Sync registrar to Braintree customer record automatically

In order to set the customerId field on a payment, the customer entry
must exist in Braintree's database. This CL causes it to be created or
updated before processing the payment.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=118530040

javatests/com/google/domain/registry/testing/ReflectiveFieldExtractor.java

@@ -0,0 +1,37 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// 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.domain.registry.testing;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import java.lang.reflect.Field;
+
+/** Utility class for extracting encapsulated contents of objects for testing. */
+public final class ReflectiveFieldExtractor {
+
+  /** Extracts private {@code fieldName} on {@code object} without public getter. */
+  public static <T> T extractField(Class<T> returnType, Object object, String fieldName)
+      throws NoSuchFieldException, SecurityException, IllegalAccessException {
+    Field field = object.getClass().getDeclaredField(fieldName);
+    field.setAccessible(true);
+    Object value = field.get(object);
+    checkArgument(value == null || returnType.isInstance(value));
+    @SuppressWarnings("unchecked")
+    T result = (T) value;
+    return result;
+  }
+
+  private ReflectiveFieldExtractor() {}
+}

javatests/com/google/domain/registry/ui/server/registrar/BUILD

@@ -13,6 +13,7 @@ java_library(
         "//java/com/google/common/io",
         "//java/com/google/common/net",
         "//java/com/google/common/testing",
+        "//java/com/google/domain/registry/braintree",
         "//java/com/google/domain/registry/config",
         "//java/com/google/domain/registry/export/sheet",
         "//java/com/google/domain/registry/model",

javatests/com/google/domain/registry/ui/server/registrar/RegistrarPaymentActionTest.java

@@ -14,8 +14,8 @@
 
 package com.google.domain.registry.ui.server.registrar;
 
-import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.domain.registry.testing.ReflectiveFieldExtractor.extractField;
 import static java.util.Arrays.asList;
 import static org.mockito.Matchers.any;
 import static org.mockito.Mockito.verify;
@@ -45,7 +45,6 @@ import org.mockito.Captor;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
 
-import java.lang.reflect.Field;
 import java.math.BigDecimal;
 
 /** Tests for {@link RegistrarPaymentAction}. */
@@ -444,14 +443,4 @@ public class RegistrarPaymentActionTest {
             "field", "amount",
             "results", asList());
   }
-
-  @SuppressWarnings("unchecked")
-  private static <T> T extractField(Class<T> returnType, Object object, String fieldName)
-      throws NoSuchFieldException, SecurityException, IllegalAccessException {
-    Field field = object.getClass().getDeclaredField(fieldName);
-    field.setAccessible(true);
-    Object value = field.get(object);
-    checkArgument(returnType.isInstance(value));
-    return (T) value;
-  }
 }

javatests/com/google/domain/registry/ui/server/registrar/RegistrarPaymentSetupActionTest.java

@@ -16,9 +16,12 @@ package com.google.domain.registry.ui.server.registrar;
 
 import static com.google.common.truth.Truth.assertThat;
 import static java.util.Arrays.asList;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import com.google.common.collect.ImmutableMap;
+import com.google.domain.registry.braintree.BraintreeRegistrarSyncer;
 import com.google.domain.registry.config.RegistryEnvironment;
 import com.google.domain.registry.model.registrar.Registrar;
 import com.google.domain.registry.testing.AppEngineRule;
@@ -49,11 +52,15 @@ public class RegistrarPaymentSetupActionTest {
   @Mock
   private ClientTokenGateway clientTokenGateway;
 
+  @Mock
+  private BraintreeRegistrarSyncer customerSyncer;
+
   private final RegistrarPaymentSetupAction action = new RegistrarPaymentSetupAction();
 
   @Before
   public void before() throws Exception {
     action.braintreeGateway = braintreeGateway;
+    action.customerSyncer = customerSyncer;
     action.registrar =
         Registrar.loadByClientId("TheRegistrar").asBuilder()
             .setBillingMethod(Registrar.BillingMethod.BRAINTREE)
@@ -79,6 +86,7 @@ public class RegistrarPaymentSetupActionTest {
                     "token", blanketsOfSadness,
                     "currencies", asList("USD", "JPY"),
                     "brainframe", "/doodle")));
+    verify(customerSyncer).sync(eq(action.registrar));
   }
 
   @Test