test: initialize hardware before cpu_load detection assertion

Deferred hardware setup in PR 1 requires _ensure_hardware_ready() in tests
that inspect tracker._hardware before start().

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: davidberenstein1957

tests/test_cpu_load.py

@@ -49,13 +49,18 @@ def test_cpu_total_power(
         self.assertEqual(power.W, 50)
         self.assertEqual(cpu.total_power().W, 50)
 
+    @mock.patch(
+        "codecarbon.core.powermetrics.is_powermetrics_available", return_value=False
+    )
     def test_cpu_load_detection(
         self,
+        mocked_is_powermetrics_available,
         mocked_is_psutil_available,
         mocked_is_powergadget_available,
         mocked_is_rapl_available,
     ):
         tracker = OfflineEmissionsTracker(country_iso_code="FRA")
+        tracker._ensure_hardware_ready()
         for hardware in tracker._hardware:
             if (
                 isinstance(hardware, CPU) and hardware._mode == MODE_CPU_LOAD