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diff --git a/vendor/psy/psysh/test/tools/gen_unvis_fixtures.py b/vendor/psy/psysh/test/tools/gen_unvis_fixtures.py
new file mode 100755
index 000000000..e02a74145
--- /dev/null
+++ b/vendor/psy/psysh/test/tools/gen_unvis_fixtures.py
@@ -0,0 +1,94 @@
+#! /usr/bin/env python3
+import sys
+from os.path import abspath, expanduser, dirname, join
+from itertools import chain
+import json
+import argparse
+
+from vis import vis, unvis, VIS_WHITE
+
+
+__dir__ = dirname(abspath(__file__))
+
+OUTPUT_FILE = join(__dir__, '..', 'fixtures', 'unvis_fixtures.json')
+
+# Add custom fixtures here
+CUSTOM_FIXTURES = [
+    # test long multibyte string
+    ''.join(chr(cp) for cp in range(1024)),
+    'foo bar',
+    'foo\nbar',
+    "$bar = 'baz';",
+    r'$foo = "\x20\\x20\\\x20\\\\x20"',
+    '$foo = function($bar) use($baz) {\n\treturn $baz->getFoo()\n};'
+]
+
+RANGES = {
+    # All valid codepoints in the BMP
+    'bmp': chain(range(0x0000, 0xD800), range(0xE000, 0xFFFF)),
+    # Smaller set of pertinent? codepoints inside BMP
+    # see: http://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane
+    'small': chain(
+        # latin blocks
+        range(0x0000, 0x0250),
+        # Greek, Cyrillic
+        range(0x0370, 0x0530),
+        # Hebrew, Arabic
+        range(0x590, 0x0700),
+        # CJK radicals
+        range(0x2E80, 0x2F00),
+        # Hiragana, Katakana
+        range(0x3040, 0x3100)
+    )
+}
+
+
+if __name__ == '__main__':
+
+    argp = argparse.ArgumentParser(
+        description='Generates test data for Psy\\Test\\Util\\StrTest')
+    argp.add_argument('-f', '--format-output', action='store_true',
+                      help='Indent JSON output to ease debugging')
+    argp.add_argument('-a', '--all', action='store_true',
+                      help="""Generates test data for all codepoints of the BMP.
+                      (same as --range=bmp). WARNING: You will need quite
+                      a lot of RAM to run the testsuite !
+                      """)
+    argp.add_argument('-r', '--range',
+                      help="""Choose the range of codepoints used to generate
+                      test data.""",
+                      choices=list(RANGES.keys()),
+                      default='small')
+    argp.add_argument('-o', '--output-file',
+                      help="""Write test data to OUTPUT_FILE
+                      (defaults to PSYSH_DIR/test/fixtures)""")
+    args = argp.parse_args()
+
+    cp_range = RANGES['bmp'] if args.all else RANGES[args.range]
+    indent = 2 if args.format_output else None
+    if args.output_file:
+        OUTPUT_FILE = abspath(expanduser(args.output_file))
+
+    fixtures = []
+
+    # use SMALL_RANGE by default, it should be enough.
+    # use BMP_RANGE for a more complete smoke test
+    for codepoint in cp_range:
+        char = chr(codepoint)
+        encoded = vis(char, VIS_WHITE)
+        decoded = unvis(encoded)
+        fixtures.append((encoded, decoded))
+
+    # Add our own custom fixtures at the end,
+    # since they would fail anyway if one of the previous did.
+    for fixture in CUSTOM_FIXTURES:
+        encoded = vis(fixture, VIS_WHITE)
+        decoded = unvis(encoded)
+        fixtures.append((encoded, decoded))
+
+    with open(OUTPUT_FILE, 'w') as fp:
+        # dump as json to avoid backslashin and quotin nightmare
+        # between php and python
+        json.dump(fixtures, fp, indent=indent)
+
+    sys.exit(0)