code: def test_invalid_usage(self):
      with self.assertRaisesRegex(
          ValueError,
          "The negative_slope value of a Leaky ReLU layer cannot be None",
      ):
          self.run_layer_test(
              leaky_relu.LeakyReLU,
              init_kwargs={"negative_slope": None},
              input_shape=(2, 3, 4),
              supports_masking=True,
          )
  
file_path: keras/keras/layers/activations/leaky_relu_test.py
imports: import numpy
  import pytest
  from keras import testing
  from keras.layers.activations import leaky_relu
label_desc: Use image node_id 3 for calling the LeakyReLUTest obj's underlying member method code with example usage: obj.test_invalid_usage() without return types