input: Write a function to generate a voltage signal with random noise using a Python script. The function should accept two parameters: frequency and amplitude. The generated voltage signal should be composed of a sine wave at the given frequency and amplitude, with added Gaussian noise.
  assert generate_voltage_signal(250, 1)
  assert generate_voltage_signal(100, 2)
output: import numpy as np
  
  def generate_voltage_signal(frequency, amplitude):
      t = np.linspace(0, 1, 1000)
      sine_wave = amplitude * np.sin(2 * np.pi * frequency * t)
      noise = np.random.normal(0, 0.1, sine_wave.shape)
      return sine_wave + noise