old_contents: from __future__ import absolute_import, division, print_function
  
  from blaze.expr.functions import *
  from blaze.expr import TableSymbol, Expr, Symbol
  import numpy as np
  
  
  def test_reductions():
      assert max([1, 2, 3]) == 3
      assert max(np.array([1, 2, 3])) == 3
      assert isinstance(max(TableSymbol('t', '{x: int, y: int}').x), Expr)
      assert all([True, True, True]) is True
      assert all([True, True, False]) is False
  
  
  def test_math():
      assert sin(0) == 0
      assert isinstance(sin(0), float)
      assert isinstance(sin(np.int32(0)), np.float)
      assert isinstance(sin(Symbol('x', 'real')), Expr)
  
new_contents: from __future__ import absolute_import, division, print_function
  
  from blaze.expr.functions import *
  from blaze.expr import Expr, symbol
  from blaze.expr import math
  import numpy as np
  
  
  def test_reductions():
      assert max([1, 2, 3]) == 3
      assert max(np.array([1, 2, 3])) == 3
      assert isinstance(max(symbol('t', 'var * {x: int, y: int}').x), Expr)
      assert all([True, True, True]) is True
      assert all([True, True, False]) is False
  
  
  def test_math():
      assert sin(0) == 0
      assert isinstance(sin(0), float)
      assert isinstance(sin(np.int32(0)), np.float)
      assert isinstance(sin(symbol('x', 'real')), Expr)
  
  
  def test_abs():
      assert abs(-1) == 1
      assert (abs(np.array([-1, 2, 3])) == np.array([1, 2, 3])).all()
      x = symbol('x', 'int')
      assert isinstance(abs(x), math.abs)
  
subject: test that blaze.abs behaves well