tests: pass settings of hypothesis by with statement
given(..., settings=) is no longer available in Hypothesis 2.0.0.
https://github.com/DRMacIver/hypothesis/commit/7712c01
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ ls
a
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg co 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
B should disappear
$ ls
a