test/contrib/sdnv.uts

% SDNV library tests

############
############
+ Test SDNV encoding/decoding

= Load SDNVUtil

# Explicit to load SDNVUtil
load_contrib("sdnv")

= Define utils

def doTestVector(vec):
    # Test numbers individually
    for n in vec:
        ba = SDNVUtil.encode(n)
        (num, sdnvLen) = SDNVUtil.decode(ba, 0)
        if num != n:
            print("Error encoding/decoding", n)
            return False
    # Encode them all in a bunch
    ba = bytearray()
    for n in vec:
        temp = SDNVUtil.encode(n)
        ba = ba + temp
    offset = 0
    outNums = []
    for n in vec:
        (num, sdnvLen) = SDNVUtil.decode(ba, offset)
        outNums.append(num)
        offset += sdnvLen
    if outNums != vec:
        print("Failed on multi-number encode/decode")
        return False
    return True

= Vector tests: small ints

ba = bytearray()
theNums = [0, 1, 2, 5, 126, 127, 128, 129,
           130, 150, 190, 220, 254, 255, 256]
assert doTestVector(theNums)

= Vector tests: big ints

theNums = [0, 1, 0, 1, 0, 128, 32765,
           SDNVUtil.maxValue - 10, 4, 32766, 32767, 32768, 32769]
assert doTestVector(theNums)

= 100 random vector tests

import random

def doRandomTestVector(howMany):
    vec = []
    for i in range(0, howMany):
        vec.append(random.randint(0, SDNVUtil.maxValue))
    result = doTestVector(vec)
    return result

assert doRandomTestVector(100)

= SDVN tests

# Tests using the SDNV class
s = SDNV(30)
b = s.encode(17)
theNums = [0, 4, 20, 29, 30, 31, 33]
not_enc = []
for n in theNums:
    try:
        b = s.encode(n)
    except SDNVValueError as e:
        print("Could not encode", n, "-- maximum value is:", e.maxValue)
        not_enc.append(n)

not_enc.sort()
assert not_enc == [31, 33]