completely fix tests

The feature use_coverage of hypothesis caused the failing tests, because
the printer_file_test is sensitive to the coverage analysis of
hypothesis.

Fixed by disabling use_coverage for the crashing tests

setup.py

@@ -132,7 +132,7 @@ setup(
         'nose',
         'scripttest',
         'mock',
-        'hypothesis<=3.28.3',
+        'hypothesis',
         'flake8'
     ],
     cmdclass={'test': Tox},

test/test_printer_file.py

@@ -27,6 +27,7 @@ else:
     mock_open_call = '__builtin__.open'
 
 
+@settings(use_coverage=False)
 @given(path=text())
 def test_load_file_printer(mocker, path):
     """test the loading of the file-printer"""
@@ -37,7 +38,7 @@ def test_load_file_printer(mocker, path):
     mock_open.assert_called_with(path, "wb")
 
 
-@settings(deadline=None)
+@settings(deadline=None, use_coverage=False)
 @given(txt=text())
 def test_auto_flush(mocker, txt):
     """test auto_flush in file-printer"""
@@ -58,7 +59,7 @@ def test_auto_flush(mocker, txt):
     assert mock_device.flush.called
 
 
-@settings(deadline=None)
+@settings(deadline=None, use_coverage=False)
 @given(txt=text())
 def test_flush_on_close(mocker, txt):
     """test flush on close in file-printer"""

tox.ini

@@ -10,7 +10,7 @@ deps = nose
        pytest!=3.2.0
        pytest-cov
        pytest-mock
-       hypothesis<=3.28.3
+       hypothesis
        viivakoodi
 commands = py.test --cov escpos