Test that a healthy node-engine passes at two minutes on one reading

cmd/mesh-controller/gate_rule_test.go

@@ -217,6 +217,11 @@ func TestAHealthyNodeEngineIsNeverHeldPastTwoMinutes(t *testing.T) {
 	if g.Verdict != inventory.GatePassed || g.Passes != 2 {
 		t.Fatalf("late readings, healthy throughout, at two minutes: %+v; want passed on two", g)
 	}
+	g, judge = threeReadings(t, "mesh-host", time.Now())
+	judge(2*time.Minute, healthGood)
+	if g.Verdict != inventory.GatePassed || g.Passes != 1 {
+		t.Fatalf("one healthy reading, at two minutes: %+v; want passed on it", g)
+	}
 }
 
 // A reading not yet healthy before the first healthy one is the build still starting: the two minutes still hold.