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//usr/local/lib/python3.9/idlelib/idle_test/mock_idle.py

'''Mock classes that imitate idlelib modules or classes.

Attributes and methods will be added as needed for tests.
'''

from idlelib.idle_test.mock_tk import Text

class Func:
    '''Record call, capture args, return/raise result set by test.

When mock function is called, set or use attributes:
    self.called - increment call number even if no args, kwds passed.
    self.args - capture positional arguments.
    self.kwds - capture keyword arguments.
    self.result - return or raise value set in __init__.
    self.return_self - return self instead, to mock query class return.

Most common use will probably be to mock instance methods.
    Given class instance, can set and delete as instance attribute.
    Mock_tk.Var and Mbox_func are special variants of this.
    '''
    def __init__(self, result=None, return_self=False):
        self.called = 0
        self.result = result
        self.return_self = return_self
        self.args = None
        self.kwds = None
    def __call__(self, *args, **kwds):
        self.called += 1
        self.args = args
        self.kwds = kwds
        if isinstance(self.result, BaseException):
            raise self.result
        elif self.return_self:
            return self
        else:
            return self.result

class Editor:
    '''Minimally imitate editor.EditorWindow class.
    '''
    def __init__(self, flist=None, filename=None, key=None, root=None,
                 text=None):  # Allow real Text with mock Editor.
        self.text = text or Text()
        self.undo = UndoDelegator()

def get_selection_indices(self):
        first = self.text.index('1.0')
        last = self.text.index('end')
        return first, last

class UndoDelegator:
    '''Minimally imitate undo.UndoDelegator class.
    '''
    # A real undo block is only needed for user interaction.
    def undo_block_start(*args):
        pass
    def undo_block_stop(*args):
        pass