add Gpu skip condition and setupclass in test_openclpow module

src/tests/test_openclpow.py

@@ -8,17 +8,23 @@ import pybitmessage.openclpow as openclpow
 
 from struct import pack, unpack
 
+from test_process import TestProcessProto
 
-class TestOpenClPow(unittest.TestCase):
+
+class TestOpenClPow(TestProcessProto):
     """
     Main opencl test case
     """
 
-    @unittest.skipIf(not openclpow.libAvailable,
-                     "pyopencl is not installed")
+    @classmethod
+    def setUpClass(cls):
+        openclpow.initCL()
+        super(TestOpenClPow, cls).setUpClass()
+
+    @unittest.skipIf(not openclpow.enabledGpus,
+                     "No GPUs found / enabled")
     def test_openclpow(self):
         """Check the working of openclpow module"""
-        openclpow.initCL()
         target_ = 54227212183
         initialHash = ("3758f55b5a8d902fd3597e4ce6a2d3f23daff735f65d9698c270987f4e67ad590"
                        "b93f3ffeba0ef2fd08a8dc2f87b68ae5a0dc819ab57f22ad2c4c9c8618a43b3").decode("hex")