text: import logging
  
  
  def test_which(caplog):
      caplog.set_level(logging.INFO)
      caplog.set_level(logging.DEBUG, logger="cryptoadvance.specter")
      import cryptoadvance.specter.util.shell as helpers
  
      try:
          helpers.which("some_non_existing_binary")
          assert False, "Should raise an Exception"
      except:
          pass
      assert (
          helpers.which("date") == "/bin/date" or helpers.which("date") == "/usr/bin/date"
      )  # travis-CI has it on /bin/date
  
  
  def test_last_lines(caplog):
      from cryptoadvance.specter.util.shell import get_last_lines_from_file
  
      lines = get_last_lines_from_file("LICENSE", 30)
      assert lines[-2].startswith("OUT OF OR IN CONNECTION WITH THE SOFTWARE ")
  
  
  def test_grep():
      from cryptoadvance.specter.util.shell import grep
  
      assert grep("./setup.py", 'name="cryptoadvance.specter",')
  