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.modifier;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.checks.modifier.InterfaceMemberImpliedModifierCheck.MSG_KEY;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.DetailAstImpl;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  public class InterfaceMemberImpliedModifierCheckTest
      extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/checks/modifier/interfacememberimpliedmodifier";
      }
  
      @Test
      public void testMethodsOnInterfaceNoImpliedPublicAbstract() throws Exception {
          final String[] expected = {
              "21:5: " + getCheckMessage(MSG_KEY, "public"),
              "27:5: " + getCheckMessage(MSG_KEY, "public"),
              "34:5: " + getCheckMessage(MSG_KEY, "public"),
              "36:5: " + getCheckMessage(MSG_KEY, "abstract"),
              "38:5: " + getCheckMessage(MSG_KEY, "public"),
              "38:5: " + getCheckMessage(MSG_KEY, "abstract"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierMethodsOnInterface.java"),
              expected);
      }
  
      @Test
      public void testGetRequiredTokens() {
          final InterfaceMemberImpliedModifierCheck check = new InterfaceMemberImpliedModifierCheck();
          final int[] actual = check.getRequiredTokens();
          final int[] expected = {
              TokenTypes.METHOD_DEF,
              TokenTypes.VARIABLE_DEF,
              TokenTypes.INTERFACE_DEF,
              TokenTypes.CLASS_DEF,
              TokenTypes.ENUM_DEF,
          };
          assertWithMessage("Required tokens are invalid")
              .that(actual)
              .isEqualTo(expected);
      }
  
      @Test
      public void testMethodsOnInterfaceNoImpliedAbstractAllowImpliedPublic() throws Exception {
          final String[] expected = {
              "36:5: " + getCheckMessage(MSG_KEY, "abstract"),
              "38:5: " + getCheckMessage(MSG_KEY, "abstract"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierMethodsOnInterface2.java"),
              expected);
      }
  
      @Test
      public void testMethodsOnInterfaceNoImpliedPublicAllowImpliedAbstract() throws Exception {
          final String[] expected = {
              "21:5: " + getCheckMessage(MSG_KEY, "public"),
              "27:5: " + getCheckMessage(MSG_KEY, "public"),
              "34:5: " + getCheckMessage(MSG_KEY, "public"),
              "38:5: " + getCheckMessage(MSG_KEY, "public"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierMethodsOnInterface3.java"),
              expected);
      }
  
      @Test
      public void testMethodsOnInterfaceAllowImpliedPublicAbstract() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierMethodsOnInterface4.java"),
              expected);
      }
  
      @Test
      public void testMethodsOnClassIgnored() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierMethodsOnClass.java"),
              expected);
      }
  
      @Test
      public void testMethodsOnInterfaceNestedNoImpliedPublicAbstract() throws Exception {
          final String[] expected = {
              "23:9: " + getCheckMessage(MSG_KEY, "public"),
              "29:9: " + getCheckMessage(MSG_KEY, "public"),
              "34:9: " + getCheckMessage(MSG_KEY, "public"),
              "36:9: " + getCheckMessage(MSG_KEY, "abstract"),
              "38:9: " + getCheckMessage(MSG_KEY, "public"),
              "38:9: " + getCheckMessage(MSG_KEY, "abstract"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierMethodsOnInterfaceNested.java"),
              expected);
      }
  
      @Test
      public void testMethodsOnClassNestedNoImpliedPublicAbstract() throws Exception {
          final String[] expected = {
              "23:9: " + getCheckMessage(MSG_KEY, "public"),
              "29:9: " + getCheckMessage(MSG_KEY, "public"),
              "34:9: " + getCheckMessage(MSG_KEY, "public"),
              "36:9: " + getCheckMessage(MSG_KEY, "abstract"),
              "38:9: " + getCheckMessage(MSG_KEY, "public"),
              "38:9: " + getCheckMessage(MSG_KEY, "abstract"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierMethodsOnClassNested.java"),
              expected);
      }
  
      @Test
      public void testFieldsOnInterfaceNoImpliedPublicStaticFinal() throws Exception {
          final String[] expected = {
              "20:5: " + getCheckMessage(MSG_KEY, "final"),
              "22:5: " + getCheckMessage(MSG_KEY, "static"),
              "24:5: " + getCheckMessage(MSG_KEY, "static"),
              "24:5: " + getCheckMessage(MSG_KEY, "final"),
              "26:5: " + getCheckMessage(MSG_KEY, "public"),
              "28:5: " + getCheckMessage(MSG_KEY, "public"),
              "28:5: " + getCheckMessage(MSG_KEY, "final"),
              "30:5: " + getCheckMessage(MSG_KEY, "public"),
              "30:5: " + getCheckMessage(MSG_KEY, "static"),
              "32:5: " + getCheckMessage(MSG_KEY, "public"),
              "32:5: " + getCheckMessage(MSG_KEY, "static"),
              "32:5: " + getCheckMessage(MSG_KEY, "final"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierFieldsOnInterface.java"),
              expected);
      }
  
      @Test
      public void testFieldsOnInterfaceNoImpliedPublicStaticAllowImpliedFinal() throws Exception {
          final String[] expected = {
              "22:5: " + getCheckMessage(MSG_KEY, "static"),
              "24:5: " + getCheckMessage(MSG_KEY, "static"),
              "26:5: " + getCheckMessage(MSG_KEY, "public"),
              "28:5: " + getCheckMessage(MSG_KEY, "public"),
              "30:5: " + getCheckMessage(MSG_KEY, "public"),
              "30:5: " + getCheckMessage(MSG_KEY, "static"),
              "32:5: " + getCheckMessage(MSG_KEY, "public"),
              "32:5: " + getCheckMessage(MSG_KEY, "static"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierFieldsOnInterface2.java"),
              expected);
      }
  
      @Test
      public void testFieldsOnInterfaceNoImpliedPublicFinalAllowImpliedStatic() throws Exception {
          final String[] expected = {
              "20:5: " + getCheckMessage(MSG_KEY, "final"),
              "24:5: " + getCheckMessage(MSG_KEY, "final"),
              "26:5: " + getCheckMessage(MSG_KEY, "public"),
              "28:5: " + getCheckMessage(MSG_KEY, "public"),
              "28:5: " + getCheckMessage(MSG_KEY, "final"),
              "30:5: " + getCheckMessage(MSG_KEY, "public"),
              "32:5: " + getCheckMessage(MSG_KEY, "public"),
              "32:5: " + getCheckMessage(MSG_KEY, "final"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierFieldsOnInterface3.java"),
              expected);
      }
  
      @Test
      public void testFieldsOnInterfaceNoImpliedStaticFinalAllowImpliedPublic() throws Exception {
          final String[] expected = {
              "20:5: " + getCheckMessage(MSG_KEY, "final"),
              "22:5: " + getCheckMessage(MSG_KEY, "static"),
              "24:5: " + getCheckMessage(MSG_KEY, "static"),
              "24:5: " + getCheckMessage(MSG_KEY, "final"),
              "28:5: " + getCheckMessage(MSG_KEY, "final"),
              "30:5: " + getCheckMessage(MSG_KEY, "static"),
              "32:5: " + getCheckMessage(MSG_KEY, "static"),
              "32:5: " + getCheckMessage(MSG_KEY, "final"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierFieldsOnInterface4.java"),
              expected);
      }
  
      @Test
      public void testFieldsOnInterfaceAllowImpliedPublicStaticFinal() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierFieldsOnInterface5.java"),
              expected);
      }
  
      @Test
      public void testFieldsOnClassIgnored() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierFieldsOnClass.java"),
              expected);
      }
  
      @Test
      public void testNestedOnInterfaceNoImpliedPublicStatic() throws Exception {
          final String[] expected = {
              "21:5: " + getCheckMessage(MSG_KEY, "static"),
              "24:5: " + getCheckMessage(MSG_KEY, "public"),
              "27:5: " + getCheckMessage(MSG_KEY, "public"),
              "27:5: " + getCheckMessage(MSG_KEY, "static"),
              "35:5: " + getCheckMessage(MSG_KEY, "static"),
              "40:5: " + getCheckMessage(MSG_KEY, "public"),
              "45:5: " + getCheckMessage(MSG_KEY, "public"),
              "45:5: " + getCheckMessage(MSG_KEY, "static"),
              "53:5: " + getCheckMessage(MSG_KEY, "static"),
              "56:5: " + getCheckMessage(MSG_KEY, "public"),
              "59:5: " + getCheckMessage(MSG_KEY, "public"),
              "59:5: " + getCheckMessage(MSG_KEY, "static"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierNestedOnInterface.java"),
              expected);
      }
  
      @Test
      public void testNestedOnInterfaceNoImpliedStaticAllowImpliedPublic() throws Exception {
          final String[] expected = {
              "21:5: " + getCheckMessage(MSG_KEY, "static"),
              "27:5: " + getCheckMessage(MSG_KEY, "static"),
              "35:5: " + getCheckMessage(MSG_KEY, "static"),
              "45:5: " + getCheckMessage(MSG_KEY, "static"),
              "53:5: " + getCheckMessage(MSG_KEY, "static"),
              "59:5: " + getCheckMessage(MSG_KEY, "static"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierNestedOnInterface2.java"),
              expected);
      }
  
      @Test
      public void testNestedOnInterfaceNoImpliedPublicAllowImpliedStatic() throws Exception {
          final String[] expected = {
              "24:5: " + getCheckMessage(MSG_KEY, "public"),
              "27:5: " + getCheckMessage(MSG_KEY, "public"),
              "40:5: " + getCheckMessage(MSG_KEY, "public"),
              "45:5: " + getCheckMessage(MSG_KEY, "public"),
              "56:5: " + getCheckMessage(MSG_KEY, "public"),
              "59:5: " + getCheckMessage(MSG_KEY, "public"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierNestedOnInterface3.java"),
              expected);
      }
  
      @Test
      public void testNestedOnInterfaceAllowImpliedPublicStatic() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierNestedOnInterface4.java"),
              expected);
      }
  
      @Test
      public void testNestedOnClassIgnored() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierNestedOnClass.java"),
              expected);
      }
  
      @Test
      public void testNestedOnInterfaceNestedNoImpliedPublicStatic() throws Exception {
          final String[] expected = {
              "20:9: " + getCheckMessage(MSG_KEY, "public"),
              "20:9: " + getCheckMessage(MSG_KEY, "static"),
              "23:9: " + getCheckMessage(MSG_KEY, "public"),
              "23:9: " + getCheckMessage(MSG_KEY, "static"),
              "28:9: " + getCheckMessage(MSG_KEY, "public"),
              "28:9: " + getCheckMessage(MSG_KEY, "static"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierNestedOnInterfaceNested.java"),
              expected);
      }
  
      @Test
      public void testNestedOnClassNestedNoImpliedPublicStatic() throws Exception {
          final String[] expected = {
              "20:9: " + getCheckMessage(MSG_KEY, "public"),
              "20:9: " + getCheckMessage(MSG_KEY, "static"),
              "23:9: " + getCheckMessage(MSG_KEY, "public"),
              "23:9: " + getCheckMessage(MSG_KEY, "static"),
              "28:9: " + getCheckMessage(MSG_KEY, "public"),
              "28:9: " + getCheckMessage(MSG_KEY, "static"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierNestedOnClassNested.java"),
              expected);
      }
  
      @Test
      public void testPackageScopeInterface() throws Exception {
          final String[] expected = {
              "20:5: " + getCheckMessage(MSG_KEY, "final"),
              "22:5: " + getCheckMessage(MSG_KEY, "static"),
              "24:5: " + getCheckMessage(MSG_KEY, "static"),
              "24:5: " + getCheckMessage(MSG_KEY, "final"),
              "26:5: " + getCheckMessage(MSG_KEY, "public"),
              "28:5: " + getCheckMessage(MSG_KEY, "public"),
              "28:5: " + getCheckMessage(MSG_KEY, "final"),
              "30:5: " + getCheckMessage(MSG_KEY, "public"),
              "30:5: " + getCheckMessage(MSG_KEY, "static"),
              "32:5: " + getCheckMessage(MSG_KEY, "public"),
              "32:5: " + getCheckMessage(MSG_KEY, "static"),
              "32:5: " + getCheckMessage(MSG_KEY, "final"),
              "37:5: " + getCheckMessage(MSG_KEY, "public"),
              "43:5: " + getCheckMessage(MSG_KEY, "public"),
              "48:5: " + getCheckMessage(MSG_KEY, "public"),
              "50:5: " + getCheckMessage(MSG_KEY, "abstract"),
              "52:5: " + getCheckMessage(MSG_KEY, "public"),
              "52:5: " + getCheckMessage(MSG_KEY, "abstract"),
              "57:5: " + getCheckMessage(MSG_KEY, "static"),
              "60:5: " + getCheckMessage(MSG_KEY, "public"),
              "63:5: " + getCheckMessage(MSG_KEY, "public"),
              "63:5: " + getCheckMessage(MSG_KEY, "static"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierPackageScopeInterface.java"),
              expected);
      }
  
      @Test
      public void testPrivateMethodsOnInterface() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputInterfaceMemberImpliedModifierPrivateMethods.java"),
              expected);
      }
  
      @Test
      public void testIllegalState() {
          final DetailAstImpl init = new DetailAstImpl();
          init.setType(TokenTypes.STATIC_INIT);
          final DetailAstImpl objBlock = new DetailAstImpl();
          objBlock.setType(TokenTypes.OBJBLOCK);
          objBlock.addChild(init);
          final DetailAstImpl interfaceAst = new DetailAstImpl();
          interfaceAst.setType(TokenTypes.INTERFACE_DEF);
          interfaceAst.addChild(objBlock);
          final InterfaceMemberImpliedModifierCheck check =
              new InterfaceMemberImpliedModifierCheck();
          try {
              check.visitToken(init);
              assertWithMessage("IllegalStateException is expected").fail();
          }
          catch (IllegalStateException ex) {
              assertWithMessage("Error message is unexpected")
                  .that(ex.getMessage())
                  .isEqualTo(init.toString());
          }
      }
  
  }
  