def test_getting_all_letters_empties_scanner(self):
s = TextScanner("w")
s.get()
assert s.is_empty is True
assert s.has_data is False
def test_scan_empty_text(self):
s = TextScanner("")
assert s.is_empty is True
assert s.has_data is False
assert s.peek() == "" # empty string signals end of text
assert s.get() == ""
def test_getting_next_letter_forwards_scan_position(self):
s = TextScanner("word")
assert s.get() == "w"
assert s.peek() == "o"
