pytest -f does not notice new tests

[pytestbot]

Originally reported by: Dima Tisnek (BitBucket: dimaqq, GitHub: dimaqq)

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pytest -f appears to latch to the set of test cases on first run and does not detect when new test is added.

e.g. test_foo.py:
def test foo(): assert 0

run pytest -f test_foo.py
(one test failing)

edit test_foo.py, add
def test_bar(): assert 0
(still only one test failing)

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/532

[RonnyPfannschmidt]

this is a design failure, its also a issue in pytest-cache and should be tackled

[RonnyPfannschmidt]

closing as pytest-dev/pytest-xdist#111 is the followup