Add interval refresh mode

tests/test_cli.py

@@ -1,14 +1,19 @@
+import io
 from pathlib import Path
 from tempfile import TemporaryDirectory
 import unittest
 
+from rich.console import Console
+
 from mm.cli import (
     GPUStat,
     MachineConfig,
     MachineResult,
+    build_parser,
     gpu_summary,
     load_machines,
     parse_nvidia_smi_csv,
+    render_dashboard,
 )
 
 
@@ -67,6 +72,18 @@ class NvidiaSmiParsingTests(unittest.TestCase):
 
 
 class RenderingTests(unittest.TestCase):
+    def test_render_dashboard_includes_last_refresh_time(self) -> None:
+        console = Console(
+            file=io.StringIO(),
+            record=True,
+            color_system=None,
+            width=120,
+        )
+
+        render_dashboard([], Path("list.yaml"), console, refreshed_at="12:34:56")
+
+        self.assertIn("last refresh: 12:34:56", console.export_text())
+
     def test_gpu_summary_uses_fixed_width_decimal_metrics(self) -> None:
         result = MachineResult(
             machine=MachineConfig(alias="dash0", label="dash0"),
@@ -82,5 +99,12 @@ class RenderingTests(unittest.TestCase):
         )
 
 
+class CLITests(unittest.TestCase):
+    def test_interval_flag_sets_refresh_interval(self) -> None:
+        args = build_parser().parse_args(["--interval", "15"])
+
+        self.assertEqual(args.interval, 15)
+
+
 if __name__ == "__main__":
     unittest.main()