/TypeHierarchyAdapterTest.java
index ecdd13d9..24ba2241 100644
--- a/gson/src/test/java/com/google/gson/functional/TypeHierarchyAdapterTest.java
+++ b/gson/src/test/java/com/google/gson/functional/TypeHierarchyAdapterTest.java
@@ -23,6 +23,7 @@ import com.google.gson.JsonDeserializer;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
 import com.google.gson.JsonSerializationContext;
 import com.google.gson.JsonSerializer;
 import java.lang.reflect.Type;
@@ -115,6 +116,43 @@ public final class TypeHierarchyAdapterTest extends TestCase {
         ((Manager) company.ceo.minions[2]).minions[1].userid);
   }
 
+  public void testRegisterSubtypeFirst() {
+    Gson gson = new GsonBuilder()
+        .registerTypeHierarchyAdapter(Employee.class, new EmployeeAdapter())
+        .registerTypeHierarchyAdapter(Manager.class, new ManagerAdapter())
+        .create();
+
+    Manager manager = new Manager();
+    manager.userid = "inder";
+
+    String json = gson.toJson(manager, Manager.class);
+    assertEquals("\"inder\"", json);
+    Manager copied = gson.fromJson(json, Manager.class);
+    assertEquals(manager.userid, copied.userid);
+  }
+
+  public void testRegisterSupertypeFirst() {
+    GsonBuilder builder = new GsonBuilder()
+        .registerTypeHierarchyAdapter(Manager.class, new ManagerAdapter())
+        .registerTypeHierarchyAdapter(Employee.class, new EmployeeAdapter());
+    try {
+      builder.create();
+      fail();
+    } catch (IllegalArgumentException expected) {
+    }
+  }
+
+  static class ManagerAdapter implements JsonSerializer<Manager>, JsonDeserializer<Manager> {
+    public Manager deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
+      Manager result = new Manager();
+      result.userid = json.getAsString();
+      return result;
+    }
+    public JsonElement serialize(Manager src, Type typeOfSrc, JsonSerializationContext context) {
+      return new JsonPrimitive(src.userid);
+    }
+  }
+
   static class EmployeeAdapter implements JsonSerializer<Employee>, JsonDeserializer<Employee> {
     public JsonElement serialize(Employee employee, Type typeOfSrc,
         JsonSerializationContext context) {