fix: combine aliases on windows base dirs (ie: X:\) (fixes: #577)

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

coverage/files.py

@@ -359,17 +359,19 @@ def add(self, pattern, result):
         match an entire tree, and not just its root.
 
         """
+        pattern_sep = sep(pattern)
+
         if len(pattern) > 1:
             pattern = pattern.rstrip(r"\/")
 
         # The pattern can't end with a wildcard component.
         if pattern.endswith("*"):
             raise CoverageException("Pattern must not end with wildcards.")
-        pattern_sep = sep(pattern)
 
         # The pattern is meant to match a filepath.  Let's make it absolute
         # unless it already is, or is meant to match any prefix.
-        if not pattern.startswith('*') and not isabs_anywhere(pattern):
+        if not pattern.startswith('*') and not isabs_anywhere(pattern +
+                                                              pattern_sep):
             pattern = abs_file(pattern)
         if not pattern.endswith(pattern_sep):
             pattern += pattern_sep

coverage/misc.py

@@ -32,7 +32,11 @@ def isolate_module(mod):
     if mod not in ISOLATED_MODULES:
         new_mod = types.ModuleType(mod.__name__)
         ISOLATED_MODULES[mod] = new_mod
-        for name in dir(mod):
+        attributes = dir(mod)
+        if mod.__name__ == "sys":
+            attributes = set(attributes) - set(["__stdout__", "__stdin__",
+                                               "stdout", "stdin"])
+        for name in attributes:
             value = getattr(mod, name)
             if isinstance(value, types.ModuleType):
                 value = isolate_module(value)