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test_mmh3.py
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test_mmh3.py
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# -*- coding: utf-8 -*-
import sys
import mmh3
import numpy as np
# see also https://stackoverflow.com/a/1375939
def u32_to_s32(v):
if v & 0x80000000:
return -0x100000000 + v
else:
return v
# Note that MurmurHash3 is endian-sensitive.
# In big-endian environments, these tests may fail.
def test_hash():
assert mmh3.hash("foo") == -156908512
# Several test vectors devised by Ian Boyd
# https://stackoverflow.com/a/31929528
assert mmh3.hash(b"", seed=0) == 0
assert mmh3.hash(b"", seed=1) == 0x514E28B7
assert mmh3.hash(b"", seed=u32_to_s32(0xFFFFFFFF)) == u32_to_s32(0x81F16F39)
assert mmh3.hash(b"\x21\x43\x65\x87", 0) == u32_to_s32(0xF55B516B)
assert mmh3.hash(b"\x21\x43\x65\x87", u32_to_s32(0x5082EDEE)) == u32_to_s32(
0x2362F9DE
)
assert mmh3.hash(b"\x21\x43\x65", 0) == u32_to_s32(0x7E4A8634)
assert mmh3.hash(b"\x21\x43", 0) == u32_to_s32(0xA0F7B07A)
assert mmh3.hash(b"\x21", 0) == u32_to_s32(0x72661CF4)
assert mmh3.hash(b"\xff\xff\xff\xff", 0) == u32_to_s32(0x76293B50)
assert mmh3.hash(b"\x00\x00\x00\x00", 0) == u32_to_s32(0x2362F9DE)
assert mmh3.hash(b"\x00\x00\x00", 0) == u32_to_s32(0x85F0B427)
assert mmh3.hash(b"\x00\x00", 0) == u32_to_s32(0x30F4C306)
assert mmh3.hash(b"\x00", 0) == u32_to_s32(0x514E28B7)
assert mmh3.hash("aaaa", u32_to_s32(0x9747B28C)) == u32_to_s32(0x5A97808A)
assert mmh3.hash("aaa", u32_to_s32(0x9747B28C)) == u32_to_s32(0x283E0130)
assert mmh3.hash("aa", u32_to_s32(0x9747B28C)) == u32_to_s32(0x5D211726)
assert mmh3.hash("a", u32_to_s32(0x9747B28C)) == u32_to_s32(0x7FA09EA6)
assert mmh3.hash("abcd", u32_to_s32(0x9747B28C)) == u32_to_s32(0xF0478627)
assert mmh3.hash("abc", u32_to_s32(0x9747B28C)) == u32_to_s32(0xC84A62DD)
assert mmh3.hash("ab", u32_to_s32(0x9747B28C)) == u32_to_s32(0x74875592)
assert mmh3.hash("a", u32_to_s32(0x9747B28C)) == u32_to_s32(0x7FA09EA6)
assert mmh3.hash("Hello, world!", u32_to_s32(0x9747B28C)) == u32_to_s32(0x24884CBA)
assert mmh3.hash(u"ππππππππ".encode("utf-8"), u32_to_s32(0x9747B28C)) == u32_to_s32(
0xD58063C1
)
assert mmh3.hash("a" * 256, u32_to_s32(0x9747B28C)) == u32_to_s32(0x37405BDC)
assert mmh3.hash("abc", 0) == u32_to_s32(0xB3DD93FA)
assert mmh3.hash(
"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 0
) == u32_to_s32(0xEE925B90)
assert mmh3.hash(
"The quick brown fox jumps over the lazy dog", u32_to_s32(0x9747B28C)
) == u32_to_s32(0x2FA826CD)
assert mmh3.hash(
"The quick brown fox jumps over the lazy dog", u32_to_s32(0x9747B28C)
) == u32_to_s32(0x2FA826CD)
def test_hash_unsigned():
assert mmh3.hash("foo", signed=False) == 4138058784
# Several test vectors devised by Ian Boyd
# https://stackoverflow.com/a/31929528
assert mmh3.hash(b"", seed=0, signed=False) == 0
assert mmh3.hash(b"", seed=1, signed=False) == 0x514E28B7
assert mmh3.hash(b"", seed=0xFFFFFFFF, signed=False) == 0x81F16F39
assert mmh3.hash(b"\x21\x43\x65\x87", 0, signed=False) == 0xF55B516B
assert mmh3.hash(b"\x21\x43\x65\x87", 0x5082EDEE, signed=False) == 0x2362F9DE
assert mmh3.hash(b"\x21\x43\x65", 0, signed=False) == 0x7E4A8634
assert mmh3.hash(b"\x21\x43", 0, signed=False) == 0xA0F7B07A
assert mmh3.hash(b"\x21", 0, signed=False) == 0x72661CF4
assert mmh3.hash(b"\xff\xff\xff\xff", 0, signed=False) == 0x76293B50
assert mmh3.hash(b"\x00\x00\x00\x00", 0, signed=False) == 0x2362F9DE
assert mmh3.hash(b"\x00\x00\x00", 0, signed=False) == 0x85F0B427
assert mmh3.hash(b"\x00\x00", 0, signed=False) == 0x30F4C306
assert mmh3.hash(b"\x00", 0, signed=False) == 0x514E28B7
assert mmh3.hash("aaaa", 0x9747B28C, signed=False) == 0x5A97808A
assert mmh3.hash("aaa", 0x9747B28C, signed=False) == 0x283E0130
assert mmh3.hash("aa", 0x9747B28C, signed=False) == 0x5D211726
assert mmh3.hash("a", 0x9747B28C, signed=False) == 0x7FA09EA6
assert mmh3.hash("abcd", 0x9747B28C, signed=False) == 0xF0478627
assert mmh3.hash("abc", 0x9747B28C, signed=False) == 0xC84A62DD
assert mmh3.hash("ab", 0x9747B28C, signed=False) == 0x74875592
assert mmh3.hash("a", 0x9747B28C, signed=False) == 0x7FA09EA6
assert mmh3.hash("Hello, world!", 0x9747B28C, signed=False) == 0x24884CBA
assert (
mmh3.hash(u"ππππππππ".encode("utf-8"), 0x9747B28C, signed=False) == 0xD58063C1
)
assert mmh3.hash("a" * 256, 0x9747B28C, signed=False) == 0x37405BDC
assert mmh3.hash("abc", 0, signed=False) == 0xB3DD93FA
assert (
mmh3.hash(
"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 0, signed=False
)
== 0xEE925B90
)
assert (
mmh3.hash(
"The quick brown fox jumps over the lazy dog", 0x9747B28C, signed=False
)
== 0x2FA826CD
)
assert (
mmh3.hash(
"The quick brown fox jumps over the lazy dog", 0x9747B28C, signed=False
)
== 0x2FA826CD
)
def test_hash2():
assert mmh3.hash("foo") == -156908512
# Several test vectors devised by Ian Boyd
# https://stackoverflow.com/a/31929528
assert mmh3.hash(b"", seed=0) == 0
assert mmh3.hash(b"", seed=1) == 0x514E28B7
assert mmh3.hash(b"", seed=0xFFFFFFFF) == u32_to_s32(0x81F16F39)
assert mmh3.hash(b"\x21\x43\x65\x87", 0) == u32_to_s32(0xF55B516B)
assert mmh3.hash(b"\x21\x43\x65\x87", 0x5082EDEE) == u32_to_s32(0x2362F9DE)
assert mmh3.hash(b"\x21\x43\x65", 0) == u32_to_s32(0x7E4A8634)
assert mmh3.hash(b"\x21\x43", 0) == u32_to_s32(0xA0F7B07A)
assert mmh3.hash(b"\x21", 0) == u32_to_s32(0x72661CF4)
assert mmh3.hash(b"\xff\xff\xff\xff", 0) == u32_to_s32(0x76293B50)
assert mmh3.hash(b"\x00\x00\x00\x00", 0) == u32_to_s32(0x2362F9DE)
assert mmh3.hash(b"\x00\x00\x00", 0) == u32_to_s32(0x85F0B427)
assert mmh3.hash(b"\x00\x00", 0) == u32_to_s32(0x30F4C306)
assert mmh3.hash(b"\x00", 0) == u32_to_s32(0x514E28B7)
assert mmh3.hash("aaaa", 0x9747B28C) == u32_to_s32(0x5A97808A)
assert mmh3.hash("aaa", 0x9747B28C) == u32_to_s32(0x283E0130)
assert mmh3.hash("aa", 0x9747B28C) == u32_to_s32(0x5D211726)
assert mmh3.hash("a", 0x9747B28C) == u32_to_s32(0x7FA09EA6)
assert mmh3.hash("abcd", 0x9747B28C) == u32_to_s32(0xF0478627)
assert mmh3.hash("abc", 0x9747B28C) == u32_to_s32(0xC84A62DD)
assert mmh3.hash("ab", 0x9747B28C) == u32_to_s32(0x74875592)
assert mmh3.hash("a", 0x9747B28C) == u32_to_s32(0x7FA09EA6)
assert mmh3.hash("Hello, world!", 0x9747B28C) == u32_to_s32(0x24884CBA)
assert mmh3.hash(u"ππππππππ".encode("utf-8"), 0x9747B28C) == u32_to_s32(0xD58063C1)
assert mmh3.hash("a" * 256, 0x9747B28C) == u32_to_s32(0x37405BDC)
assert mmh3.hash("abc", 0) == u32_to_s32(0xB3DD93FA)
assert mmh3.hash(
"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 0
) == u32_to_s32(0xEE925B90)
assert mmh3.hash(
"The quick brown fox jumps over the lazy dog", 0x9747B28C
) == u32_to_s32(0x2FA826CD)
def test_hash_from_buffer():
mview = memoryview("foo".encode("utf8"))
assert mmh3.hash_from_buffer(mview) == -156908512
assert mmh3.hash_from_buffer(mview, signed=False) == 4138058784
def test_hash_bytes():
assert mmh3.hash_bytes("foo") == b"aE\xf5\x01W\x86q\xe2\x87}\xba+\xe4\x87\xaf~"
# TODO
def test_hash64():
assert mmh3.hash64("foo") == (-2129773440516405919, 9128664383759220103)
assert mmh3.hash64("foo", signed=False) == (
16316970633193145697,
9128664383759220103,
)
# TODO
def test_hash128():
assert mmh3.hash128("foo") == 168394135621993849475852668931176482145
assert mmh3.hash128("foo", 42) == 215966891540331383248189432718888555506
assert (
mmh3.hash128("foo", 42, signed=False) == 215966891540331383248189432718888555506
)
assert (
mmh3.hash128("foo", 42, signed=True) == -124315475380607080215185174712879655950
)
# TODO
def test_64bit():
if sys.maxsize < (1 << 32): # Skip this test under 32-bit environments
return
a = np.zeros(2 ** 32, dtype=np.int8)
assert mmh3.hash(a) == -1988950868
assert mmh3.hash64(a) == (-6319308327427928234, -8156928649350215884)
assert mmh3.hash128(a) == 189813591698865711411311444615608766294
assert mmh3.hash_bytes(a) == b"V\x8f}\xad\x8eNM\xa84\x07FU\x9c\xc4\xcc\x8e"