#21206: Misleading Exception on emty test class: ImportError: Start directory is
not importable
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Reporter: thepapermen | Owner: nobody
Type: Bug | Status: new
Component: Testing framework | Version: 1.6-beta-1
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by carljm):
Yeah, on a closer look, you're right. Although this error message is
reproducible with `python -m unittest discover path.to.EmptyTestCase`,
it's not tied to an empty test case; it's simply because in unittest
"discover" does not accept dotted paths to test case classes, only file
paths or dotted package paths to start discovery at. Django's discovery
runner attempts to combine unittest's discovery ability with its ability
to load tests directly from a dotted module / testcase path, by
autodetecting which one each provided test label is, and the bug here lies
in that autodetection. We assume that if we try `loadTestsFromName` and no
tests are found, that the given label must have been a package instead,
and so we try discovery. When the given label was in fact an empty test
case class, this error occurs.
In order to fix this, we'll need to do some further checks in the `if not
(tests and tests.countTestCases())` block to verify that the provided
label actually maps to a package before we try discovery on it.
--
Ticket URL: <https://code.djangoproject.com/ticket/21206#comment:5>
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