В пустой папке запускаю nosetest --with-coverage и получаю:
$ nosetests --with-coverage
Name Stmts Miss Cover Missing
---------------------------------------------------------------------------
/usr/share/pyshared/coverage/collector 132 127 4% 3-229, 236-244, 248-292
/usr/share/pyshared/coverage/control 236 235 1% 3-355, 358-624
/usr/share/pyshared/nose/core 156 134 14% 3-32, 35, 40, 46, 52, 57, 64-171, 181, 185, 196, 198-324
/usr/share/pyshared/nose/importer 92 76 17% 7-21, 23, 26-123, 132, 137, 146-147, 151-154
/usr/share/pyshared/nose/loader 342 295 14% 9-59, 80, 87-88, 98-124, 141-174, 178, 182-186, 191, 194-334, 349, 362-373, 377-403, 409-417, 428-441, 449, 455-594
/usr/share/pyshared/nose/plugins/cover 178 174 2% 13-63, 65-69, 71-161, 167-308
/usr/share/pyshared/nose/plugins/errorclass 65 59 9% 95-147, 149, 156-210
/usr/share/pyshared/nose/plugins/manager 260 229 12% 47-82, 85-86, 93, 96, 104-105, 108, 120, 125-141, 145-158, 164-166, 174-178, 182-240, 248-446
/usr/share/pyshared/nose/proxy 111 95 14% 18-29, 31-42, 44, 49, 61, 63, 67-77, 79, 85-190
/usr/share/pyshared/nose/pyversion 78 77 1% 4-55, 61-130
/usr/share/pyshared/nose/result 131 119 9% 11-36, 42, 46-100, 107, 112-198
/usr/share/pyshared/nose/selector 134 113 16% 9-34, 36, 39, 47-221, 223, 230-231, 243-250
/usr/share/pyshared/nose/suite 394 302 23% 10-49, 54-66, 70, 72-74, 77, 81-92, 99-101, 109-110, 115-145, 151, 159-175, 178-196, 206, 209-214, 218-219, 228-267, 271-272, 274-275, 281-321, 328-370, 375-392, 394, 397, 408, 424-425, 428-455, 457, 464-467, 472, 477-484, 487-537, 540-541, 547-550, 556-604
/usr/share/pyshared/nose/util 350 319 9% 3-139, 150-180, 200, 203, 207-242, 275-335, 354-481, 487, 489, 492, 496, 510-512, 516, 528, 532,538-663
---------------------------------------------------------------------------
TOTAL 2659 2354 11%
----------------------------------------------------------------------
Ran 0 tests in 0.001s
OK