Mis-configured combine paths produce useless results · Issue #608 · nedbat/coveragepy (original) (raw)

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Description

$ mkdir code code/sub
$ cat > code/sub/mod.py
print("Hello")
$ cat > .coveragerc
[paths]
source =
  code/sub
  code
$ coverage run --parallel code/sub/mod.py
Hello
$ cat .coverage.dhcp-18-189-21-130.dyn.mit.edu.983.832948
!coverage.py: This is a private format, don't read it directly!{"lines":{"/Users/ned/foo/jbug2/code/sub/mod.py":[1]}}
$ coverage combine
$ cat .coverage
!coverage.py: This is a private format, don't read it directly!{"lines":{"/Users/ned/foo/jbug2/code/sub/sub/mod.py":[1]}}
$ coverage report
code/sub/sub/mod.py   NoSource: No source for code: '/Users/ned/foo/jbug2/code/sub/sub/mod.py'.
Aborting report output, consider using -i.
Name    Stmts   Miss  Cover
---------------------------
No data to report.

The combine paths overlap. This should be an error. In the real situation, the overlap was mistakenly created by having paths with environment variables in them, and one of the variables was empty by mistake.

• Bitbucket: https://bitbucket.org/ned/coveragepy/issue/608