def test__argmin_10():
epsilon = 1e-6
lo = 0
hi = 1e20
x_min = -5000
f = lambda x: x
assert abs(argmin(f,lo,hi,epsilon)-0) <= epsilon
def test__argmin_4():
epsilon = 1e-9
lo = -20
hi = 20
x_min = 5
f = lambda x: (x-x_min)**2
assert abs(argmin(f,lo,hi,epsilon)-x_min) <= epsilon
def test__argmin_8():
epsilon = 1e-6
lo = 0
hi = 1e20
x_min = 5000
f = lambda x: (x-x_min)**2
assert abs(argmin(f,lo,hi,epsilon)-x_min) <= epsilon
