docstr: ...Test HawkesKernelPowerLaw string representation
          
docstr_tok: ["...","Test","HawkesKernelPowerLaw","string","representation"]
code: def test_HawkesKernelPowerLaw_str(self):
      """...Test HawkesKernelPowerLaw string representation"""
      multiplier = 0.1
      cutoff = 0.01
      exponent = 1.2
      hawkes_kernel_power_law = HawkesKernelPowerLaw(
          multiplier, cutoff, exponent
      )
      self.assertEqual(
          str(hawkes_kernel_power_law), "0.1 * (0.01 + t)^(-1.2)"
      )
  
      multiplier = 0
      cutoff = 0.01
      exponent = 1.2
      hawkes_kernel_power_law = HawkesKernelPowerLaw(
          multiplier, cutoff, exponent
      )
      self.assertEqual(str(hawkes_kernel_power_law), "0")
  
      multiplier = 0.1
      cutoff = 0.01
      exponent = 0
      hawkes_kernel_power_law = HawkesKernelPowerLaw(
          multiplier, cutoff, exponent
      )
      self.assertEqual(str(hawkes_kernel_power_law), "0.1")
  
file_path: tick/tick/hawkes/simulation/tests/hawkes_kernel_power_law_test.py
imports: import unittest
  from tick.hawkes import HawkesKernelPowerLaw
label_desc: Use image node_id 5 for calling the Test obj's underlying member method code with example usage: obj.test_HawkesKernelPowerLaw_str() without return types