Add test suite runner.

This is just a proof of concept for now; when a test fails, it ought
to print a more useful diff of what changed.

src/run-shape-tests.py

@@ -0,0 +1,47 @@
+#!/usr/bin/python
+
+# Copyright (C) 2010  Evan Martin <martine@danga.com>
+#
+#  This is part of HarfBuzz, an OpenType Layout engine library.
+#
+# Permission is hereby granted, without written agreement and without
+# license or royalty fees, to use, copy, modify, and distribute this
+# software and its documentation for any purpose, provided that the
+# above copyright notice and the following two paragraphs appear in
+# all copies of this software.
+#
+# IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+# DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+# ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+# IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+# DAMAGE.
+#
+# THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+# BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+# FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+# ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+# PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+
+import os
+import simplejson as json
+import subprocess
+import sys
+
+count = 0
+for filename in os.listdir('shape-tests'):
+    testcase = json.loads(open('shape-tests/' + filename).read())
+
+    command = ['./shape']
+    if 'rtl' in testcase:
+        command.append('--rtl')
+    # XXX generalize font paths/names/hashes.
+    command.append('/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf')
+    command.append(testcase['input'])
+
+    output = subprocess.Popen(command, stdout=subprocess.PIPE).communicate()[0]
+    result = json.loads(output)
+
+    assert testcase == result
+    count += 1
+
+print "Ran %d test cases." % count