Introduce Chars

This improves the implementation by introducing a class to manage the characters

test/test_chars.py

+from typing import Iterable, List
+
+from hypothesis import given, settings, strategies as hst
+
+from src.ilp_keyboard_layout_optimization.data_aquisition.chars import (
+    Chars,
+)
+from src.ilp_keyboard_layout_optimization.type_aliases import CharTuple
+
+
+def test_chars_init():
+    assert Chars()
+
+
+def test_chars_chars_type():
+    assert isinstance(Chars().chars, str)
+
+
+def test_chars_char_tuple_type():
+    assert isinstance(Chars().char_tuple, CharTuple.__origin__)
+
+
+@given(hst.tuples(hst.text(min_size=1)))
+@settings(deadline=None)
+# TODO Fix this test, it is not generating what it is supposed to
+def test_chars_input_tuple(char_tuple):
+    assert Chars(char_tuple).chars == "".join(char_tuple)
+
+
+@given(hst.text(min_size=1))
+def test_chars_input_str(char_string):
+    assert Chars(char_string).chars == char_string
+
+
+@given(hst.text(min_size=1))
+def test_chars_input_tuple_equals_input_str(char_string):
+    char_tuple = Chars._str2char_tuple(char_string)
+    assert Chars(char_string).chars == Chars(char_tuple).chars
+
+
+@given(hst.text(min_size=1))
+def test_chars_input_str(char_string):
+    assert Chars(char_string).chars == char_string
+
+
+def test_chars_default():
+    all_test_chars = list(Chars().chars)
+    basic_latin = _get_unicode_chars(range(0x0021, 0x007F))
+    latin_1_supp = _get_unicode_chars(
+        (0x00C4, 0x00D6, 0x00DC, 0x00E4, 0x00F6, 0x00FC, 0x00DF)
+    )
+    general_punc = _get_unicode_chars((0x2013, 0x2026))
+    extended_alphabet = basic_latin + latin_1_supp + general_punc
+    for char in extended_alphabet:
+        all_test_chars.remove(char)
+    assert not all_test_chars
+
+
+def _get_unicode_chars(code_point_range: Iterable) -> List[str]:
+    return [chr(char) for char in code_point_range]
+
+
+@given(hst.text(min_size=1))
+def test_chars_monograms(char_string):
+    pass