docstr: ...Test HawkesKernel0 string representation
          
docstr_tok: ["...","Test","HawkesKernel0","string","representation"]
code: def test_HawkesKernel0_str(self):
      """...Test HawkesKernel0 string representation"""
      self.assertEqual(str(self.hawkes_kernel_0), "0")
  
imports: import unittest
  from tick.hawkes import HawkesKernel0
label_desc: Use image node_id 2 for calling the Test obj's underlying member method code with example usage: obj.test_HawkesKernel0_str() without return types