test_roots: robustify tests for roots(x**3 + x**2 - x + 1)
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treea8ee0a8ff1fc4c26e6d7ffe0b6797f4ddeb818cc
drwxr-xr-x   ..
-rw-r--r-- 1170 __init__.py
-rw-r--r-- 305 abc.py
drwxr-xr-x - concrete
-rw-r--r-- 281 conftest.py
drwxr-xr-x - core
drwxr-xr-x - functions
drwxr-xr-x - geometry
drwxr-xr-x - integrals
drwxr-xr-x - interactive
drwxr-xr-x - matrices
drwxr-xr-x - mpmath
drwxr-xr-x - ntheory
drwxr-xr-x - parsing
drwxr-xr-x - physics
drwxr-xr-x - plotting
drwxr-xr-x - polynomials
drwxr-xr-x - polys
drwxr-xr-x - printing
drwxr-xr-x - series
drwxr-xr-x - simplify
drwxr-xr-x - solvers
drwxr-xr-x - statistics
drwxr-xr-x - test_external
drwxr-xr-x - thirdparty
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