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.naming;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.checks.naming.AbstractNameCheck.MSG_INVALID_PATTERN;
  import static com.puppycrawl.tools.checkstyle.checks.naming.MethodNameCheck.MSG_KEY;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  public class MethodNameCheckTest
      extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/checks/naming/methodname";
      }
  
      @Test
      public void testGetRequiredTokens() {
          final MethodNameCheck checkObj = new MethodNameCheck();
          final int[] expected = {TokenTypes.METHOD_DEF};
          assertWithMessage("Default required tokens are invalid")
              .that(checkObj.getRequiredTokens())
              .isEqualTo(expected);
      }
  
      @Test
      public void testDefault()
              throws Exception {
  
          final String pattern = "^[a-z][a-zA-Z0-9]*$";
  
          final String[] expected = {
              "144:10: " + getCheckMessage(MSG_INVALID_PATTERN, "ALL_UPPERCASE_METHOD", pattern),
          };
          verifyWithInlineConfigParser(
                  getPath("InputMethodNameSimple.java"), expected);
      }
  
      @Test
      public void testMethodEqClass() throws Exception {
  
          final String pattern = "^[a-z][a-zA-Z0-9]*$";
  
          final String[] expected = {
              "24:16: " + getCheckMessage(MSG_KEY, "InputMethodNameEqualClassName"),
              "24:16: " + getCheckMessage(MSG_INVALID_PATTERN,
                      "InputMethodNameEqualClassName", pattern),
              "29:17: " + getCheckMessage(MSG_INVALID_PATTERN, "PRIVATEInputMethodNameEqualClassName",
                      pattern),
              "35:20: " + getCheckMessage(MSG_KEY, "Inner"),
              "35:20: " + getCheckMessage(MSG_INVALID_PATTERN, "Inner", pattern),
              "40:20: " + getCheckMessage(MSG_INVALID_PATTERN,
                      "InputMethodNameEqualClassName", pattern),
              "49:24: " + getCheckMessage(MSG_KEY, "InputMethodNameEqualClassName"),
              "49:24: " + getCheckMessage(MSG_INVALID_PATTERN,
                      "InputMethodNameEqualClassName", pattern),
              "59:9: " + getCheckMessage(MSG_KEY, "SweetInterface"),
              "59:9: " + getCheckMessage(MSG_INVALID_PATTERN, "SweetInterface", pattern),
              "65:17: " + getCheckMessage(MSG_KEY, "Outer"),
              "65:17: " + getCheckMessage(MSG_INVALID_PATTERN, "Outer", pattern),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputMethodNameEqualClassName.java"), expected);
      }
  
      @Test
      public void testMethodEqClassAllow() throws Exception {
          final String pattern = "^[a-z][a-zA-Z0-9]*$";
  
          final String[] expected = {
              "24:16: " + getCheckMessage(MSG_INVALID_PATTERN,
                      "InputMethodNameEqualClassName2", pattern),
              "29:17: " + getCheckMessage(MSG_INVALID_PATTERN, "PRIVATEInputMethodNameEqualClassName",
                      pattern),
              "35:20: " + getCheckMessage(MSG_INVALID_PATTERN, "Inner", pattern),
              "40:20: " + getCheckMessage(MSG_INVALID_PATTERN,
                      "InputMethodNameEqualClassName2", pattern),
              "49:24: " + getCheckMessage(MSG_INVALID_PATTERN,
                      "InputMethodNameEqualClassName2", pattern),
              "59:9: " + getCheckMessage(MSG_INVALID_PATTERN, "SweetInterface", pattern),
              "65:17: " + getCheckMessage(MSG_INVALID_PATTERN, "Outer", pattern),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputMethodNameEqualClassName2.java"), expected);
      }
  
      @Test
      public void testAccessTuning() throws Exception {
          final String pattern = "^[a-z][a-zA-Z0-9]*$";
  
          final String[] expected = {
              "24:16: " + getCheckMessage(MSG_INVALID_PATTERN,
                      "InputMethodNameEqualClassName3", pattern),
              "35:20: " + getCheckMessage(MSG_INVALID_PATTERN, "Inner", pattern),
              "40:20: " + getCheckMessage(MSG_INVALID_PATTERN,
                      "InputMethodNameEqualClassName3", pattern),
              "49:24: " + getCheckMessage(MSG_INVALID_PATTERN,
                      "InputMethodNameEqualClassName3", pattern),
              "59:9: " + getCheckMessage(MSG_INVALID_PATTERN, "SweetInterface", pattern),
              "65:17: " + getCheckMessage(MSG_INVALID_PATTERN, "Outer", pattern),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputMethodNameEqualClassName3.java"), expected);
      }
  
      @Test
      public void testForNpe() throws Exception {
  
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
  
          verifyWithInlineConfigParser(
                  getPath("InputMethodNameExtra.java"), expected);
      }
  
      @Test
      public void testOverriddenMethods() throws Exception {
  
          final String pattern = "^[a-z][a-zA-Z0-9]*$";
  
          final String[] expected = {
              "29:17: " + getCheckMessage(MSG_INVALID_PATTERN, "PUBLICfoo", pattern),
              "32:20: " + getCheckMessage(MSG_INVALID_PATTERN, "PROTECTEDfoo", pattern),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputMethodNameOverriddenMethods.java"), expected);
      }
  
      @Test
      public void testInterfacesExcludePublic() throws Exception {
          final String pattern = "^[a-z][a-zA-Z0-9]*$";
  
          final String[] expected = {
              "18:18: " + getCheckMessage(MSG_INVALID_PATTERN, "PrivateMethod", pattern),
              "20:25: " + getCheckMessage(MSG_INVALID_PATTERN, "PrivateMethod2", pattern),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputMethodNamePublicMethodsInInterfaces.java"),
              expected);
      }
  
      @Test
      public void testInterfacesExcludePrivate() throws Exception {
          final String pattern = "^[a-z][a-zA-Z0-9]*$";
  
          final String[] expected = {
              "22:18: " + getCheckMessage(MSG_INVALID_PATTERN, "DefaultMethod", pattern),
              "25:25: " + getCheckMessage(MSG_INVALID_PATTERN, "DefaultMethod2", pattern),
              "28:10: " + getCheckMessage(MSG_INVALID_PATTERN, "PublicMethod", pattern),
              "30:17: " + getCheckMessage(MSG_INVALID_PATTERN, "PublicMethod2", pattern),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputMethodNamePrivateMethodsInInterfaces.java"),
              expected);
      }
  
      @Test
      public void testGetAcceptableTokens() {
          final MethodNameCheck methodNameCheckObj = new MethodNameCheck();
          final int[] actual = methodNameCheckObj.getAcceptableTokens();
          final int[] expected = {
              TokenTypes.METHOD_DEF,
          };
          assertWithMessage("Default acceptable tokens are invalid")
              .that(actual)
              .isEqualTo(expected);
      }
  
      @Test
      public void testRecordInInterfaceBody() throws Exception {
  
          final String pattern = "^[a-z][a-zA-Z0-9]*$";
  
          final String[] expected = {
              "24:14: " + getCheckMessage(MSG_INVALID_PATTERN, "VIOLATION", pattern),
          };
  
          verifyWithInlineConfigParser(
                  getNonCompilablePath("InputMethodNameRecordInInterfaceBody.java"), expected);
      }
  
  }
  