Fix flaky client::group::default test
The group command could be run before the `group add` command had
completed. Explicitly wait for the group to exist first.
@@ -15,6 +15,7 @@ async fn default() -> Result<()> {
// Add a group via the cli interface.
run_client_command(shared, &["group", "add", "testgroup", "--parallel=2"])?;
+ wait_for_group(shared, "testgroup").await?;
// Get the group status output
let output = run_client_command(shared, &["group"])?;
