Add ping to network panel

test/shell.d/network-test.sh

@@ -37,8 +37,41 @@ assertDeepEqual(
   'network computes throughput deltas'
 )
 
+let ping = network.pingLatencyState(
+  { pingIface: '', routerPingSamples: [], internetPingSamples: [] },
+  { iface: 'wlan0', router_ping_ms: '2.0', internet_ping_ms: '20.0' },
+  4
+)
+assertDeepEqual(
+  ping,
+  { pingIface: 'wlan0', routerPingSamples: [2], internetPingSamples: [20], routerPingLatency: 2, internetPingLatency: 20 },
+  'network seeds ping latency samples'
+)
+
+ping = network.pingLatencyState(ping, { iface: 'wlan0', router_ping_ms: '4.0', internet_ping_ms: '' }, 4)
+assertDeepEqual(
+  ping,
+  { pingIface: 'wlan0', routerPingSamples: [2, 4], internetPingSamples: [20, null], routerPingLatency: 3, internetPingLatency: 20 },
+  'network averages recent successful ping samples'
+)
+
+assertDeepEqual(
+  network.pingLatencyState(ping, { iface: 'eth0', router_ping_ms: '1.5', internet_ping_ms: '10.0' }, 4),
+  { pingIface: 'eth0', routerPingSamples: [1.5], internetPingSamples: [10], routerPingLatency: 1.5, internetPingLatency: 10 },
+  'network resets ping samples when interface changes'
+)
+
+assertDeepEqual(
+  network.pingLatencyState(ping, { iface: 'wlan0', internet_ping_ms: '22.0' }, 4),
+  { pingIface: 'wlan0', routerPingSamples: [], internetPingSamples: [20, null, 22], routerPingLatency: -1, internetPingLatency: 21 },
+  'network clears ping samples when a target is unavailable'
+)
+
 assertEqual(network.formatBytes(1536), '1.5 KB', 'network formats bytes')
 assertEqual(network.formatRate(1536), '1.5 KB/s', 'network formats rates')
+assertEqual(network.formatPingLatency('2.54'), '2.5 ms', 'network formats low ping with precision')
+assertEqual(network.formatPingLatency('25.4'), '25 ms', 'network formats ping')
+assertEqual(network.formatPingLatency(''), 'Timeout', 'network formats missing ping as timeout')
 
 const rows = network.sortWifiRows([
   { ssid: 'Open', connected: false, known: false, signal: 95 },