code: def dummy_sample(self):
      batch_size = 4
      num_channels = 3
      height = 8
      width = 8
  
      key1, key2 = random.split(random.PRNGKey(0))
      sample = random.uniform(
          key1, (batch_size, num_channels, height, width)
      )
  
      return sample, key2
  
imports: import inspect
  import tempfile
  import unittest
  from typing import Dict, List, Tuple
  from diffusers import FlaxDDIMScheduler, FlaxDDPMScheduler, FlaxPNDMScheduler
  from diffusers.utils import is_flax_available
  from diffusers.utils.testing_utils import require_flax
label_desc: Use image node_id 1 for calling the FlaxSchedulerCommonTest obj's underlying member method code with example usage: obj.dummy_sample() and returns: sample,  key2