def test_random_non_alter():
val = 10.
neq = 0
for i in xrange(10000):
newval = alter(val, 1000., alter=False)
if newval != val:
neq += 1
assert neq == 0
def test_random_number_gen_nonnegative():
orig = 1.
nez = 0
for i in xrange(10000):
newval = alter(orig, 1000., alter=True)
assert newval > 0
if newval != 1.:
nez += 1
assert nez > 0
def test_random_number_gen_negative():
orig = 1.
lz = 0
nez = 0
for i in xrange(10000):
newval = alter(orig, 1000., alter=True, negative=True)
if newval <= 0:
lz += 1
if newval != 1.:
nez += 1
assert lz > 0
assert nez > 0
