Comment #4 on issue 1493 by ryanlists: factor a minus 1 out of fractions in  
simplify
http://code.google.com/p/sympy/issues/detail?id=1493

and here is my full test result:

ryan|03:27 PM|~/git/sympy (simplify_minus_sign)$ bin/test
============================= test process starts  
==============================
executable:   /usr/bin/python  (2.6.2-final-0)

sympy/concrete/tests/test_gosper.py[2] ..                                    
[OK]
sympy/concrete/tests/test_products.py[3] ...                                 
[OK]
sympy/concrete/tests/test_sums_products.py[13] ...fff.......                 
[OK]
sympy/core/tests/test_arit.py[42] ...ff.....................................
                                                                              
[OK]
sympy/core/tests/test_assumptions.py[27] ...f.......................         
[OK]
sympy/core/tests/test_basic.py[39] .......................................   
[OK]
sympy/core/tests/test_cache.py[1] .                                          
[OK]
sympy/core/tests/test_complex.py[10] ..........                              
[OK]
sympy/core/tests/test_count_ops.py[1] .                                      
[OK]
sympy/core/tests/test_diff.py[5] .....                                       
[OK]
sympy/core/tests/test_equal.py[5] .....                                      
[OK]
sympy/core/tests/test_eval.py[8] ...f....                                    
[OK]
sympy/core/tests/test_eval_power.py[9] .........                             
[OK]
sympy/core/tests/test_evalf.py[19] ...................                       
[OK]
sympy/core/tests/test_facts.py[11] ...........                               
[OK]
sympy/core/tests/test_functions.py[26] ....ff....................            
[OK]
sympy/core/tests/test_logic.py[10] ..........                                
[OK]
sympy/core/tests/test_match.py[26] ..f.......................                
[OK]
sympy/core/tests/test_multidimensional.py[4] ....                            
[OK]
sympy/core/tests/test_numbers.py[29] .............................           
[OK]
sympy/core/tests/test_relational.py[5] .....                                 
[OK]
sympy/core/tests/test_subs.py[20] ....................                       
[OK]
sympy/core/tests/test_symbol.py[5] .....                                     
[OK]
sympy/core/tests/test_sympify.py[19] ...................                     
[OK]
sympy/core/tests/test_truediv.py[3] ...                                      
[OK]
sympy/core/tests/test_var.py[4] ....                                         
[OK]
sympy/functions/combinatorial/tests/test_comb_factorials.py[3] ...           
[OK]
sympy/functions/combinatorial/tests/test_comb_numbers.py[4] ....             
[OK]
sympy/functions/elementary/tests/test_complexes.py[9] .........              
[OK]
sympy/functions/elementary/tests/test_exponential.py[9] .........            
[OK]
sympy/functions/elementary/tests/test_hyperbolic.py[11] .f.........          
[OK]
sympy/functions/elementary/tests/test_integers.py[3] .f.                     
[OK]
sympy/functions/elementary/tests/test_interface.py[3] ...                    
[OK]
sympy/functions/elementary/tests/test_miscellaneous.py[2] ..                 
[OK]
sympy/functions/elementary/tests/test_piecewise.py[1] .                      
[OK]
sympy/functions/elementary/tests/test_trigonometric.py[11] ...........       
[OK]
sympy/functions/special/tests/test_delta_functions.py[2] ..                  
[OK]
sympy/functions/special/tests/test_error_functions.py[3] ...                 
[OK]
sympy/functions/special/tests/test_gamma_functions.py[6] ......              
[OK]
sympy/functions/special/tests/test_spec_polynomials.py[4] ....               
[OK]
sympy/functions/special/tests/test_spherical_harmonics.py[5] .....           
[OK]
sympy/functions/special/tests/test_tensor_functions.py[2] ..                 
[OK]
sympy/functions/special/tests/test_zeta_functions.py[2] ..                   
[OK]
sympy/galgebra/tests/test_GA.py[9] .........                                 
[OK]
sympy/geometry/tests/test_geometry.py[7] .......                             
[OK]
sympy/integrals/tests/test_integrals.py[39] ....................................
...                                                                          
[OK]
sympy/integrals/tests/test_lineintegrals.py[1] .                             
[OK]
sympy/integrals/tests/test_rationaltools.py[2] ..                            
[OK]
sympy/integrals/tests/test_risch.py[19] ...ffff............                  
[OK]
sympy/integrals/tests/test_trigonometry.py[2] ..                             
[OK]
sympy/logic/tests/test_boolalg.py[22] ......................                 
[OK]
sympy/logic/tests/test_dimacs.py[4] ...s                                     
[OK]
sympy/logic/tests/test_inference.py[9] .........                             
[OK]
sympy/matrices/tests/test_matrices.py[45] ......................................
.......                                                                      
[OK]
sympy/mpmath/tests/test_basic_ops.py[11] ...........                         
[OK]
sympy/mpmath/tests/test_bitwise.py[10] ..........                            
[OK]
sympy/mpmath/tests/test_calculus.py[6] ......                                
[OK]
sympy/mpmath/tests/test_compatibility.py[3] ...                              
[OK]
sympy/mpmath/tests/test_convert.py[12] ............                          
[OK]
sympy/mpmath/tests/test_diff_mpmath.py[2] ..                                 
[OK]
sympy/mpmath/tests/test_division.py[7] .......                               
[OK]
sympy/mpmath/tests/test_elliptic.py[11] ...........                          
[OK]
sympy/mpmath/tests/test_functions2.py[16] ................                   
[OK]
sympy/mpmath/tests/test_functions_mpmath.py[39] ................................
.......                                                                      
[OK]
sympy/mpmath/tests/test_gammazeta.py[26] ..........................          
[OK]
sympy/mpmath/tests/test_hp.py[3] ...                                         
[OK]
sympy/mpmath/tests/test_identify.py[2] ..                                    
[OK]
sympy/mpmath/tests/test_interval.py[9] .........                             
[OK]
sympy/mpmath/tests/test_linalg.py[13] .............                          
[OK]
sympy/mpmath/tests/test_matrices_mpmath.py[8] ........                       
[OK]
sympy/mpmath/tests/test_mpmath.py[7] .......                                 
[OK]
sympy/mpmath/tests/test_ode_mpmath.py[5] .....                               
[OK]
sympy/mpmath/tests/test_pickle.py[1] .                                       
[OK]
sympy/mpmath/tests/test_power.py[3] ...                                      
[OK]
sympy/mpmath/tests/test_quad.py[13] .............                            
[OK]
sympy/mpmath/tests/test_rootfinding.py[7] .......                            
[OK]
sympy/mpmath/tests/test_special.py[5] .....                                  
[OK]
sympy/mpmath/tests/test_summation.py[5] .....                                
[OK]
sympy/mpmath/tests/test_trig.py[3] ...                                       
[OK]
sympy/ntheory/tests/test_ntheory.py[18] ..................                   
[OK]
sympy/parsing/tests/test_mathematica.py[1] .                                 
[OK]
sympy/parsing/tests/test_maxima.py[3] ...                                    
[OK]
sympy/physics/tests/test_paulialgebra.py[1] .                                
[OK]
sympy/physics/tests/test_physics_matrices.py[2] ..                           
[OK]
sympy/physics/tests/test_secondquant.py[14] ..............                   
[OK]
sympy/physics/tests/test_units.py[1] .                                       
[OK]
sympy/plotting/tests/test_plotting.py[10] ..........                         
[OK]
sympy/polys/tests/test_galoispolys.py[19] ...................                
[OK]
sympy/polys/tests/test_integerpolys.py[80] .....................................
...........................................                                  
[OK]
sympy/polys/tests/test_polynomial.py[52] .......................................
.............                                                                
[OK]
sympy/polys/tests/test_specialpolys.py[3] ...                                
[OK]
sympy/printing/pretty/tests/test_pretty.py[18] ..................            
[OK]
sympy/printing/pretty/tests/test_pretty_unicode.py[18] ..................    
[OK]
sympy/printing/tests/test_ccode.py[8] ........                               
[OK]
sympy/printing/tests/test_gtk.py[1] f                                        
[OK]
sympy/printing/tests/test_lambdarepr.py[2] ..                                
[OK]
sympy/printing/tests/test_latex.py[17] ...f.............                     
[OK]
sympy/printing/tests/test_mathml.py[12] ............                         
[OK]
sympy/printing/tests/test_precedence.py[11] ...........                      
[OK]
sympy/printing/tests/test_python.py[6] ......                                
[OK]
sympy/printing/tests/test_repr.py[19] ...................                    
[OK]
sympy/printing/tests/test_str.py[55] ...........................................
............                                                                 
[OK]
sympy/series/tests/test_demidovich.py[17] .................                  
[OK]
sympy/series/tests/test_gruntz.py[22] .f....................                 
[OK]
sympy/series/tests/test_limits.py[17] ....f............                      
[OK]
sympy/series/tests/test_lseries.py[4] ....                                   
[OK]
sympy/series/tests/test_nseries.py[62] .........................................
.....................                                                        
[OK]
sympy/series/tests/test_order.py[26] ..........................              
[OK]
sympy/series/tests/test_series.py[4] ....                                    
[OK]
sympy/simplify/tests/test_cse.py[9] .........                                
[OK]
sympy/simplify/tests/test_rewrite.py[6] ...f..                               
[OK]
sympy/simplify/tests/test_simplify.py[29] ...Xfff......................      
[OK]
sympy/simplify/tests/test_sqrtdenest.py[2] .X                                
[OK]
sympy/slow_tests/test_core.py[1] .                                           
[OK]
sympy/solvers/tests/test_numeric.py[1] .                                     
[OK]
sympy/solvers/tests/test_ode.py[12] ............                             
[OK]
sympy/solvers/tests/test_polysys.py[1] .                                     
[OK]
sympy/solvers/tests/test_recurr.py[39] .......................................
                                                                              
[OK]
sympy/solvers/tests/test_solvers.py[20] ....................                 
[OK]
sympy/statistics/tests/test_statistics.py[5] .....                           
[OK]
sympy/test_external/test_codegen_c_cc.py[5] .....                            
[OK]
sympy/test_external/test_numpy.py[19] ...................                    
[OK]
sympy/test_external/test_sage.py[0]                                          
[OK]
sympy/utilities/tests/test_code_quality.py[2] ..                             
[OK]
sympy/utilities/tests/test_codegen.py[10] ..........                         
[OK]
sympy/utilities/tests/test_decorator.py[1] .                                 
[OK]
sympy/utilities/tests/test_iterables.py[5] .....                             
[OK]
sympy/utilities/tests/test_lambdify.py[25] ....f....................         
[OK]
sympy/utilities/tests/test_pickling.py[28]  
ffffff...........^X^F...........     [OK]
sympy/utilities/tests/test_pytest.py[1] .                                    
[OK]
sympy/utilities/tests/test_source.py[2] ..                                   
[OK]
sympy/utilities/tests/test_tests_names.py[1] .                               
[OK]

________________________________ xpassed tests  
_________________________________
sympy/simplify/tests/test_simplify.py:
sympy/simplify/tests/test_sqrtdenest.py:

  tests finished: 1525 passed, 1 skipped, 31 xfailed, 2 xpassed in 268.47  
seconds

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