mv com/google/domain/registry google/registry

This change renames directories in preparation for the great package
rename. The repository is now in a broken state because the code
itself hasn't been updated. However this should ensure that git
correctly preserves history for each file.

javatests/google/registry/testing/FailAnswer.java

@@ -0,0 +1,55 @@
+// 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 org.mockito.invocation.InvocationOnMock;
+import org.mockito.stubbing.Answer;
+
+/**
+ * Display helpful failure message if a mocked method is called.
+ *
+ * <p>One important problem this solves is when you mock servlets and the test fails, you usually
+ * end up with failure messages like {@code Wanted but not invoked: rsp.setStatus(200)} which
+ * aren't very helpful. This is because servlets normally report problems by calling
+ * {@link javax.servlet.http.HttpServletResponse#sendError(int, String) rsp.sendError()} so it'd be
+ * nice if we could have the error message be whatever arguments get passed to {@code sendError}.
+ *
+ * <p>And that's where {@link FailAnswer} comes to the rescue! Here's an example of what you could
+ * put at the beginning of a servlet test method to have better error messages:
+ *
+ * <pre>   {@code
+ *   doAnswer(new FailAnswer<>()).when(rsp).sendError(anyInt());
+ *   doAnswer(new FailAnswer<>()).when(rsp).sendError(anyInt(), anyString());
+ *   }</pre>
+ *
+ * @param <T> The return type of the mocked method (which doesn't actually return).
+ */
+public class FailAnswer<T> implements Answer<T> {
+
+  @Override
+  public T answer(@SuppressWarnings("null") InvocationOnMock args) throws Throwable {
+    StringBuilder msg = new StringBuilder();
+    boolean first = true;
+    for (Object arg : args.getArguments()) {
+      if (first) {
+        first = false;
+      } else {
+        msg.append(", ");
+      }
+      msg.append(arg);
+    }
+    throw new AssertionError(msg.toString());
+  }
+}