[PATCH 1 of 2 STABLE] hghave.py: make Hypothesis testing more sensitive

[timeless]

# HG changeset patch
# User timeless <timeless at mozdev.org>
# Date 1457447490 0
#      Tue Mar 08 14:31:30 2016 +0000
# Branch stable
# Node ID 7ff966bbfb67fd81003a15748bf2cab91cf59065
# Parent  8949d73b2e1f5c0b9c4c6c195bef2fe284349c6e
hghave.py: make Hypothesis testing more sensitive

On my system, I have some Hypothesis, but apparently not a working version,
thus the tests fail:

test-encoding.t.err
@@ -278,8 +278,9 @@
 #if hypothesis

   >>> from hypothesishelpers import *
+  ImportError('No module named settings',)
   >>> from mercurial import encoding
   >>> roundtrips(st.binary(), encoding.fromutf8b, encoding.toutf8b)
-  Round trip OK
+  NameError("name 'roundtrips' is not defined",)

 #endif

diff --git a/tests/hghave.py b/tests/hghave.py
--- a/tests/hghave.py
+++ b/tests/hghave.py
@@ -474,6 +474,7 @@
     try:
         import hypothesis
         hypothesis.given
+        import hypothesis.settings
         return True
     except ImportError:
         return False