code: def test_system_memory_gauge(self):
      # given
      gauge = SystemMemoryUsageGauge()
  
      # when
      memory_gb = gauge.value()
  
      # then
      self.assertGreater(memory_gb, 0)
      self.assertLess(memory_gb, self.system_memory_gb)
      self.assertEqual(float, type(memory_gb))
  
file_path: neptune-client/tests/unit/neptune/legacy/internal/hardware/gauges/test_memory_gauges.py
imports: import unittest
  import psutil
  from neptune.common.hardware.gauges.gauge_factory import CGroupMemoryUsageGauge, SystemMemoryUsageGauge
label_desc: Use image node_id 2 for calling the TestMemoryGauges obj's underlying member method code with example usage: obj.test_system_memory_gauge() without return types