mark env-related branches in tests as no cover

Author: tomato42

src/ecdsa/test_eddsa.py

@@ -664,7 +664,7 @@ def test_invalid_r_value(self):
 
 
 HYP_SETTINGS = dict()
-if "--fast" in sys.argv:
+if "--fast" in sys.argv:  # pragma: no cover
     HYP_SETTINGS["max_examples"] = 2
 else:
     HYP_SETTINGS["max_examples"] = 10

src/ecdsa/test_sha3.py

@@ -8,7 +8,7 @@
     from gmpy2 import mpz
 
     GMPY = True
-except ImportError:
+except ImportError:  # pragma: no cover
     try:
         from gmpy import mpz