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Add integration test covering for scaling down 3 node cluster #60

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Add integration test covering for scaling down 3 node cluster #60

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18 changes: 12 additions & 6 deletions tests/integration/test_k8s.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,22 +93,28 @@ async def test_remove_worker(kubernetes_cluster: model.Model):


@pytest.mark.abort_on_fail
async def test_remove_non_leader_control_plane(kubernetes_cluster: model.Model):
async def test_remove_non_leader_control_planes(kubernetes_cluster: model.Model):
"""Deploy the charm and wait for active/idle status."""
k8s = kubernetes_cluster.applications["k8s"]
worker = kubernetes_cluster.applications["k8s-worker"]
expected_nodes = len(k8s.units) + len(worker.units)
leader_idx = await get_leader(k8s)
leader = k8s.units[leader_idx]
follower = k8s.units[(leader_idx + 1) % len(k8s.units)]
followers = [unit for idx, unit in enumerate(k8s.units) if idx != leader_idx]
await ready_nodes(leader, expected_nodes)

# Remove a control-plane
log.info("Remove unit %s", follower.name)
await follower.destroy()
# Remove both non-leading control-planes (Replicate issue #277)
log.info("Remove unit %s", followers[0].name)
await followers[0].destroy()
await kubernetes_cluster.wait_for_idle(status="active", timeout=10 * 60)
await ready_nodes(leader, expected_nodes - 1)
await k8s.add_unit()

log.info("Remove unit %s", followers[1].name)
await followers[1].destroy()
await kubernetes_cluster.wait_for_idle(status="active", timeout=10 * 60)
await ready_nodes(leader, expected_nodes - 2)

await k8s.add_unit(count=2)
await kubernetes_cluster.wait_for_idle(status="active", timeout=10 * 60)
await ready_nodes(leader, expected_nodes)

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