Add a test for EventDeserializer

Change-Id: I11c0c48efcb8a31040c127ebb4b26c19a1f1f4cd

gerrit-server/BUCK

@@ -196,6 +196,7 @@ java_test(
     '//gerrit-server/src/main/prolog:common',
     '//lib:args4j',
     '//lib:grappa',
+    '//lib:gson',
     '//lib:guava',
     '//lib:guava-retrying',
     '//lib:protobuf',

gerrit-server/src/test/java/com/google/gerrit/server/events/EventDeserializerTest.java

@@ -0,0 +1,70 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// 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.gerrit.server.events;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
+import com.google.gerrit.server.data.AccountAttribute;
+import com.google.gerrit.server.data.RefUpdateAttribute;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+import org.junit.Test;
+
+public class EventDeserializerTest {
+
+  @Test
+  public void testRefUpdatedEvent() {
+    RefUpdatedEvent refUpdatedEvent = new RefUpdatedEvent();
+
+    RefUpdateAttribute refUpdatedAttribute = new RefUpdateAttribute();
+    refUpdatedAttribute.refName = "refs/heads/master";
+    refUpdatedEvent.refUpdate = createSupplier(refUpdatedAttribute);
+
+    AccountAttribute accountAttribute = new AccountAttribute();
+    accountAttribute.email = "some.user@domain.com";
+    refUpdatedEvent.submitter = createSupplier(accountAttribute);
+
+    Gson gsonSerializer = new GsonBuilder()
+        .registerTypeAdapter(Supplier.class, new SupplierSerializer()).create();
+    String serializedEvent = gsonSerializer.toJson(refUpdatedEvent);
+
+    Gson gsonDeserializer = new GsonBuilder()
+        .registerTypeAdapter(Event.class, new EventDeserializer())
+        .registerTypeAdapter(Supplier.class, new SupplierDeserializer())
+        .create();
+
+    RefUpdatedEvent e = (RefUpdatedEvent) gsonDeserializer
+        .fromJson(serializedEvent, Event.class);
+
+    assertThat(e).isNotNull();
+    assertThat(e.refUpdate).isInstanceOf(Supplier.class);
+    assertThat(e.refUpdate.get().refName)
+        .isEqualTo(refUpdatedAttribute.refName);
+    assertThat(e.submitter).isInstanceOf(Supplier.class);
+    assertThat(e.submitter.get().email).isEqualTo(accountAttribute.email);
+  }
+
+  private <T> Supplier<T> createSupplier(final T value) {
+    return Suppliers.memoize(new Supplier<T>() {
+      @Override
+      public T get() {
+        return value;
+      }
+    });
+  }
+}