// Copyright (C) 2014 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.googlesource.gerrit.plugins.serverconfig;

import static org.junit.Assert.*;

import java.io.UnsupportedEncodingException;
import org.eclipse.jgit.diff.RawText;
import org.junit.Test;

public class UnifiedDifferTest {

  @Test
  public void testUnchange() throws Exception {
    UnifiedDiffer classUnderTest = new UnifiedDiffer();
    String diff = classUnderTest.diff(t("key = old\n"), t("key = old\n"));
    assertEquals("", diff);
  }

  @Test
  public void testChangeValue() throws Exception {
    UnifiedDiffer classUnderTest = new UnifiedDiffer();
    String diff = classUnderTest.diff(t("key = old\n"), t("key = new\n"));
    assertEquals("@@ -1 +1 @@\n" + "-key = old\n" + "+key = new\n", diff);
  }

  @Test
  public void testAddedValue() throws Exception {
    UnifiedDiffer classUnderTest = new UnifiedDiffer();
    String diff = classUnderTest.diff(t("key1 = old\n"), t("key1 = old\n" + "key2 = new\n"));
    assertEquals("@@ -1 +1,2 @@\n" + " key1 = old\n" + "+key2 = new\n", diff);
  }

  @Test
  public void testDeletedValue() throws Exception {
    UnifiedDiffer classUnderTest = new UnifiedDiffer();
    String diff = classUnderTest.diff(t("key1 = old1\n" + "key1 = old2\n"), t("key1 = old1\n"));
    assertEquals("@@ -1,2 +1 @@\n" + " key1 = old1\n" + "-key1 = old2\n", diff);
  }

  private static RawText t(String text) throws UnsupportedEncodingException {
    return new RawText(text.toString().getBytes(UnifiedDiffer.CHARSET_NAME));
  }
}