def test_do_not_split_at_carret():
# do not split at '^'
s = 'a' * 19 + '^Ixxx^'
chunks = split_mtext_string(s, 20)
assert 2 == len(chunks)
assert chunks[0] == 'a' * 19
assert chunks[1] == '^Ixxx^'
def test_do_not_split_at_caret():
# do not split at '^'
chunks = split_mtext_string('a' * 19 + '^Ixxx^', 20)
assert len(chunks) == 2
assert chunks[0] == 'a' * 19
assert chunks[1] == '^Ixxx^'
def test_split_longer_string():
chunks = split_mtext_string(TESTSTR * 4, 20)
assert len(chunks) == 2
assert chunks[0] == TESTSTR * 2
assert chunks[1] == TESTSTR * 2
def test_split_long_string():
chunks = split_mtext_string(TESTSTR * 3, 20)
assert len(chunks) == 2
assert TESTSTR * 2 == chunks[0]
assert TESTSTR == chunks[1]
def test_split_short_string():
chunks = split_mtext_string(TESTSTR, 20)
assert len(chunks) == 1
assert TESTSTR == chunks[0]
def test_split_empty_string():
chunks = split_mtext_string('', 20)
assert len(chunks) == 0
def test_long_string_2():
s = TESTSTR * 4
chunks = split_mtext_string(s, 20)
assert 2 == len(chunks)
assert TESTSTR * 2 == chunks[0]
assert TESTSTR * 2 == chunks[1]
def test_short_string():
s = TESTSTR
chunks = split_mtext_string(s, 20)
assert 1 == len(chunks)
assert TESTSTR == chunks[0]
def test_empty_string():
s = ""
chunks = split_mtext_string(s, 20)
assert 0 == len(chunks)
