/**
  * Applies given caret/selection state to the editor. Editor text must have been set up
  * previously.
  */
 public static void setCaretsAndSelection(Editor editor, CaretAndSelectionState caretsState) {
   CaretModel caretModel = editor.getCaretModel();
   if (caretModel.supportsMultipleCarets()) {
     List<CaretState> states = new ArrayList<CaretState>(caretsState.carets.size());
     for (CaretInfo caret : caretsState.carets) {
       states.add(
           new CaretState(
               caret.position == null
                   ? null
                   : editor.offsetToLogicalPosition(caret.getCaretOffset(editor.getDocument())),
               caret.selection == null
                   ? null
                   : editor.offsetToLogicalPosition(caret.selection.getStartOffset()),
               caret.selection == null
                   ? null
                   : editor.offsetToLogicalPosition(caret.selection.getEndOffset())));
     }
     caretModel.setCaretsAndSelections(states);
   } else {
     assertEquals("Multiple carets are not supported by the model", 1, caretsState.carets.size());
     CaretInfo caret = caretsState.carets.get(0);
     if (caret.position != null) {
       caretModel.moveToOffset(caret.getCaretOffset(editor.getDocument()));
     }
     if (caret.selection != null) {
       editor
           .getSelectionModel()
           .setSelection(caret.selection.getStartOffset(), caret.selection.getEndOffset());
     } else {
       editor.getSelectionModel().removeSelection();
     }
   }
   if (caretsState.blockSelection != null) {
     editor
         .getSelectionModel()
         .setBlockSelection(
             editor.offsetToLogicalPosition(caretsState.blockSelection.getStartOffset()),
             editor.offsetToLogicalPosition(caretsState.blockSelection.getEndOffset()));
   }
 }
  public static void verifyCaretAndSelectionState(
      Editor editor, CaretAndSelectionState caretState, String message) {
    boolean hasChecks = false;
    for (int i = 0; i < caretState.carets.size(); i++) {
      EditorTestUtil.CaretInfo expected = caretState.carets.get(i);
      if (expected.position != null || expected.selection != null) {
        hasChecks = true;
        break;
      }
    }
    if (!hasChecks) {
      return; // nothing to check, so we skip caret/selection assertions
    }
    String messageSuffix = message == null ? "" : (message + ": ");
    CaretModel caretModel = editor.getCaretModel();
    List<Caret> allCarets = new ArrayList<Caret>(caretModel.getAllCarets());
    assertEquals(
        messageSuffix + " Unexpected number of carets", caretState.carets.size(), allCarets.size());
    for (int i = 0; i < caretState.carets.size(); i++) {
      String caretDescription =
          caretState.carets.size() == 1
              ? ""
              : "caret " + (i + 1) + "/" + caretState.carets.size() + " ";
      Caret currentCaret = allCarets.get(i);
      int actualCaretLine = editor.getDocument().getLineNumber(currentCaret.getOffset());
      int actualCaretColumn =
          currentCaret.getOffset() - editor.getDocument().getLineStartOffset(actualCaretLine);
      LogicalPosition actualCaretPosition = new LogicalPosition(actualCaretLine, actualCaretColumn);
      int selectionStart = currentCaret.getSelectionStart();
      int selectionEnd = currentCaret.getSelectionEnd();
      LogicalPosition actualSelectionStart = editor.offsetToLogicalPosition(selectionStart);
      LogicalPosition actualSelectionEnd = editor.offsetToLogicalPosition(selectionEnd);
      CaretInfo expected = caretState.carets.get(i);
      if (expected.position != null) {
        assertEquals(
            messageSuffix + caretDescription + "unexpected caret position",
            expected.position,
            actualCaretPosition);
      }
      if (expected.selection != null) {
        LogicalPosition expectedSelectionStart =
            editor.offsetToLogicalPosition(expected.selection.getStartOffset());
        LogicalPosition expectedSelectionEnd =
            editor.offsetToLogicalPosition(expected.selection.getEndOffset());

        assertEquals(
            messageSuffix + caretDescription + "unexpected selection start",
            expectedSelectionStart,
            actualSelectionStart);
        assertEquals(
            messageSuffix + caretDescription + "unexpected selection end",
            expectedSelectionEnd,
            actualSelectionEnd);
      } else {
        assertFalse(
            messageSuffix
                + caretDescription
                + "should has no selection, but was: ("
                + actualSelectionStart
                + ", "
                + actualSelectionEnd
                + ")",
            currentCaret.hasSelection());
      }
    }
  }