When the test runner receives SIGINT, osbuild's mounts stay around.
osbuild handles SIGING correctly, but it doesn't have time before being
killed because it's parent went away.
Fix this by waiting on it explicitly in the test runner.
Fixes#119
For stages testing it is too slow to rebuild the a image containing
@Core packages every time. Let's just reuse the a image for all tests.
This should speed up the test running time a LOT.
The stage testing is based on an output from the tree-diff tool. During
one test two pipelines are run and their outputs are compared using
tree-diff. The diff is then compared with expected diff included in
the repository.
The testosbuild.TestCase class creates a fresh store for each test,
because tests should run independent of each other.
This can lead to long waiting times while developing a new test case.
Allow overriding the store used with OSBUILD_TEST_STORE. This should
never be used where tests are actually run. It is a development-only
feature.
Use the unittest module from the standard library. Also, ensure that
separate runs of this test don't share a osbuild store and clean up
after themselves.
With contributions from Ondřej Budai and Tom Gundersen.
