text: // 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.
  
  #include <cstdlib> // For rand().
  #include <string>
  
  #include <gtest/gtest.h>
  
  #include <stout/bytes.hpp>
  #include <stout/gtest.hpp>
  #include <stout/svn.hpp>
  
  using std::string;
  
  
  TEST(SVNTest, DiffPatch)
  {
    string source;
  
    while (Bytes(source.size()) < Megabytes(1)) {
      source += (char) rand() % 256;
    }
  
    // Make the target string have 512 different bytes in the middle.
    string target = source;
  
    for (size_t index = 0; index < 512; index++) {
      target[1024 + index] = (char) rand() % 256;
    }
  
    ASSERT_NE(source, target);
  
    Try<svn::Diff> diff = svn::diff(source, target);
  
    ASSERT_SOME(diff);
  
    Try<string> result = svn::patch(source, diff.get());
  
    ASSERT_SOME_EQ(target, result);
    ASSERT_SOME_NE(source, result);
  }
  
  
  TEST(SVNTest, EmptyDiffPatch)
  {
    string source;
  
    while (Bytes(source.size()) < Megabytes(1)) {
      source += (char) rand() % 256;
    }
  
    // Make the target string equal the source string.
    string target = source;
  
    Try<svn::Diff> diff = svn::diff(source, target);
  
    ASSERT_SOME(diff);
  
    Try<string> result = svn::patch(source, diff.get());
  
    ASSERT_SOME_EQ(target, result);
    ASSERT_SOME_EQ(source, result);
  }
  