Non-existent filename triggers AttributeError.

[nedbat]

Originally reported by Julian O (Bitbucket: oddthinking, GitHub: oddthinking)

---

Running coverage on a non-existent file gives a meaningful error message, and then signs off with an unexpected exception report.

I hope the following test case says it all:

> coverage run a_file_that_does_not_exist
No file to run: 'a_file_that_does_not_exist'
Exception AttributeError: "'NoneType' object has no attribute 'isabs'" in <function _remove at 0x026E23F0> ignored

> ver
Microsoft Windows [Version 6.0.6002]

> python --version
Python 2.7.1

> coverage --version
Coverage.py, version 3.5.1.  http://nedbatchelder.com/code/coverage

Obviously, this isn't a big problem, but worth noting.

---

• Bitbucket: https://bitbucket.org/ned/coveragepy/issue/153

[nedbat]

Original comment by Brodie Rao (Bitbucket: brodie, GitHub: brodie)

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On a somewhat related note, I'm seeing this exact warning when running the Mercurial test suite with coverage 3.5.2. As far as I know, Mercurial's test runner doesn't try to run non-existent tests.

I don't fully understand what's going on, but I've bisected the problem down to this commit: https://bitbucket.org/ned/coveragepy/changeset/edfe23dc34d3

Again, I have no idea what I'm doing, but this seemingly silly change gets rid of the problem:

#!diff
diff --git a/coverage/html.py b/coverage/html.py
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -2,7 +2,7 @@
 
 import os, re, shutil, sys
 
-import coverage
+from coverage import __url__, __version__
 from coverage.backward import pickle
 from coverage.misc import CoverageException, Hasher
 from coverage.phystokens import source_token_lines, source_encoding
@@ -46,8 +46,8 @@ class HtmlReporter(Reporter):
         self.directory = None
         self.template_globals = {
             'escape': escape,
-            '__url__': coverage.__url__,
-            '__version__': coverage.__version__,
+            '__url__': __url__,
+            '__version__': __version__,
             }
         self.source_tmpl = Templite(
             data("htmlfiles/pyfile.html"), self.template_globals
@@ -287,7 +287,7 @@ class HtmlStatus(object):
             usable = True
             if status['format'] != self.STATUS_FORMAT:
                 usable = False
-            elif status['version'] != coverage.__version__:
+            elif status['version'] != __version__:
                 usable = False
 
         if usable:
@@ -301,7 +301,7 @@ class HtmlStatus(object):
         status_file = os.path.join(directory, self.STATUS_FILE)
         status = {
             'format': self.STATUS_FORMAT,
-            'version': coverage.__version__,
+            'version': __version__,
             'settings': self.settings,
             'files': self.files,
             }

[nedbat]

Fixed in <<changeset 02e92889a5eb (bb)>>.