class_docstr: An implementation of BaseGUITestRunner using Tkinter.
      
class_docstr_tok: ["An","implementation","of","BaseGUITestRunner","using","Tkinter","."]
code: def notifyTestsDiscovered(self, test_suite):
      discovered = test_suite.countTestCases()
      self.runCountVar.set(0)
      self.failCountVar.set(0)
      self.errorCountVar.set(0)
      self.remainingCountVar.set(discovered)
      self.progressBar.setProgressFraction(0.0)
      self.errorListbox.delete(0, tk.END)
      self.statusVar.set(
          "Discovering tests from %s. Found: %s"
          % (self.directory_to_read, discovered)
      )
      self.stopGoButton["state"] = tk.NORMAL
  
imports: import sys
  import traceback
  import unittest
  import tkinter
  from tkinter import messagebox
  from tkinter import filedialog
  from tkinter import simpledialog
label_desc: Use image node_id 4 for calling the TkTestRunner obj's underlying member method code with example usage: obj.notifyTestsDiscovered(test_suite) without return types