DRY _tabs method in tests

tests/openwrt/test_network.py

@@ -1,18 +1,13 @@
 import unittest
-
 from netjsonconfig import OpenWrt
 
+from .utils import _TabsMixin
+
 
-class TestNetworkRendererer(unittest.TestCase):
+class TestNetworkRendererer(unittest.TestCase, _TabsMixin):
     """
     tests for backends.openwrt.renderers.NetworkRendererer
     """
-    def _tabs(self, string):
-        """
-        replace 4 spaces with 1 tab
-        """
-        return string.replace('    ', '\t')
-
     def test_loopback(self):
         o = OpenWrt({
             "type": "DeviceConfiguration",

tests/openwrt/test_system.py

@@ -1,18 +1,13 @@
 import unittest
-
 from netjsonconfig import OpenWrt
 
+from .utils import _TabsMixin
+
 
-class TestSystemRendererer(unittest.TestCase):
+class TestSystemRendererer(unittest.TestCase, _TabsMixin):
     """
     tests for backends.openwrt.renderers.SystemRendererer
     """
-    def _tabs(self, string):
-        """
-        replace 4 spaces with 1 tab
-        """
-        return string.replace('    ', '\t')
-
     def test_system(self):
         o = OpenWrt({
             "type": "DeviceConfiguration",

tests/openwrt/test_wireless.py

@@ -1,18 +1,13 @@
 import unittest
-
 from netjsonconfig import OpenWrt
 
+from .utils import _TabsMixin
+
 
-class TestWirelessRendererer(unittest.TestCase):
+class TestWirelessRendererer(unittest.TestCase, _TabsMixin):
     """
     tests for backends.openwrt.renderers.WirelessRendererer
     """
-    def _tabs(self, string):
-        """
-        replace 4 spaces with 1 tab
-        """
-        return string.replace('    ', '\t')
-
     def test_radio(self):
         o = OpenWrt({
             "type": "DeviceConfiguration",

tests/openwrt/utils.py

@@ -0,0 +1,10 @@
+class _TabsMixin(object):
+    """
+    mixin that adds _tabs method to test classes
+    """
+    def _tabs(self, string):
+        """
+        replace 4 spaces with 1 tab
+        """
+        return string.replace('    ', '\t')
+