test: check tga-to-png output

test/test.py

@@ -1,15 +1,29 @@
 #! /usr/bin/env python3
 
+import hashlib
 import os
 import subprocess
 import sys
 
+def print_status(message):
+    print(message, file=sys.stderr)
+
+def print_error(message):
+    print(message, file=sys.stderr)
+    exit(1)
+
 def print_command(command_list):
-    print("running: " + " ".join(command_list), file=sys.stderr)
+    print_status("Running command: {}".format(" ".join(command_list)))
 
 def convert_path(path):
     return path.replace("/", os.path.sep)
 
+def check_file(file_path, known_sum):
+    print_status("Checking file: {}".format(file_path))
+    check_sum = hashlib.blake2b(open(file_path, "rb").read()).hexdigest()
+    if check_sum != known_sum:
+        print_error("Error: {}'s checksum {} doesn't match {}".format(file_path, check_sum, known_sum))
+
 def run(command_list):
     print_command(command_list)
     returncode = subprocess.run(command_list).returncode
@@ -87,6 +101,16 @@ def crunch(input_path, output_path, options=[]):
 crunch("test/rle-top-left.tga", "build/test/tga-to-png/rle-top-left.png")
 crunch("test/rle-top-right.tga", "build/test/tga-to-png/rle-top-right.png")
 
+png_known_sum="6238f9678cd9fa774e6d50ee6638f316d0b1148ade344c06b4ddebac4738ea90e93c19d5cca405fccdabfdb37898bc7f9bccce1f0d974f9cbd18ab54b66adaa3"
+check_file("build/test/tga-to-png/raw-bottom-left.png", png_known_sum)
+check_file("build/test/tga-to-png/raw-bottom-right.png", png_known_sum)
+check_file("build/test/tga-to-png/raw-top-left.png", png_known_sum)
+check_file("build/test/tga-to-png/raw-top-right.png", png_known_sum)
+check_file("build/test/tga-to-png/rle-bottom-left.png", png_known_sum)
+check_file("build/test/tga-to-png/rle-bottom-right.png", png_known_sum)
+check_file("build/test/tga-to-png/rle-top-left.png", png_known_sum)
+check_file("build/test/tga-to-png/rle-top-right.png", png_known_sum)
+
 mkdir("build/test/tga-to-crn")
 crunch("test/raw-bottom-left.tga", "build/test/tga-to-crn/raw-bottom-left.crn")
 crunch("test/raw-bottom-right.tga", "build/test/tga-to-crn/raw-bottom-right.crn")