Thank you very much. Just reading the comments on that url, I found the reason of my problem.
It was here:
--- coverage.py
+++ coverage.py
@@ -464,6 +464,8 @@
def collect(self):
cache_dir, local = os.path.split(s elf.cache)
+ if not cache_dir: #this two strings was upsent
+ cache_dir = "."
for file in os.listdir(cach e_dir):
if not file.startswith (local):
continue
With best regards, Orin