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Klaus Aehlig authored
As discussed in the last commit, placing a new instance on the cluster can lead to a cluster that can be improved by moving previously added instances. For an empty cluster, however, there are no previous instances. So add this to the test description to make obvious why this test tests for a valid property. Signed-off-by: Klaus Aehlig <aehlig@google.com> Reviewed-by: Guido Trotter <ultrotter@google.com>
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