add tests folder and run-tests script

run-tests

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+#!/usr/bin/env python
+
+import os
+import sys
+import re
+from subprocess import Popen, PIPE
+
+def main(argv):
+    tests = sorted(filter(lambda x: x.endswith('.jtl'), os.listdir('tests')))
+    for t in tests:
+        passed = True
+        test_name = re.sub(r'\.jtl$', '', t)
+        test_source = 'tests/' + t
+        exe = 'tests/' + test_name
+        if os.path.exists(exe):
+            os.unlink(exe)
+        Popen(['./jtlc', '-o', exe, test_source]).wait()
+        if os.path.exists(exe):
+            output = Popen([exe], stdout=PIPE).communicate()[0]
+            if os.path.exists(exe + '.out'):
+                f = open(exe + '.out', 'r')
+                expected = f.read()
+                f.close()
+                if output != expected:
+                    passed = False
+                    sys.stdout.write('Expected:\n')
+                    sys.stdout.write(expected)
+                    sys.stdout.write('\n')
+                    sys.stdout.write('Actual:\n')
+                    sys.stdout.write(output)
+        sys.stdout.write(test_name + ': ')
+        sys.stdout.write('PASS' if passed else 'FAIL')
+        sys.stdout.write('\n')
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))

tests/.gitignore

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+test???

tests/test001.jtl

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+
+C("#include <stdio.h>");
+
+C("int main(int argc, char *argv[])");
+C("{");
+
+    C("printf(\"Hello, World!\\n\");");
+    C("return 42;");
+
+C("}");

tests/test001.out

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+Hello, World!