extractors loaded for unrelated tests

[williballenthin]

in fixtures.py at the top level, we call get_*_extractor for a selection of samples to compute their hashes. because this is at the top level, this is done at import time, rather then when the relevant test is invoked. this slows down the invocation of other tests.

capa/tests/fixtures.py

Lines 668 to 670 in 19495f6

	get_pefile_extractor(get_data_path_by_name("mimikatz")),
	SampleHashes(
	md5="5f66b82558ca92e54e77f216ef4c066c",

[williballenthin]

since these fixtures aren't used by more than one test, they can be just as easily embedded in the single test file

[yelhamer]

Good call! Thank you!

[yelhamer]

fixed in #1708