diff --git a/bitbake/lib/bb/tests/parse.py b/bitbake/lib/bb/tests/parse.py
new file mode 100644
index 0000000..6beb76a
--- /dev/null
+++ b/bitbake/lib/bb/tests/parse.py
@@ -0,0 +1,147 @@
+# ex:ts=4:sw=4:sts=4:et
+# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+#
+# BitBake Test for lib/bb/parse/
+#
+# Copyright (C) 2015 Richard Purdie
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+
+import unittest
+import tempfile
+import logging
+import bb
+import os
+
+logger = logging.getLogger('BitBake.TestParse')
+
+import bb.parse
+import bb.data
+import bb.siggen
+
+class ParseTest(unittest.TestCase):
+
+    testfile = """
+A = "1"
+B = "2"
+do_install() {
+	echo "hello"
+}
+
+C = "3"
+"""
+
+    def setUp(self):
+        self.d = bb.data.init()
+        bb.parse.siggen = bb.siggen.init(self.d)
+
+    def parsehelper(self, content, suffix = ".bb"):
+
+        f = tempfile.NamedTemporaryFile(suffix = suffix)
+        f.write(content)
+        f.flush()
+        os.chdir(os.path.dirname(f.name))
+        return f
+
+    def test_parse_simple(self):
+        f = self.parsehelper(self.testfile)
+        d = bb.parse.handle(f.name, self.d)['']
+        self.assertEqual(d.getVar("A", True), "1")
+        self.assertEqual(d.getVar("B", True), "2")
+        self.assertEqual(d.getVar("C", True), "3")
+
+    def test_parse_incomplete_function(self):
+        testfileB = self.testfile.replace("}", "")
+        f = self.parsehelper(testfileB)
+        with self.assertRaises(bb.parse.ParseError):
+            d = bb.parse.handle(f.name, self.d)['']
+
+    overridetest = """
+RRECOMMENDS_${PN} = "a"
+RRECOMMENDS_${PN}_libc = "b"
+OVERRIDES = "libc:${PN}"
+PN = "gtk+"
+"""
+
+    def test_parse_overrides(self):
+        f = self.parsehelper(self.overridetest)
+        d = bb.parse.handle(f.name, self.d)['']
+        self.assertEqual(d.getVar("RRECOMMENDS", True), "b")
+        bb.data.expandKeys(d)
+        self.assertEqual(d.getVar("RRECOMMENDS", True), "b")
+        d.setVar("RRECOMMENDS_gtk+", "c")
+        self.assertEqual(d.getVar("RRECOMMENDS", True), "c")
+
+    overridetest2 = """
+EXTRA_OECONF = ""
+EXTRA_OECONF_class-target = "b"
+EXTRA_OECONF_append = " c"
+"""
+
+    def test_parse_overrides(self):
+        f = self.parsehelper(self.overridetest2)
+        d = bb.parse.handle(f.name, self.d)['']
+        d.appendVar("EXTRA_OECONF", " d")
+        d.setVar("OVERRIDES", "class-target")
+        self.assertEqual(d.getVar("EXTRA_OECONF", True), "b c d")
+
+    overridetest3 = """
+DESCRIPTION = "A"
+DESCRIPTION_${PN}-dev = "${DESCRIPTION} B"
+PN = "bc"
+"""
+
+    def test_parse_combinations(self):
+        f = self.parsehelper(self.overridetest3)
+        d = bb.parse.handle(f.name, self.d)['']
+        bb.data.expandKeys(d)
+        self.assertEqual(d.getVar("DESCRIPTION_bc-dev", True), "A B")
+        d.setVar("DESCRIPTION", "E")
+        d.setVar("DESCRIPTION_bc-dev", "C D")
+        d.setVar("OVERRIDES", "bc-dev")
+        self.assertEqual(d.getVar("DESCRIPTION", True), "C D")
+
+
+    classextend = """
+VAR_var_override1 = "B"
+EXTRA = ":override1"
+OVERRIDES = "nothing${EXTRA}"
+
+BBCLASSEXTEND = "###CLASS###"
+"""
+    classextend_bbclass = """
+EXTRA = ""
+python () {
+    d.renameVar("VAR_var", "VAR_var2")
+}
+"""
+
+    #
+    # Test based upon a real world data corruption issue. One
+    # data store changing a variable poked through into a different data
+    # store. This test case replicates that issue where the value 'B' would 
+    # become unset/disappear.
+    #
+    def test_parse_classextend_contamination(self):
+        cls = self.parsehelper(self.classextend_bbclass, suffix=".bbclass")
+        #clsname = os.path.basename(cls.name).replace(".bbclass", "")
+        self.classextend = self.classextend.replace("###CLASS###", cls.name)
+        f = self.parsehelper(self.classextend)
+        alldata = bb.parse.handle(f.name, self.d)
+        d1 = alldata['']
+        d2 = alldata[cls.name]
+        self.assertEqual(d1.getVar("VAR_var", True), "B")
+        self.assertEqual(d2.getVar("VAR_var", True), None)
+