Added a rudimentary test framework

Tests can be found in 'tests/test_blah.sh'
Tests can be run with 'make test'

tests/test.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+
+import re
+import sys
+import subprocess
+import os
+
+def generate(test):
+    with open("tests/template.fmt") as file:
+        template = file.read()
+
+    lines = []
+
+    for line in test:
+        if '=>' in line:
+            test, expect = line.strip().strip(';').split('=>')
+            lines.append('res = {test};'.format(test=test.strip()))
+            lines.append('test_assert("{name}", res, {expect});'.format(
+                    name = re.match('\w*', test.strip()).group(),
+                    expect = expect.strip()))
+        else:
+            lines.append(line.strip())
+
+    with open('test.c', 'w') as file:
+        file.write(template.format(tests='\n'.join(4*' ' + l for l in lines)))
+
+def compile():
+    os.environ['DEBUG'] = '1'
+    os.environ['CFLAGS'] = '-Werror'
+    subprocess.check_call(['make', '--no-print-directory', '-s'], env=os.environ)
+
+def execute():
+    subprocess.check_call(["./lfs"])
+
+def main(test=None):
+    if test:
+        with open(test) as file:
+            generate(file)
+    else:
+        generate(sys.stdin)
+
+    compile()
+    execute()
+
+if __name__ == "__main__":
+    main(*sys.argv[1:])