def test_split_on_newline(self):
result = str_to_set('a\nb\nc')
assert len(result) == 3
assert 'a' in result
assert 'b' in result
assert 'c' in result
def test_split_on_space(self):
result = str_to_set('a b c')
assert len(result) == 3
assert 'a' in result
assert 'b' in result
assert 'c' in result
def test_split_on_comma(self):
result = str_to_set('a,b,c')
assert len(result) == 3
assert 'a' in result
assert 'b' in result
assert 'c' in result
def test_split_on_mixed_separators(self):
input = """a,b c,d
e
f
g h , i j
"""
result = str_to_set(input)
assert len(result) == 10
assert 'a' in result
assert 'b' in result
assert 'c' in result
assert 'd' in result
assert 'e' in result
assert 'f' in result
assert 'g' in result
assert 'h' in result
assert 'i' in result
assert 'j' in result
def test_returns_no_duplicates(self):
result = str_to_set('a a a')
assert len(result) == 1
assert 'a' in result
def test_empty_input_returns_empty_set(self):
result = str_to_set('')
assert type(result) == set
assert len(result) == 0
def test_returns_set(self):
result = str_to_set('abc')
assert type(result) == set
assert len(result) == 1
assert 'abc' in result