TST: move Styler format tests to own module

[attack68]

The following tests moved from style/test_style.py to their own module style/test_format.py.

def test_display_format(styler):
def test_format_dict(styler):
def test_format_string(styler): [added new]
def test_format_callable(styler): [added new]
def test_format_with_na_rep():
def test_format_non_numeric_na():
def test_format_clear(styler):
def test_format_escape():
def test_format_escape_na_rep():
def test_format_escape_floats(styler):
def test_format_raises(styler, formatter):
def test_format_with_precision():
def test_format_subset():

The new module does not use class setup structure.

[pep8speaks]

Hello @attack68! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file pandas/tests/io/formats/style/test_format.py:

Line 32:89: E501 line too long (91 > 88 characters)
Line 34:89: E501 line too long (97 > 88 characters)
Line 38:89: E501 line too long (98 > 88 characters)
Line 43:89: E501 line too long (120 > 88 characters)
Line 72:89: E501 line too long (90 > 88 characters)

[attack68]

Hello @attack68! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file pandas/tests/io/formats/style/test_format.py:

Line 32:89: E501 line too long (91 > 88 characters)
Line 34:89: E501 line too long (97 > 88 characters)
Line 38:89: E501 line too long (98 > 88 characters)
Line 43:89: E501 line too long (120 > 88 characters)
Line 72:89: E501 line too long (90 > 88 characters)

This is quite odd since these lines are not long and don't have more than 88 chars in them!?

[jreback]

Hello @attack68! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file pandas/tests/io/formats/style/test_format.py:

Line 32:89: E501 line too long (91 > 88 characters)
Line 34:89: E501 line too long (97 > 88 characters)
Line 38:89: E501 line too long (98 > 88 characters)
Line 43:89: E501 line too long (120 > 88 characters)
Line 72:89: E501 line too long (90 > 88 characters)

This is quite odd since these lines are not long and don't have more than 88 chars in them!?

maybe the bot is having an off day :-<

[jreback]

thanks @attack68