diff --git a/.gitignore b/.gitignore
index 247392d..944dcb3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,6 +18,7 @@ build/
 dist/
 .coverage
 src/escpos/version.py
+.hypothesis
 
 # testing temporary directories
 test/test-cli-output/
diff --git a/.travis.yml b/.travis.yml
index e4d4f6e..76794ac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,6 +28,7 @@ matrix:
   allow_failures:
     - python: 3.5-dev
     - python: nightly
+    - python: pypy3
 before_install:
     - pip install tox codecov
 script:
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index a8d0d63..1ace354 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -2,6 +2,19 @@
 Changelog
 *********
 
+2016-??-?? - Version 2.1.? - "Contents May Differ"
+--------------------------------------------------
+
+changes
+^^^^^^^
+- rename variable interface in USB-class to timeout
+- add support for hypothesis and move pypy3 to the allowed failures (pypy3 is not supported by hypothesis)
+
+contributors
+^^^^^^^^^^^^
+- Patrick Kanzler
+- Renato Lorenzi
+
 2016-07-23 - Version 2.1.0 - "But Who's Counting?"
 --------------------------------------------------
 
diff --git a/codecov.yml b/codecov.yml
index 50302f9..3f03c93 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -1,4 +1,16 @@
+codecov:
+  bot: patkan
+
 coverage:
+  status:
+    project:
+      default:  # status context
+        target: auto
+        threshold: "1%"
+    patch:
+      default:
+        target: auto
+        threshold: "1%"
   range: "60...100"
 
 comment: off
diff --git a/setup.py b/setup.py
index 7a3895b..0e3eea5 100755
--- a/setup.py
+++ b/setup.py
@@ -116,7 +116,7 @@ setup(
     setup_requires=[
         'setuptools_scm',
     ],
-    tests_require=['tox', 'nose', 'scripttest'],
+    tests_require=['tox', 'nose', 'scripttest', 'mock', 'hypothesis'],
     cmdclass={'test': Tox},
     entry_points={
         'console_scripts': [
diff --git a/src/escpos/printer.py b/src/escpos/printer.py
index 41c674f..1ee1db7 100644
--- a/src/escpos/printer.py
+++ b/src/escpos/printer.py
@@ -34,18 +34,18 @@ class Usb(Escpos):
 
     """
 
-    def __init__(self, idVendor, idProduct, interface=0, in_ep=0x82, out_ep=0x01, *args, **kwargs):
+    def __init__(self, idVendor, idProduct, timeout=0, in_ep=0x82, out_ep=0x01, *args, **kwargs):
         """
         :param idVendor: Vendor ID
         :param idProduct: Product ID
-        :param interface: USB device interface
+        :param timeout: Is the time limit of the USB operation. Default without timeout.
         :param in_ep: Input end point
         :param out_ep: Output end point
         """
         Escpos.__init__(self, *args, **kwargs)
         self.idVendor = idVendor
         self.idProduct = idProduct
-        self.interface = interface
+        self.timeout = timeout
         self.in_ep = in_ep
         self.out_ep = out_ep
         self.open()
@@ -82,7 +82,7 @@ class Usb(Escpos):
         :param msg: arbitrary code to be printed
         :type msg: bytes
         """
-        self.device.write(self.out_ep, msg, self.interface)
+        self.device.write(self.out_ep, msg, self.timeout)
 
     def close(self):
         """ Release USB interface """
diff --git a/tox.ini b/tox.ini
index b1dee64..0968270 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,8 @@ envlist = py27, py34, py35, docs
 deps = nose
        coverage
        scripttest
+       mock
+       hypothesis
 commands = nosetests --with-coverage --cover-erase --cover-branches
 
 [testenv:docs]