code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.rxjava3.validators;
  
  import java.io.*;
  import java.util.*;
  import java.util.regex.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  /**
   * Check verifying there are no methods with the prefix "test" in the name.
   */
  public class TestPrefixInMethodName {
  
      private static final String pattern = "void\\s+test[a-zA-Z0-9]";
      private static final String replacement = "void ";
  
      @Test
      public void checkAndUpdateTestMethodNames() throws Exception {
          File f = TestHelper.findSource("Flowable");
          if (f == null) {
              System.out.println("Unable to find sources of RxJava");
              return;
          }
  
          Queue<File> dirs = new ArrayDeque<>();
  
          StringBuilder fail = new StringBuilder();
          fail.append("The following code pattern was found: ").append(pattern).append("\n");
          fail.append("Refresh and re-run tests!\n\n");
  
          File parent = f.getParentFile().getParentFile();
  
          dirs.offer(new File(parent.getAbsolutePath().replace('\\', '/')));
          dirs.offer(new File(parent.getAbsolutePath().replace('\\', '/').replace("src/main/java", "src/test/java")));
  
          Pattern p = Pattern.compile(pattern);
  
          int total = 0;
  
          while (!dirs.isEmpty()) {
              f = dirs.poll();
  
              File[] list = f.listFiles();
              if (list != null && list.length != 0) {
  
                  for (File u : list) {
                      if (u.isDirectory()) {
                          dirs.offer(u);
                      } else {
                          String fname = u.getName();
                          if (fname.endsWith(".java")) {
  
                              int lineNum = 0;
                              List<String> lines = new ArrayList<>();
                              BufferedReader in = new BufferedReader(new FileReader(u));
                              //boolean found = false;
                              try {
                                  for (; ; ) {
                                      String line = in.readLine();
                                      if (line == null) {
                                          break;
                                      }
                                      lineNum++;
  
                                      Matcher matcher = p.matcher(line);
                                      if (!line.startsWith("//") && !line.startsWith("*") && matcher.find()) {
                                          // found = true;
                                          fail
                                                  .append(fname)
                                                  .append("#L").append(lineNum)
                                                  .append("    ").append(line)
                                                  .append("\n");
                                          total++;
  
                                          int methodNameStartIndex = matcher.end() - 1;
                                          char firstChar = Character.toLowerCase(line.charAt(methodNameStartIndex));
  
                                          String newLine = matcher.replaceAll(replacement + firstChar);
  
                                          lines.add(newLine);
                                      } else {
                                          lines.add(line);
                                      }
  
                                  }
                              } finally {
                                  in.close();
                              }
  
                              /*if (found && System.getenv("CI") == null) {
                                  PrintWriter w = new PrintWriter(new FileWriter(u));
  
                                  try {
                                      for (String s : lines) {
                                          w.println(s);
                                      }
                                  } finally {
                                      w.close();
                                  }
                              }*/
                          }
                      }
                  }
              }
          }
          if (total != 0) {
              fail.append("Found ")
                      .append(total)
                      .append(" instances");
              System.out.println(fail);
              throw new AssertionError(fail.toString());
          }
      }
  }
  