Allow overriding the local test channel

[farshidtz]

This makes it possible to override the default channel when running tests locally. It was already possible via the checkbox-edgexfoundry snap.

This is useful for testing edge or branches.

[farshidtz]

I also noticed DEFAULT_TEST_CHANNEL=${DEFAULT_TEST_CHANNEL:-beta} in some test scripts. I didn't remove because it maybe needed by checkbox-edgexfoundry snap when default is not set.

[MonicaisHer]

sudo DEFAULT_TEST_CHANNEL="latest/edge" ./run-all-tests-locally.sh -t test-refresh-services.sh

testing snap from channel: latest/edge
running single test: test-refresh-services.sh ...   FAILED:
snap "edgexfoundry" is not installed
Installing snap from channel
edgexfoundry (2.0/stable) 2.0.0-4 from Canonical* installed
Installed edgexfoundry  2.0.0-4  3328  2.0/stable  canonical*  -
waiting for all services to come online. Current retry count: 0/300
waiting for all services to come online. Current retry count: 1/300
waiting for all services to come online. Current retry count: 2/300
all services up
error: cannot install snap file: cannot refresh "edgexfoundry" to new revision
       3520 with epoch 6, because it can't read the current epoch of 5

[siggiskulason]

Yes, I get the same result as @MonicaisHer - I think it's perhaps because run-all-tests-locally downloads the latest snap from the specified channel. We can't refresh directly to that, as we first need to refresh to the bridge snap, so

snap refresh edgexfoundry --channel=latest/edge would work but

snap_download_and_ack edgexfoundry --channel=latest/edge
snap install edgexfoundry_.snap --devmode

would not.

So we need really to update run-all-tests-locally to not download the snap if a channel is specified.

changing line 104 from

REVISION_TO_TEST=$(snap_download_and_ack edgexfoundry --channel=$EDGEX_LATEST_CHANNEL)

to

REVISION_TO_TEST=""

might do it?

[farshidtz]

Thanks. Good catch. I initially tested only with DEFAULT_TEST_CHANNEL=2.1/latest and didn't getting any error.