desc: Tests for basic usage of the subtraction operation
tests:
    
    - cd: r.expr(1).sub(1)
      py: 
        - r.expr(1) - 1
        - 1 - r.expr(1)
        - r.expr(1).sub(1)
      rb:
        - (r 1) - 1
        - 1 - (r 1)
        - r(1).sub(1)
        - r.expr(1).sub(1)
      ot: 0

    - cd: r.expr(-1).sub(1)
      py: r.expr(-1) - 1
      rb: (r -1) - 1
      ot: -2

    - cd: r.expr(1.75).sub(8.5)
      py: r.expr(1.75) - 8.5
      rb: (r 1.75) - 8.5
      ot: -6.75

    - cd: r.expr(1).sub(2,3,4,5)
      ot: -13 

    # Type errors
    - cd: r.expr('a').sub(0.8)
      ot: err('ReqlQueryLogicError', 'Expected type NUMBER but found STRING.', [0])

    - cd: r.expr(1).sub('a')
      ot: err('ReqlQueryLogicError', 'Expected type NUMBER but found STRING.', [1])

    - cd: r.expr('b').sub('a')
      ot: err('ReqlQueryLogicError', 'Expected type NUMBER but found STRING.', [0])