public void testRemoveSourceRoot() {
    final VirtualFile root = ModuleRootManager.getInstance(myModule).getContentRoots()[0];

    PsiTodoSearchHelper.SERVICE
        .getInstance(myProject)
        .findFilesWithTodoItems(); // to initialize caches

    new WriteCommandAction.Simple(getProject()) {
      @Override
      protected void run() throws Throwable {
        VirtualFile newFile = createChildData(root, "New.java");
        setFileText(newFile, "class A{ Exception e;} //todo");
      }
    }.execute().throwException();

    PsiDocumentManager.getInstance(myProject).commitAllDocuments();

    PsiTodoSearchHelper.SERVICE.getInstance(myProject).findFilesWithTodoItems(); // to update caches

    VirtualFile[] sourceRoots = ModuleRootManager.getInstance(myModule).getSourceRoots();
    LOG.assertTrue(sourceRoots.length == 1);
    PsiTestUtil.removeSourceRoot(myModule, sourceRoots[0]);

    PsiClass exceptionClass =
        myJavaFacade.findClass("java.lang.Exception", GlobalSearchScope.allScope(getProject()));
    assertNotNull(exceptionClass);
    // currently it actually finds usages by FQN due to Java PSI enabled for out-of-source java
    // files
    // so the following check is disabled
    // checkUsages(exceptionClass, new String[]{});
    checkTodos(new String[] {"2.java", "New.java"});
  }
  public void testSCR6066() throws Exception {
    ProjectRootManagerEx rootManager =
        (ProjectRootManagerEx) ProjectRootManager.getInstance(myProject);
    final VirtualFile root = rootManager.getContentRoots()[0];

    PsiTodoSearchHelper.SERVICE
        .getInstance(myProject)
        .findFilesWithTodoItems(); // to initialize caches

    new WriteCommandAction.Simple(getProject()) {
      @Override
      protected void run() throws Throwable {
        VirtualFile newFile = createChildData(root, "New.java");
        setFileText(newFile, "class A{ Exception e;} //todo");
      }
    }.execute().throwException();

    PsiDocumentManager.getInstance(myProject).commitAllDocuments();

    PsiTodoSearchHelper.SERVICE.getInstance(myProject).findFilesWithTodoItems(); // to update caches

    PsiTestUtil.addExcludedRoot(myModule, root);

    PsiClass exceptionClass =
        myJavaFacade.findClass("java.lang.Exception", GlobalSearchScope.allScope(getProject()));
    assertNotNull(exceptionClass);
    checkUsages(exceptionClass, new String[] {});
    checkTodos(new String[] {});
  }
  public void testAddSourceRoot() throws Exception {
    File dir = createTempDirectory();

    final VirtualFile root =
        LocalFileSystem.getInstance()
            .refreshAndFindFileByPath(dir.getCanonicalPath().replace(File.separatorChar, '/'));

    new WriteCommandAction.Simple(getProject()) {
      @Override
      protected void run() throws Throwable {
        PsiTestUtil.addContentRoot(myModule, root);

        VirtualFile newFile = createChildData(root, "New.java");
        setFileText(newFile, "class A{ Exception e;} //todo");
      }
    }.execute().throwException();

    PsiDocumentManager.getInstance(myProject).commitAllDocuments();

    PsiTodoSearchHelper.SERVICE
        .getInstance(myProject)
        .findFilesWithTodoItems(); // to initialize caches

    PsiTestUtil.addSourceRoot(myModule, root);

    PsiClass exceptionClass =
        myJavaFacade.findClass("java.lang.Exception", GlobalSearchScope.allScope(getProject()));
    assertNotNull(exceptionClass);
    checkUsages(exceptionClass, new String[] {"1.java", "2.java", "New.java"});
    checkTodos(new String[] {"2.java", "New.java"});
  }
  private void checkTodos(@NonNls String[] expectedFiles) {
    PsiTodoSearchHelper helper = PsiTodoSearchHelper.SERVICE.getInstance(myProject);

    PsiFile[] files = helper.findFilesWithTodoItems();

    assertEquals(expectedFiles.length, files.length);

    Arrays.sort(files, (file1, file2) -> file1.getName().compareTo(file2.getName()));
    Arrays.sort(expectedFiles);

    for (int i = 0; i < expectedFiles.length; i++) {
      String name = expectedFiles[i];
      PsiFile file = files[i];
      assertEquals(name, file.getName());
    }
  }