text: #coding:utf-8
  #
  # id:           functional.intfunc.math.acos_01
  # title:        New Built-in Functions, Firebird 2.1 : ACOS( <number> )
  # decription:   test of ACOS
  #               
  #               Returns the arc cosine of a number. Argument to ACOS must be in the range -1 to 1. Returns a value in the range 0 to PI. er.
  # tracker_id:   
  # min_versions: []
  # versions:     2.1
  # qmid:         functional.intfunc.math.acos_01
  
  import pytest
  from firebird.qa import db_factory, isql_act, Action
  
  # version: 2.1
  # resources: None
  
  substitutions_1 = []
  
  init_script_1 = """"""
  
  db_1 = db_factory(sql_dialect=3, init=init_script_1)
  
  test_script_1 = """select cast( ACOS( 1 ) AS DECIMAL(18,15)) from rdb$database;"""
  
  act_1 = isql_act('db_1', test_script_1, substitutions=substitutions_1)
  
  expected_stdout_1 = """
                   CAST
  =====================
      0.000000000000000
  
  """
  
  @pytest.mark.version('>=2.1')
  def test_1(act_1: Action):
      act_1.expected_stdout = expected_stdout_1
      act_1.execute()
      assert act_1.clean_expected_stdout == act_1.clean_stdout
  
  