LATENCY command / monitor basic tests.

tests/unit/latency-monitor.tcl

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+start_server {tags {"latency-monitor"}} {
+    # Set a threshold high enough to avoid spurious latency events.
+    r config set latency-monitor-threshold 200
+    r latency reset
+
+    test {Test latency events logging} {
+        r debug sleep 0.3
+        after 1100
+        r debug sleep 0.4
+        after 1100
+        r debug sleep 0.5
+        assert {[r latency history command] >= 3}
+    }
+
+    test {LATENCY HISTORY output is ok} {
+        set min 250
+        set max 450
+        foreach event [r latency history command] {
+            lassign $event time latency
+            assert {$latency >= $min && $latency <= $max}
+            incr min 100
+            incr max 100
+            set last_time $time ; # Used in the next test
+        }
+    }
+
+    test {LATENCY LATEST output is ok} {
+        foreach event [r latency latest] {
+            lassign $event eventname time latency max
+            assert {$eventname eq "command"}
+            assert {$max >= 450 & $max <= 650}
+            assert {$time == $last_time}
+            break
+        }
+    }
+
+    test {LATENCY HISTORY / RESET with wrong event name is fine} {
+        assert {[llength [r latency history blabla]] == 0}
+        assert {[r latency reset blabla] == 0}
+    }
+
+    test {LATENCY DOCTOR produces some output} {
+        assert {[string length [r latency doctor]] > 0}
+    }
+
+    test {LATENCY RESET is able to reset events} {
+        assert {[r latency reset] > 0}
+        assert {[r latency latest] eq {}}
+    }
+}