feat(webui,dashboard): add RAM Usage card between Disk Usage and Uptime, live-verified on Pager

tests/test_status.py

@@ -43,6 +43,20 @@ class StatusTest(unittest.TestCase):
         d = server.disk_data()
         self.assertEqual(d['avail'], 7364608 * 1024)
 
+    def test_mem_parses_meminfo(self):
+        import tempfile
+        base = tempfile.mkdtemp()
+        with open(os.path.join(base, 'meminfo'), 'w') as f:
+            f.write('MemTotal:        262144 kB\nMemFree:          102400 kB\nMemAvailable:    122880 kB\nBuffers:           20480 kB\n')
+        d = server.mem_data(os.path.join(base, 'meminfo'))
+        self.assertEqual(d['size'], 262144 * 1024)
+        self.assertEqual(d['used'], (262144 - 122880) * 1024)
+        self.assertEqual(d['avail'], 122880 * 1024)
+
+    def test_mem_missing_returns_empty(self):
+        import tempfile
+        self.assertEqual(server.mem_data(os.path.join(tempfile.mkdtemp(), 'nope')), {})
+
     def test_wifi_ifaces_extracts_names(self):
         server.device_run = lambda args, timeout=20: (0, 'wlan0    ESSID: "Pineapple"\nwlan1    ESSID: "Pineapple"\n', '') if args == ['iwinfo'] else (0, '', '')
         self.assertEqual(server.wifi_ifaces(), ['wlan0', 'wlan1'])
@@ -89,7 +103,7 @@ class StatusTest(unittest.TestCase):
             args = ()
         status, payload = server.h_status(Ctx())
         self.assertEqual(status, 200)
-        for k in ('battery', 'firmware', 'daemon', 'wifi', 'clients', 'disk', 'uptime', 'hostname'):
+        for k in ('battery', 'firmware', 'daemon', 'wifi', 'clients', 'disk', 'mem', 'uptime', 'hostname'):
             self.assertIn(k, payload)
 
     def test_status_discovers_wifi_interfaces_once(self):