def test_empty():
counts = count_chars('')
assert counts == {}
def test_common():
counts = count_chars('abbcccddddeeeee')
assert counts == {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}
def test_wrong_type():
with pytest.raises(TypeError):
count_chars(42)
def test_common():
counts = count_chars('aabccc')
assert counts == {'a': 2, 'b': 1, 'c': 3}
def test_empty():
assert count_chars('aabbb') == {'a': 2, 'b': 3}
def test_empty():
assert count_chars("") == {}
def test_single_char():
counts = count_chars('a')
assert counts == {'a': 1}
def test_default():
assert count_chars("hi") == {"h": 1, "i": 1}
def test_digits():
assert count_chars("hello1231") == {
"h": 1, "e": 1, "l": 2, "o": 1,
"1": 2, "2": 1, "3": 1
}
def test_many_letters():
assert count_chars('ddddddddd') == {'d': 9}
def test_wrong_type_list():
with pytest.raises(TypeError):
count_chars(['g', 'd', 's'])
def test_count_chars():
assert count_chars('mnnp') == {'m': 1, 'n': 2, 'p': 1}
