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diff --git a/tests/bytecode/pylib-tests/base64.py b/tests/bytecode/pylib-tests/base64.py
new file mode 100644
index 0000000000..17c6d1f3ee
--- /dev/null
+++ b/tests/bytecode/pylib-tests/base64.py
@@ -0,0 +1,410 @@
+#! /usr/bin/env python3
+
+"""RFC 3548: Base16, Base32, Base64 Data Encodings"""
+
+# Modified 04-Oct-1995 by Jack Jansen to use binascii module
+# Modified 30-Dec-2003 by Barry Warsaw to add full RFC 3548 support
+# Modified 22-May-2007 by Guido van Rossum to use bytes everywhere
+
+import re
+import struct
+import binascii
+
+
+__all__ = [
+    # Legacy interface exports traditional RFC 1521 Base64 encodings
+    'encode', 'decode', 'encodebytes', 'decodebytes',
+    # Generalized interface for other encodings
+    'b64encode', 'b64decode', 'b32encode', 'b32decode',
+    'b16encode', 'b16decode',
+    # Standard Base64 encoding
+    'standard_b64encode', 'standard_b64decode',
+    # Some common Base64 alternatives.  As referenced by RFC 3458, see thread
+    # starting at:
+    #
+    # http://zgp.org/pipermail/p2p-hackers/2001-September/000316.html
+    'urlsafe_b64encode', 'urlsafe_b64decode',
+    ]
+
+
+bytes_types = (bytes, bytearray)  # Types acceptable as binary data
+
+def _bytes_from_decode_data(s):
+    if isinstance(s, str):
+        try:
+            return s.encode('ascii')
+        except UnicodeEncodeError:
+            raise ValueError('string argument should contain only ASCII characters')
+    elif isinstance(s, bytes_types):
+        return s
+    else:
+        raise TypeError("argument should be bytes or ASCII string, not %s" % s.__class__.__name__)
+
+
+
+# Base64 encoding/decoding uses binascii
+
+def b64encode(s, altchars=None):
+    """Encode a byte string using Base64.
+
+    s is the byte string to encode.  Optional altchars must be a byte
+    string of length 2 which specifies an alternative alphabet for the
+    '+' and '/' characters.  This allows an application to
+    e.g. generate url or filesystem safe Base64 strings.
+
+    The encoded byte string is returned.
+    """
+    if not isinstance(s, bytes_types):
+        raise TypeError("expected bytes, not %s" % s.__class__.__name__)
+    # Strip off the trailing newline
+    encoded = binascii.b2a_base64(s)[:-1]
+    if altchars is not None:
+        if not isinstance(altchars, bytes_types):
+            raise TypeError("expected bytes, not %s"
+                            % altchars.__class__.__name__)
+        assert len(altchars) == 2, repr(altchars)
+        return encoded.translate(bytes.maketrans(b'+/', altchars))
+    return encoded
+
+
+def b64decode(s, altchars=None, validate=False):
+    """Decode a Base64 encoded byte string.
+
+    s is the byte string to decode.  Optional altchars must be a
+    string of length 2 which specifies the alternative alphabet used
+    instead of the '+' and '/' characters.
+
+    The decoded string is returned.  A binascii.Error is raised if s is
+    incorrectly padded.
+
+    If validate is False (the default), non-base64-alphabet characters are
+    discarded prior to the padding check.  If validate is True,
+    non-base64-alphabet characters in the input result in a binascii.Error.
+    """
+    s = _bytes_from_decode_data(s)
+    if altchars is not None:
+        altchars = _bytes_from_decode_data(altchars)
+        assert len(altchars) == 2, repr(altchars)
+        s = s.translate(bytes.maketrans(altchars, b'+/'))
+    if validate and re.match(b'^[A-Za-z0-9+/]*={0,2}$', s):
+        raise binascii.Error('Non-base64 digit found')
+    return binascii.a2b_base64(s)
+
+
+def standard_b64encode(s):
+    """Encode a byte string using the standard Base64 alphabet.
+
+    s is the byte string to encode.  The encoded byte string is returned.
+    """
+    return b64encode(s)
+
+def standard_b64decode(s):
+    """Decode a byte string encoded with the standard Base64 alphabet.
+
+    s is the byte string to decode.  The decoded byte string is
+    returned.  binascii.Error is raised if the input is incorrectly
+    padded or if there are non-alphabet characters present in the
+    input.
+    """
+    return b64decode(s)
+
+
+_urlsafe_encode_translation = bytes.maketrans(b'+/', b'-_')
+_urlsafe_decode_translation = bytes.maketrans(b'-_', b'+/')
+
+def urlsafe_b64encode(s):
+    """Encode a byte string using a url-safe Base64 alphabet.
+
+    s is the byte string to encode.  The encoded byte string is
+    returned.  The alphabet uses '-' instead of '+' and '_' instead of
+    '/'.
+    """
+    return b64encode(s).translate(_urlsafe_encode_translation)
+
+def urlsafe_b64decode(s):
+    """Decode a byte string encoded with the standard Base64 alphabet.
+
+    s is the byte string to decode.  The decoded byte string is
+    returned.  binascii.Error is raised if the input is incorrectly
+    padded or if there are non-alphabet characters present in the
+    input.
+
+    The alphabet uses '-' instead of '+' and '_' instead of '/'.
+    """
+    s = _bytes_from_decode_data(s)
+    s = s.translate(_urlsafe_decode_translation)
+    return b64decode(s)
+
+
+
+# Base32 encoding/decoding must be done in Python
+_b32alphabet = {
+    0: b'A',  9: b'J', 18: b'S', 27: b'3',
+    1: b'B', 10: b'K', 19: b'T', 28: b'4',
+    2: b'C', 11: b'L', 20: b'U', 29: b'5',
+    3: b'D', 12: b'M', 21: b'V', 30: b'6',
+    4: b'E', 13: b'N', 22: b'W', 31: b'7',
+    5: b'F', 14: b'O', 23: b'X',
+    6: b'G', 15: b'P', 24: b'Y',
+    7: b'H', 16: b'Q', 25: b'Z',
+    8: b'I', 17: b'R', 26: b'2',
+    }
+
+_b32tab = [v[0] for k, v in sorted(_b32alphabet.items())]
+_b32rev = dict([(v[0], k) for k, v in _b32alphabet.items()])
+
+
+def b32encode(s):
+    """Encode a byte string using Base32.
+
+    s is the byte string to encode.  The encoded byte string is returned.
+    """
+    if not isinstance(s, bytes_types):
+        raise TypeError("expected bytes, not %s" % s.__class__.__name__)
+    quanta, leftover = divmod(len(s), 5)
+    # Pad the last quantum with zero bits if necessary
+    if leftover:
+        s = s + bytes(5 - leftover)  # Don't use += !
+        quanta += 1
+    encoded = bytes()
+    for i in range(quanta):
+        # c1 and c2 are 16 bits wide, c3 is 8 bits wide.  The intent of this
+        # code is to process the 40 bits in units of 5 bits.  So we take the 1
+        # leftover bit of c1 and tack it onto c2.  Then we take the 2 leftover
+        # bits of c2 and tack them onto c3.  The shifts and masks are intended
+        # to give us values of exactly 5 bits in width.
+        c1, c2, c3 = struct.unpack('!HHB', s[i*5:(i+1)*5])
+        c2 += (c1 & 1) << 16 # 17 bits wide
+        c3 += (c2 & 3) << 8  # 10 bits wide
+        encoded += bytes([_b32tab[c1 >> 11],         # bits 1 - 5
+                          _b32tab[(c1 >> 6) & 0x1f], # bits 6 - 10
+                          _b32tab[(c1 >> 1) & 0x1f], # bits 11 - 15
+                          _b32tab[c2 >> 12],         # bits 16 - 20 (1 - 5)
+                          _b32tab[(c2 >> 7) & 0x1f], # bits 21 - 25 (6 - 10)
+                          _b32tab[(c2 >> 2) & 0x1f], # bits 26 - 30 (11 - 15)
+                          _b32tab[c3 >> 5],          # bits 31 - 35 (1 - 5)
+                          _b32tab[c3 & 0x1f],        # bits 36 - 40 (1 - 5)
+                          ])
+    # Adjust for any leftover partial quanta
+    if leftover == 1:
+        return encoded[:-6] + b'======'
+    elif leftover == 2:
+        return encoded[:-4] + b'===='
+    elif leftover == 3:
+        return encoded[:-3] + b'==='
+    elif leftover == 4:
+        return encoded[:-1] + b'='
+    return encoded
+
+
+def b32decode(s, casefold=False, map01=None):
+    """Decode a Base32 encoded byte string.
+
+    s is the byte string to decode.  Optional casefold is a flag
+    specifying whether a lowercase alphabet is acceptable as input.
+    For security purposes, the default is False.
+
+    RFC 3548 allows for optional mapping of the digit 0 (zero) to the
+    letter O (oh), and for optional mapping of the digit 1 (one) to
+    either the letter I (eye) or letter L (el).  The optional argument
+    map01 when not None, specifies which letter the digit 1 should be
+    mapped to (when map01 is not None, the digit 0 is always mapped to
+    the letter O).  For security purposes the default is None, so that
+    0 and 1 are not allowed in the input.
+
+    The decoded byte string is returned.  binascii.Error is raised if
+    the input is incorrectly padded or if there are non-alphabet
+    characters present in the input.
+    """
+    s = _bytes_from_decode_data(s)
+    quanta, leftover = divmod(len(s), 8)
+    if leftover:
+        raise binascii.Error('Incorrect padding')
+    # Handle section 2.4 zero and one mapping.  The flag map01 will be either
+    # False, or the character to map the digit 1 (one) to.  It should be
+    # either L (el) or I (eye).
+    if map01 is not None:
+        map01 = _bytes_from_decode_data(map01)
+        assert len(map01) == 1, repr(map01)
+        s = s.translate(bytes.maketrans(b'01', b'O' + map01))
+    if casefold:
+        s = s.upper()
+    # Strip off pad characters from the right.  We need to count the pad
+    # characters because this will tell us how many null bytes to remove from
+    # the end of the decoded string.
+    padchars = 0
+    mo = re.search(b'(?P<pad>[=]*)$', s)
+    if mo:
+        padchars = len(mo.group('pad'))
+        if padchars > 0:
+            s = s[:-padchars]
+    # Now decode the full quanta
+    parts = []
+    acc = 0
+    shift = 35
+    for c in s:
+        val = _b32rev.get(c)
+        if val is None:
+            raise TypeError('Non-base32 digit found')
+        acc += _b32rev[c] << shift
+        shift -= 5
+        if shift < 0:
+            parts.append(binascii.unhexlify(bytes('%010x' % acc, "ascii")))
+            acc = 0
+            shift = 35
+    # Process the last, partial quanta
+    last = binascii.unhexlify(bytes('%010x' % acc, "ascii"))
+    if padchars == 0:
+        last = b''                      # No characters
+    elif padchars == 1:
+        last = last[:-1]
+    elif padchars == 3:
+        last = last[:-2]
+    elif padchars == 4:
+        last = last[:-3]
+    elif padchars == 6:
+        last = last[:-4]
+    else:
+        raise binascii.Error('Incorrect padding')
+    parts.append(last)
+    return b''.join(parts)
+
+
+
+# RFC 3548, Base 16 Alphabet specifies uppercase, but hexlify() returns
+# lowercase.  The RFC also recommends against accepting input case
+# insensitively.
+def b16encode(s):
+    """Encode a byte string using Base16.
+
+    s is the byte string to encode.  The encoded byte string is returned.
+    """
+    if not isinstance(s, bytes_types):
+        raise TypeError("expected bytes, not %s" % s.__class__.__name__)
+    return binascii.hexlify(s).upper()
+
+
+def b16decode(s, casefold=False):
+    """Decode a Base16 encoded byte string.
+
+    s is the byte string to decode.  Optional casefold is a flag
+    specifying whether a lowercase alphabet is acceptable as input.
+    For security purposes, the default is False.
+
+    The decoded byte string is returned.  binascii.Error is raised if
+    s were incorrectly padded or if there are non-alphabet characters
+    present in the string.
+    """
+    s = _bytes_from_decode_data(s)
+    if casefold:
+        s = s.upper()
+    if re.search(b'[^0-9A-F]', s):
+        raise binascii.Error('Non-base16 digit found')
+    return binascii.unhexlify(s)
+
+
+
+# Legacy interface.  This code could be cleaned up since I don't believe
+# binascii has any line length limitations.  It just doesn't seem worth it
+# though.  The files should be opened in binary mode.
+
+MAXLINESIZE = 76 # Excluding the CRLF
+MAXBINSIZE = (MAXLINESIZE//4)*3
+
+def encode(input, output):
+    """Encode a file; input and output are binary files."""
+    while True:
+        s = input.read(MAXBINSIZE)
+        if not s:
+            break
+        while len(s) < MAXBINSIZE:
+            ns = input.read(MAXBINSIZE-len(s))
+            if not ns:
+                break
+            s += ns
+        line = binascii.b2a_base64(s)
+        output.write(line)
+
+
+def decode(input, output):
+    """Decode a file; input and output are binary files."""
+    while True:
+        line = input.readline()
+        if not line:
+            break
+        s = binascii.a2b_base64(line)
+        output.write(s)
+
+
+def encodebytes(s):
+    """Encode a bytestring into a bytestring containing multiple lines
+    of base-64 data."""
+    if not isinstance(s, bytes_types):
+        raise TypeError("expected bytes, not %s" % s.__class__.__name__)
+    pieces = []
+    for i in range(0, len(s), MAXBINSIZE):
+        chunk = s[i : i + MAXBINSIZE]
+        pieces.append(binascii.b2a_base64(chunk))
+    return b"".join(pieces)
+
+def encodestring(s):
+    """Legacy alias of encodebytes()."""
+    import warnings
+    warnings.warn("encodestring() is a deprecated alias, use encodebytes()",
+                  DeprecationWarning, 2)
+    return encodebytes(s)
+
+
+def decodebytes(s):
+    """Decode a bytestring of base-64 data into a bytestring."""
+    if not isinstance(s, bytes_types):
+        raise TypeError("expected bytes, not %s" % s.__class__.__name__)
+    return binascii.a2b_base64(s)
+
+def decodestring(s):
+    """Legacy alias of decodebytes()."""
+    import warnings
+    warnings.warn("decodestring() is a deprecated alias, use decodebytes()",
+                  DeprecationWarning, 2)
+    return decodebytes(s)
+
+
+# Usable as a script...
+def main():
+    """Small main program"""
+    import sys, getopt
+    try:
+        opts, args = getopt.getopt(sys.argv[1:], 'deut')
+    except getopt.error as msg:
+        sys.stdout = sys.stderr
+        print(msg)
+        print("""usage: %s [-d|-e|-u|-t] [file|-]
+        -d, -u: decode
+        -e: encode (default)
+        -t: encode and decode string 'Aladdin:open sesame'"""%sys.argv[0])
+        sys.exit(2)
+    func = encode
+    for o, a in opts:
+        if o == '-e': func = encode
+        if o == '-d': func = decode
+        if o == '-u': func = decode
+        if o == '-t': test(); return
+    if args and args[0] != '-':
+        with open(args[0], 'rb') as f:
+            func(f, sys.stdout.buffer)
+    else:
+        func(sys.stdin.buffer, sys.stdout.buffer)
+
+
+def test():
+    s0 = b"Aladdin:open sesame"
+    print(repr(s0))
+    s1 = encodebytes(s0)
+    print(repr(s1))
+    s2 = decodebytes(s1)
+    print(repr(s2))
+    assert s0 == s2
+
+
+if __name__ == '__main__':
+    main()