Add Python script to test the challenges directly

.gitignore

@@ -2,3 +2,4 @@
 build/
 compile_commands.json
 .clangd/
+tests/.mypy_cache/

tests/challenges.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python3
+from typing import List
+import subprocess
+
+
+def run_challenge(challenge: int, inputs: List[str], expected: List[str]) -> None:
+    print(f"[challenge {challenge:02}]", end=" ")
+    res = subprocess.run(
+        [f"../build/ex{challenge:02}", *inputs],
+        capture_output=True,
+        check=True,
+        text=True,
+    )
+
+    if not expected:
+        print(res.stdout)
+        return
+
+    assert all(
+        out in res.stdout for out in expected
+    ), f"Expected output:\n{expected}\nActual output:\n{res.stdout}"
+
+    print("OK")
+
+
+def main():
+    run_challenge(
+        challenge=1,
+        inputs=[
+            "49276d206b696c6c696e6720796f757220627261696e206c69"
+            "6b65206120706f69736f6e6f7573206d757368726f6f6d"
+        ],
+        expected=["SSdtIGtpbGxpbmcgeW91ciBicmFpbiBsaWtlIGEgcG9pc29ub3VzIG11c2hyb29t"],
+    )
+
+    run_challenge(
+        challenge=2,
+        inputs=[
+            "1c0111001f010100061a024b53535009181c",
+            "686974207468652062756c6c277320657965",
+        ],
+        expected=["746865206b696420646f6e277420706c6179"],
+    )
+
+    run_challenge(
+        challenge=3,
+        inputs=["1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736"],
+        expected=["Cooking MC's like a pound of bacon"],
+    )
+
+    run_challenge(
+        challenge=4, inputs=["../data/4.txt"], expected=["Now that the party is jumping\\n"],
+    )
+
+    run_challenge(
+        challenge=5,
+        inputs=["ICE", "../data/5.txt"],
+        expected=[
+            "0b3637272a2b2e63622c2e69692a23693a2a3c6324202d623d"
+            "63343c2a26226324272765272a282b2f20430a652e2c652a31"
+            "24333a653e2b2027630c692b20283165286326302e27282f"
+        ],
+    )
+
+    with open("output6.txt", "r") as f:
+        output6 = f.read()
+    run_challenge(
+        challenge=6,
+        inputs=["../data/6.txt"],
+        expected=["Terminator X: Bring the noise", output6],
+    )
+
+    run_challenge(
+        challenge=7, inputs=["YELLOW SUBMARINE", "../data/7.txt"], expected=[output6],
+    )
+
+
+if __name__ == "__main__":
+    main()

tests/output6.txt

@@ -0,0 +1,79 @@
+I'm back and I'm ringin' the bell 
+A rockin' on the mike while the fly girls yell 
+In ecstasy in the back of me 
+Well that's my DJ Deshay cuttin' all them Z's 
+Hittin' hard and the girlies goin' crazy 
+Vanilla's on the mike, man I'm not lazy. 
+
+I'm lettin' my drug kick in 
+It controls my mouth and I begin 
+To just let it flow, let my concepts go 
+My posse's to the side yellin', Go Vanilla Go! 
+
+Smooth 'cause that's the way I will be 
+And if you don't give a damn, then 
+Why you starin' at me 
+So get off 'cause I control the stage 
+There's no dissin' allowed 
+I'm in my own phase 
+The girlies sa y they love me and that is ok 
+And I can dance better than any kid n' play 
+
+Stage 2 -- Yea the one ya' wanna listen to 
+It's off my head so let the beat play through 
+So I can funk it up and make it sound good 
+1-2-3 Yo -- Knock on some wood 
+For good luck, I like my rhymes atrocious 
+Supercalafragilisticexpialidocious 
+I'm an effect and that you can bet 
+I can take a fly girl and make her wet. 
+
+I'm like Samson -- Samson to Delilah 
+There's no denyin', You can try to hang 
+But you'll keep tryin' to get my style 
+Over and over, practice makes perfect 
+But not if you're a loafer. 
+
+You'll get nowhere, no place, no time, no girls 
+Soon -- Oh my God, homebody, you probably eat 
+Spaghetti with a spoon! Come on and say it! 
+
+VIP. Vanilla Ice yep, yep, I'm comin' hard like a rhino 
+Intoxicating so you stagger like a wino 
+So punks stop trying and girl stop cryin' 
+Vanilla Ice is sellin' and you people are buyin' 
+'Cause why the freaks are jockin' like Crazy Glue 
+Movin' and groovin' trying to sing along 
+All through the ghetto groovin' this here song 
+Now you're amazed by the VIP posse. 
+
+Steppin' so hard like a German Nazi 
+Startled by the bases hittin' ground 
+There's no trippin' on mine, I'm just gettin' down 
+Sparkamatic, I'm hangin' tight like a fanatic 
+You trapped me once and I thought that 
+You might have it 
+So step down and lend me your ear 
+'89 in my time! You, '90 is my year. 
+
+You're weakenin' fast, YO! and I can tell it 
+Your body's gettin' hot, so, so I can smell it 
+So don't be mad and don't be sad 
+'Cause the lyrics belong to ICE, You can call me Dad 
+You're pitchin' a fit, so step back and endure 
+Let the witch doctor, Ice, do the dance to cure 
+So come up close and don't be square 
+You wanna battle me -- Anytime, anywhere 
+
+You thought that I was weak, Boy, you're dead wrong 
+So come on, everybody and sing this song 
+
+Say -- Play that funky music Say, go white boy, go white boy go 
+play that funky music Go white boy, go white boy, go 
+Lay down and boogie and play that funky music till you die. 
+
+Play that funky music Come on, Come on, let me hear 
+Play that funky music white boy you say it, say it 
+Play that funky music A little louder now 
+Play that funky music, white boy Come on, Come on, Come on 
+Play that funky music