Import code from internal repository to git

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

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+// Copyright 2016 Google Inc. 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;
+
+import java.io.ByteArrayOutputStream;
+import java.nio.ByteBuffer;
+
+/** Utility class for capturing channel output bytes from google cloud storage library mock. */
+public final class SlurpAnswer implements Answer<Integer> {
+
+  private final ByteArrayOutputStream out = new ByteArrayOutputStream();
+
+  @Override
+  public Integer answer(@SuppressWarnings("null") InvocationOnMock invocation) throws Exception {
+    ByteBuffer bytes = (ByteBuffer) invocation.getArguments()[0];
+    int count = 0;
+    while (bytes.hasRemaining()) {
+      out.write(bytes.get());
+      ++count;
+    }
+    return count;
+  }
+
+  public byte[] toByteArray() {
+    return out.toByteArray();
+  }
+}