gt:         final RandomAccessFile file = mock(RandomAccessFile.class);
context: ////////////////////////////////////////////////////////////////////////////////
  // checkstyle: Checks Java source code for adherence to a set of rules.
  // Copyright (C) 2001-2017 the original author or authors.
  //
  // This library is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public
  // License as published by the Free Software Foundation; either
  // version 2.1 of the License, or (at your option) any later version.
  //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.checks;
  
  import static com.puppycrawl.tools.checkstyle.checks.NewlineAtEndOfFileCheck.MSG_KEY_NO_NEWLINE_EOF;
  import static com.puppycrawl.tools.checkstyle.checks.NewlineAtEndOfFileCheck.MSG_KEY_UNABLE_OPEN;
  import static java.util.Locale.ENGLISH;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  import static org.powermock.api.mockito.PowerMockito.mock;
  import static org.powermock.api.mockito.PowerMockito.when;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.RandomAccessFile;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Set;
  
  import org.junit.Test;
  
  import com.puppycrawl.tools.checkstyle.BaseCheckTestSupport;
  import com.puppycrawl.tools.checkstyle.DefaultConfiguration;
  import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
  import com.puppycrawl.tools.checkstyle.api.Configuration;
  import com.puppycrawl.tools.checkstyle.api.LocalizedMessage;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtils;
  
  public class NewlineAtEndOfFileCheckTest
      extends BaseCheckTestSupport {
      @Override
      protected DefaultConfiguration createCheckerConfig(
          Configuration config) {
          final DefaultConfiguration dc = new DefaultConfiguration("root");
          dc.addChild(config);
          return dc;
      }
  
      @Override
      protected String getPath(String filename) throws IOException {
          return super.getPath("checks" + File.separator + filename);
      }
  
      @Test
      public void testNewlineLfAtEndOfFile() throws Exception {
          final DefaultConfiguration checkConfig =
              createCheckConfig(NewlineAtEndOfFileCheck.class);
          checkConfig.addAttribute("lineSeparator", LineSeparatorOption.LF.toString());
          final String[] expected = CommonUtils.EMPTY_STRING_ARRAY;
          verify(
              createChecker(checkConfig),
              getPath("InputNewlineLfAtEndOfFile.java"),
              expected);
      }
  
      @Test
      public void testNewlineCrlfAtEndOfFile() throws Exception {
          final DefaultConfiguration checkConfig =
              createCheckConfig(NewlineAtEndOfFileCheck.class);
          checkConfig.addAttribute("lineSeparator", LineSeparatorOption.CRLF.toString());
          final String[] expected = CommonUtils.EMPTY_STRING_ARRAY;
          verify(
              createChecker(checkConfig),
              getPath("InputNewlineCrlfAtEndOfFile.java"),
              expected);
      }
  
      @Test
      public void testNewlineCrAtEndOfFile() throws Exception {
          final DefaultConfiguration checkConfig =
              createCheckConfig(NewlineAtEndOfFileCheck.class);
          checkConfig.addAttribute("lineSeparator", LineSeparatorOption.CR.toString());
          final String[] expected = CommonUtils.EMPTY_STRING_ARRAY;
          verify(
              createChecker(checkConfig),
              getPath("InputNewlineCrAtEndOfFile.java"),
              expected);
      }
  
      @Test
      public void testAnyNewlineAtEndOfFile() throws Exception {
          final DefaultConfiguration checkConfig =
              createCheckConfig(NewlineAtEndOfFileCheck.class);
          checkConfig.addAttribute("lineSeparator", LineSeparatorOption.LF_CR_CRLF.toString());
          final String[] expected = CommonUtils.EMPTY_STRING_ARRAY;
          verify(
              createChecker(checkConfig),
              getPath("InputNewlineCrlfAtEndOfFile.java"),
              expected);
          verify(
              createChecker(checkConfig),
              getPath("InputNewlineLfAtEndOfFile.java"),
              expected);
          verify(
              createChecker(checkConfig),
              getPath("InputNewlineCrAtEndOfFile.java"),
              expected);
      }
  
      @Test
      public void testNoNewlineLfAtEndOfFile() throws Exception {
          final DefaultConfiguration checkConfig =
              createCheckConfig(NewlineAtEndOfFileCheck.class);
          checkConfig.addAttribute("lineSeparator", LineSeparatorOption.LF.toString());
          final String[] expected = {
              "0: " + getCheckMessage(MSG_KEY_NO_NEWLINE_EOF),
          };
          verify(
              createChecker(checkConfig),
              getPath("InputNoNewlineAtEndOfFile.java"),
              expected);
      }
  
      @Test
      public void testNoNewlineAtEndOfFile() throws Exception {
          final DefaultConfiguration checkConfig =
              createCheckConfig(NewlineAtEndOfFileCheck.class);
          checkConfig.addAttribute("lineSeparator", LineSeparatorOption.LF_CR_CRLF.toString());
          final String[] expected = {
              "0: " + getCheckMessage(MSG_KEY_NO_NEWLINE_EOF),
          };
          verify(
              createChecker(checkConfig),
              getPath("InputNoNewlineAtEndOfFile.java"),
              expected);
      }
  
      @Test
      public void testSetLineSeparatorFailure()
              throws Exception {
          final DefaultConfiguration checkConfig =
              createCheckConfig(NewlineAtEndOfFileCheck.class);
          checkConfig.addAttribute("lineSeparator", "ct");
          try {
              createChecker(checkConfig);
              fail("exception expected");
          }
          catch (CheckstyleException ex) {
              assertTrue(ex.getMessage().startsWith(
                      "cannot initialize module com.puppycrawl.tools.checkstyle."
                              + "checks.NewlineAtEndOfFileCheck - "
                              + "Cannot set property 'lineSeparator' to 'ct' in module"));
          }
      }
  
      @Test
      public void testEmptyFileFile() throws Exception {
          final DefaultConfiguration checkConfig =
              createCheckConfig(NewlineAtEndOfFileCheck.class);
          checkConfig.addAttribute("lineSeparator", LineSeparatorOption.LF.toString());
          final String[] expected = {
              "0: " + getCheckMessage(MSG_KEY_NO_NEWLINE_EOF),
          };
          verify(
              createChecker(checkConfig),
              getPath("InputEmptyFile.txt"),
              expected);
      }
  
      @Test
      public void testWrongFile() throws Exception {
          final DefaultConfiguration checkConfig = createCheckConfig(NewlineAtEndOfFileCheck.class);
          final NewlineAtEndOfFileCheck check = new NewlineAtEndOfFileCheck();
          check.configure(checkConfig);
          final List<String> lines = new ArrayList<>(1);
          lines.add("txt");
          final File impossibleFile = new File("");
          final Set<LocalizedMessage> messages = check.process(impossibleFile, lines);
          assertEquals(1, messages.size());
          final Iterator<LocalizedMessage> iterator = messages.iterator();
          assertEquals(getCheckMessage(MSG_KEY_UNABLE_OPEN, ""), iterator.next().getMessage());
      }
  
      @Test
      public void testWrongSeparatorLength() throws Exception {
          final NewlineAtEndOfFileCheck check = new NewlineAtEndOfFileCheck();
          final DefaultConfiguration checkConfig = createCheckConfig(NewlineAtEndOfFileCheck.class);
          check.configure(checkConfig);
  
          final Method method = NewlineAtEndOfFileCheck.class
                  .getDeclaredMethod("endsWithNewline", RandomAccessFile.class);
          method.setAccessible(true);
  