code: def test_Find_the_biggest():
      fbg = fsl.FindTheBiggest()
  
      # make sure command gets called
      assert fbg.cmd == "find_the_biggest"
  
      # test raising error with mandatory args absent
      with pytest.raises(ValueError):
          fbg.run()
  
      # .inputs based parameters setting
      fbg.inputs.infiles = "seed*"
      fbg.inputs.outfile = "fbgfile"
      assert fbg.cmdline == "find_the_biggest seed* fbgfile"
  
      fbg2 = fsl.FindTheBiggest(infiles="seed2*", outfile="fbgfile2")
      assert fbg2.cmdline == "find_the_biggest seed2* fbgfile2"
  
      # .run based parameters setting
      fbg3 = fsl.FindTheBiggest()
      results = fbg3.run(infiles="seed3", outfile="out3")
      assert results.runtime.cmdline == "find_the_biggest seed3 out3"
  
file_path: nipype/nipype/interfaces/fsl/tests/test_dti.py
imports: import os
  import nipype.interfaces.fsl.dti
  from nipype.interfaces.fsl import Info, no_fsl
  from nipype.interfaces.base import Undefined
  import pytest
  from nipype.testing.fixtures import create_files_in_directory
label_desc: Use image node_id 6 for calling a global function with example usage: test_Find_the_biggest() without return types