code: ///////////////////////////////////////////////////////////////////////////////////////////////
  // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
  // Copyright (C) 2001-2023 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.whitespace;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.checks.whitespace.EmptyForIteratorPadCheck.MSG_WS_FOLLOWED;
  import static com.puppycrawl.tools.checkstyle.checks.whitespace.EmptyForIteratorPadCheck.MSG_WS_NOT_FOLLOWED;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  public class EmptyForIteratorPadCheckTest
      extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/checks/whitespace/emptyforiteratorpad";
      }
  
      @Test
      public void testGetRequiredTokens() {
          final EmptyForIteratorPadCheck checkObj = new EmptyForIteratorPadCheck();
          final int[] expected = {TokenTypes.FOR_ITERATOR};
          assertWithMessage("Default required tokens are invalid")
              .that(checkObj.getRequiredTokens())
              .isEqualTo(expected);
      }
  
      @Test
      public void testDefault() throws Exception {
          final String[] expected = {
              "30:32: " + getCheckMessage(MSG_WS_FOLLOWED, ";"),
              "46:33: " + getCheckMessage(MSG_WS_FOLLOWED, ";"),
              "58:12: " + getCheckMessage(MSG_WS_FOLLOWED, ";"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputEmptyForIteratorPad.java"), expected);
      }
  
      @Test
      public void testSpaceOption() throws Exception {
          final String[] expected = {
              "26:31: " + getCheckMessage(MSG_WS_NOT_FOLLOWED, ";"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputEmptyForIteratorPad1.java"), expected);
      }
  
      @Test
      public void testWithEmoji() throws Exception {
          final String[] expected = {
              "24:40: " + getCheckMessage(MSG_WS_FOLLOWED, ";"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputEmptyForIteratorPadWithEmoji.java"), expected);
  
      }
  
      @Test
      public void testGetAcceptableTokens() {
          final EmptyForIteratorPadCheck emptyForIteratorPadCheckObj = new EmptyForIteratorPadCheck();
          final int[] actual = emptyForIteratorPadCheckObj.getAcceptableTokens();
          final int[] expected = {
              TokenTypes.FOR_ITERATOR,
          };
          assertWithMessage("Default acceptable tokens are invalid")
              .that(actual)
              .isEqualTo(expected);
      }
  
      @Test
      public void testInvalidOption() throws Exception {
          try {
              final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
  
              verifyWithInlineConfigParser(getPath("InputEmptyForIteratorPad2.java"), expected);
              assertWithMessage("exception expected").fail();
          }
          catch (CheckstyleException ex) {
              assertWithMessage("Invalid exception message")
                  .that(ex.getMessage())
                  .isEqualTo("cannot initialize module com.puppycrawl.tools.checkstyle.TreeWalker - "
                      + "cannot initialize module com.puppycrawl.tools.checkstyle.checks."
                      + "whitespace.EmptyForIteratorPadCheck - "
                      + "Cannot set property 'option' to 'invalid_option'");
          }
      }
  
      @Test
      public void testTrimOptionProperty() throws Exception {
          final String[] expected = {
              "20:31: " + getCheckMessage(MSG_WS_NOT_FOLLOWED, ";"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputEmptyForIteratorPadToCheckTrimFunctionInOptionProperty.java"),
                  expected);
  
      }
  
      @Test
      public void testUppercaseOptionProperty() throws Exception {
          final String[] expected = {
              "20:31: " + getCheckMessage(MSG_WS_NOT_FOLLOWED, ";"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputEmptyForIteratorPadToCheckUppercaseFunctionInOptionProperty.java"),
                  expected);
  
      }
  }
  