def setUp(self):
super(InstallTest, self).setUp()
# create a simple installable package directory and tarball
self.repo = MockArchive()
# We use a fake package, so skip the checksum.
spack.do_checksum = False
# Use a fake install directory to avoid conflicts bt/w
# installed pkgs and mock packages.
self.tmpdir = tempfile.mkdtemp()
self.orig_layout = spack.install_layout
spack.install_layout = YamlDirectoryLayout(self.tmpdir)
