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@ -62,4 +62,37 @@ func TestGCounter(t *testing.T) {
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t.Fatalf("new gcounter has count of %d, should be 7", n)
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t.Fatalf("new gcounter has count of %d, should be 7", n)
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}
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}
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})
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})
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t.Run("merge", func(t *testing.T) {
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type hostname string
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host1 := NewGCounter[hostname]()
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host2 := NewGCounter[hostname]()
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host1.Add("host1", 3)
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host2.Add("host2", 6)
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host2.MergeInto(&host1)
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if n := host1.Total(); n != 9 {
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t.Errorf("merging once produced %d instead of 9", n)
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}
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host2.MergeInto(&host1)
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if n := host1.Total(); n != 9 {
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t.Errorf("merging a second time changed the target")
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}
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if n := host2.Total(); n != 6 {
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t.Errorf("merging changed the source")
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}
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host1.MergeInto(&host2)
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if host1.Total() != host2.Total() {
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t.Errorf("merging both ways didn't converge")
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}
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host2.Incr("host2")
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if host1.Total() == host2.Total() {
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t.Errorf("improper post-merge mutation")
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}
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})
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}
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}
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