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.regexp;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.checks.regexp.MultilineDetector.MSG_REGEXP_EXCEEDED;
  import static com.puppycrawl.tools.checkstyle.checks.regexp.MultilineDetector.MSG_REGEXP_MINIMUM;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  public class RegexpSinglelineJavaCheckTest extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/checks/regexp/regexpsinglelinejava";
      }
  
      @Test
      public void testGetAcceptableTokens() {
          final RegexpSinglelineJavaCheck regexpSinglelineJavaCheck =
              new RegexpSinglelineJavaCheck();
          assertWithMessage("Default acceptable tokens are invalid")
                  .that(regexpSinglelineJavaCheck.getAcceptableTokens())
                  .isEmpty();
      }
  
      @Test
      public void testGetRequiredTokens() {
          final RegexpSinglelineJavaCheck checkObj = new RegexpSinglelineJavaCheck();
          assertWithMessage("Default required tokens are invalid")
                  .that(checkObj.getRequiredTokens())
                  .isEmpty();
      }
  
      @Test
      public void testIt() throws Exception {
          final String[] expected = {
              "77: " + getCheckMessage(MSG_REGEXP_EXCEEDED, "System\\.(out)|(err)\\.print(ln)?\\("),
          };
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaSemantic.java"), expected);
      }
  
      @Test
      public void testMessageProperty()
              throws Exception {
          final String[] expected = {
              "78: " + "Bad line :(",
          };
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaSemantic2.java"), expected);
      }
  
      @Test
      public void testIgnoreCaseTrue() throws Exception {
          final String[] expected = {
              "78: " + getCheckMessage(MSG_REGEXP_EXCEEDED, "SYSTEM\\.(OUT)|(ERR)\\.PRINT(LN)?\\("),
          };
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaSemantic3.java"), expected);
      }
  
      @Test
      public void testIgnoreCaseFalse() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaSemantic4.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsCppStyle() throws Exception {
          // See if the comment is removed properly
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsFalseCppStyle() throws Exception {
          // See if the comment is removed properly
          final String[] expected = {
              "16: " + getCheckMessage(MSG_REGEXP_EXCEEDED, "don't\\suse trailing comments"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment2.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsBlockStyle() throws Exception {
          // See if the comment is removed properly
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment3.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsFalseBlockStyle() throws Exception {
          final String[] expected = {
              "31: " + getCheckMessage(MSG_REGEXP_EXCEEDED, "c-style\\s1"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment4.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsMultipleBlockStyle() throws Exception {
          // See if a second comment on the same line is removed properly
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment5.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsMultiLine() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment6.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsInlineStart() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment7.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsInlineEnd() throws Exception {
          final String[] expected = {
              "34: " + getCheckMessage(MSG_REGEXP_EXCEEDED, "int z"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment8.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsInlineMiddle() throws Exception {
          final String[] expected = {
              "35: " + getCheckMessage(MSG_REGEXP_EXCEEDED, "int y"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment9.java"), expected);
      }
  
      @Test
      public void testIgnoreCommentsNoSpaces() throws Exception {
          // make sure the comment is not turned into spaces
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment10.java"), expected);
      }
  
      @Test
      public void test1371588() throws Exception {
          // StackOverflowError with trailing space and ignoreComments
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaTrailingComment11.java"), expected);
      }
  
      @Test
      public void testExistingInDoc() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaSemantic5.java"), expected);
      }
  
      @Test
      public void testExistingInCode() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaSemantic6.java"), expected);
      }
  
      @Test
      public void testMissing() throws Exception {
          final String[] expected = {
              "1: " + getCheckMessage(MSG_REGEXP_MINIMUM, 1, "This\\stext is not in the file"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaSemantic7.java"), expected);
      }
  
      @Test
      public void testDefault() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputRegexpSinglelineJavaSemantic8.java"), expected);
      }
  }
  