gt:         final File expectedLastDirectory = new File(getPath(""));
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.gui;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.Locale;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.powermock.api.mockito.PowerMockito;
  import org.powermock.core.classloader.annotations.PrepareForTest;
  import org.powermock.modules.junit4.PowerMockRunner;
  import org.powermock.reflect.Whitebox;
  
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
  import com.puppycrawl.tools.checkstyle.gui.MainFrameModel.ParseMode;
  
  @RunWith(PowerMockRunner.class)
  public class MainFrameModelTest extends AbstractModuleTestSupport {
  
      private static final String FILE_NAME_TEST_DATA = "InputMainFrameModel.java";
      private static final String FILE_NAME_NON_JAVA = "NotJavaFile.notjava";
      private static final String FILE_NAME_NON_EXISTENT = "non-existent.file";
      private static final String FILE_NAME_NON_COMPILABLE = "InputMainFrameModelIncorrectClass.java";
  
      private MainFrameModel model;
      private File testData;
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/gui/mainframemodel";
      }
  
      @Before
      public void prepareTestData() throws IOException {
          model = new MainFrameModel();
          testData = new File(getPath(FILE_NAME_TEST_DATA));
      }
  
      @Test
      public void testParseModeEnum() {
          for (final ParseMode parseMode : ParseMode.values()) {
              switch (parseMode) {
                  case PLAIN_JAVA:
                      assertEquals("Invalid toString result", "Plain Java",
                              parseMode.toString());
                      break;
                  case JAVA_WITH_COMMENTS:
                      assertEquals("Invalid toString result", "Java with comments",
                              parseMode.toString());
                      break;
                  case JAVA_WITH_JAVADOC_AND_COMMENTS:
                      assertEquals("Invalid toString result", "Java with comments and Javadocs",
                              parseMode.toString());
                      break;
                  default:
                      fail("Unexpected enum value");
              }
          }
      }
  
      @Test
      public void testShouldAcceptFile() throws IOException {
          final File directory = PowerMockito.mock(File.class);
          PowerMockito.when(directory.isDirectory()).thenReturn(true);
          assertTrue("MainFrame should accept directory",
                  MainFrameModel.shouldAcceptFile(directory));
  
          final File javaFile = new File(getPath(FILE_NAME_TEST_DATA));
          assertTrue("MainFrame should accept java file",
                  MainFrameModel.shouldAcceptFile(javaFile));
  
          final File nonJavaFile = PowerMockito.mock(File.class);
          PowerMockito.when(nonJavaFile.isDirectory()).thenReturn(false);
          PowerMockito.when(nonJavaFile.getName()).thenReturn(FILE_NAME_NON_JAVA);
          assertFalse("MainFrame should not accept nonJava file",
                  MainFrameModel.shouldAcceptFile(nonJavaFile));
  
          final File nonExistentFile = new File(getPath(FILE_NAME_NON_EXISTENT));
          assertFalse("MainFrame should not accept nonexistent file",
                  MainFrameModel.shouldAcceptFile(nonExistentFile));
      }
  
      @Test
      public void testOpenFileWithParseModePlainJava() throws Exception {
          // Default parse mode: Plain Java
          model.openFile(testData);
          verifyCorrectTestDataInFrameModel();
  
          model.setParseMode(ParseMode.PLAIN_JAVA);
          verifyCorrectTestDataInFrameModel();
      }
  
      @Test
      public void testOpenFileWithParseModeJavaWithComments() throws Exception {
          model.setParseMode(ParseMode.JAVA_WITH_COMMENTS);
          model.openFile(testData);
  
          verifyCorrectTestDataInFrameModel();
      }
  
      @Test
      public void testOpenFileWithParseModeJavaWithJavadocAndComments() throws Exception {
          model.setParseMode(ParseMode.JAVA_WITH_JAVADOC_AND_COMMENTS);
          model.openFile(testData);
  
          verifyCorrectTestDataInFrameModel();
      }
  
      @Test
      @PrepareForTest(ParseMode.class)
      public void testOpenFileWithUnknownParseMode() throws CheckstyleException {
          final ParseMode unknownParseMode = PowerMockito.mock(ParseMode.class);
          Whitebox.setInternalState(unknownParseMode, "ordinal", 3);
  
          PowerMockito.when(unknownParseMode.toString()).thenReturn("Unknown parse mode");
          PowerMockito.mockStatic(ParseMode.class);
          PowerMockito.when(ParseMode.values()).thenReturn(
                  new ParseMode[] {
                      ParseMode.PLAIN_JAVA, ParseMode.JAVA_WITH_COMMENTS,
                      ParseMode.JAVA_WITH_JAVADOC_AND_COMMENTS, unknownParseMode, });
  
          try {
              model.setParseMode(unknownParseMode);
              model.openFile(testData);
  
              fail("Expected IllegalArgumentException is not thrown.");
          }
          catch (IllegalArgumentException ex) {
              assertEquals("Invalid exception message",
                      "Unknown mode: Unknown parse mode", ex.getMessage());
          }
      }
  
      @Test
      public void testOpenFileNullParameter() throws Exception {
          model.openFile(testData);
  
          model.openFile(null);
  
          // Model will not change with null input
          verifyCorrectTestDataInFrameModel();
      }
  
      @Test
      public void testOpenFileNonExistentFile() throws IOException {
          final File nonExistentFile = new File(getPath(FILE_NAME_NON_EXISTENT));
  
          try {
              model.openFile(nonExistentFile);
  
              fail("Expected CheckstyleException is not thrown.");
          }
          catch (CheckstyleException ex) {
              final String expectedMsg = String.format(Locale.ROOT,
                      "FileNotFoundException occurred while opening file %s.",
                      nonExistentFile.getPath());
  
              assertEquals("Invalid exception message", expectedMsg, ex.getMessage());
          }
      }
  
      @Test
      public void testOpenFileNonCompilableFile() throws IOException {
          final File nonCompilableFile = new File(getNonCompilablePath(FILE_NAME_NON_COMPILABLE));
  
          try {
              model.openFile(nonCompilableFile);
  
              fail("Expected CheckstyleException is not thrown.");
          }
          catch (CheckstyleException ex) {
              final String expectedMsg = String.format(Locale.ROOT,
                      "NoViableAltException occurred while opening file %s.",
                      nonCompilableFile.getPath());
  
              assertEquals("Invalid exception message", expectedMsg, ex.getMessage());
          }
      }
  
      private void verifyCorrectTestDataInFrameModel() throws IOException {
          assertEquals("Invalid current file", testData, model.getCurrentFile());
  
          final String expectedTitle = "Checkstyle GUI : " + FILE_NAME_TEST_DATA;
          assertEquals("Invalid model title", expectedTitle, model.getTitle());
  
          assertTrue("Reload action should be enabled", model.isReloadActionEnabled());
  
          final int expectedLines = 17;
          assertEquals("Invalid lines to position", expectedLines, model.getLinesToPosition().size());
  
          final String testDataFileNameWithoutPostfix = FILE_NAME_TEST_DATA.replace(".java", "");
          assertTrue("Invalid model text: " + model.getText(),
                  model.getText().contains(testDataFileNameWithoutPostfix));
  
  