python 3.x - Python3 How do I get assertEqual to print all the contextual info? -

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i'm using unittest.testcase in python 3 , needing more info printed when assertequal finds problem.

my test function includes statement:

self.assertequal(result, exp_result, "test_svg_glyph_scale test #" + str(test_num))

upon finding error, it's supposed print result , exp_result , string that's in call assertequal. however, it's truncating __repr__ outputs result , exp_result:

fail: test_scale (__main__.test_svg_glyph) ---------------------------------------------------------------------- traceback (most recent call last):   file "svg_glyph_test.py", line 322, in test_scale     self.assertequal(result, exp_result, "test_svg_glyph_scale test #" + str(test_num)) assertionerror: glyph[15 chars]5000,-0.5000)         l(0.0000,1.0000)        [75 chars]   ]) != glyph[15 chars]5000,0.5000)         l(0.0000,1.0000)         [74 chars]   ]) : test_svg_glyph_scale test #1

it's [15 chars] , [75 chars] see know what's being returned , expected (okay, know one) , able compare them easily.

maxdiff seems apply string comparisons. trying compare 2 structures.

is there setting can change characters printed?

i wanted disable strange python 3-behaviour. seems way fix monkey-patch unittest.util module directly:

unittest.util._max_length = 160  # default 80, doubles

after "[25 chars]" strings gone, , read output of test failures again.

(for reference, affected code util.py on github)


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