diff --git a/bitbake/lib/bb/tests/utils.py b/bitbake/lib/bb/tests/utils.py
new file mode 100644
index 0000000..9171509
--- /dev/null
+++ b/bitbake/lib/bb/tests/utils.py
@@ -0,0 +1,378 @@
+# ex:ts=4:sw=4:sts=4:et
+# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+#
+# BitBake Tests for utils.py
+#
+# Copyright (C) 2012 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 bb
+import os
+import tempfile
+
+class VerCmpString(unittest.TestCase):
+
+    def test_vercmpstring(self):
+        result = bb.utils.vercmp_string('1', '2')
+        self.assertTrue(result < 0)
+        result = bb.utils.vercmp_string('2', '1')
+        self.assertTrue(result > 0)
+        result = bb.utils.vercmp_string('1', '1.0')
+        self.assertTrue(result < 0)
+        result = bb.utils.vercmp_string('1', '1.1')
+        self.assertTrue(result < 0)
+        result = bb.utils.vercmp_string('1.1', '1_p2')
+        self.assertTrue(result < 0)
+        result = bb.utils.vercmp_string('1.0', '1.0+1.1-beta1')
+        self.assertTrue(result < 0)
+        result = bb.utils.vercmp_string('1.1', '1.0+1.1-beta1')
+        self.assertTrue(result > 0)
+
+    def test_explode_dep_versions(self):
+        correctresult = {"foo" : ["= 1.10"]}
+        result = bb.utils.explode_dep_versions2("foo (= 1.10)")
+        self.assertEqual(result, correctresult)
+        result = bb.utils.explode_dep_versions2("foo (=1.10)")
+        self.assertEqual(result, correctresult)
+        result = bb.utils.explode_dep_versions2("foo ( = 1.10)")
+        self.assertEqual(result, correctresult)
+        result = bb.utils.explode_dep_versions2("foo ( =1.10)")
+        self.assertEqual(result, correctresult)
+        result = bb.utils.explode_dep_versions2("foo ( = 1.10 )")
+        self.assertEqual(result, correctresult)
+        result = bb.utils.explode_dep_versions2("foo ( =1.10 )")
+        self.assertEqual(result, correctresult)
+
+    def test_vercmp_string_op(self):
+        compareops = [('1', '1', '=', True),
+                      ('1', '1', '==', True),
+                      ('1', '1', '!=', False),
+                      ('1', '1', '>', False),
+                      ('1', '1', '<', False),
+                      ('1', '1', '>=', True),
+                      ('1', '1', '<=', True),
+                      ('1', '0', '=', False),
+                      ('1', '0', '==', False),
+                      ('1', '0', '!=', True),
+                      ('1', '0', '>', True),
+                      ('1', '0', '<', False),
+                      ('1', '0', '>>', True),
+                      ('1', '0', '<<', False),
+                      ('1', '0', '>=', True),
+                      ('1', '0', '<=', False),
+                      ('0', '1', '=', False),
+                      ('0', '1', '==', False),
+                      ('0', '1', '!=', True),
+                      ('0', '1', '>', False),
+                      ('0', '1', '<', True),
+                      ('0', '1', '>>', False),
+                      ('0', '1', '<<', True),
+                      ('0', '1', '>=', False),
+                      ('0', '1', '<=', True)]
+
+        for arg1, arg2, op, correctresult in compareops:
+            result = bb.utils.vercmp_string_op(arg1, arg2, op)
+            self.assertEqual(result, correctresult, 'vercmp_string_op("%s", "%s", "%s") != %s' % (arg1, arg2, op, correctresult))
+
+        # Check that clearly invalid operator raises an exception
+        self.assertRaises(bb.utils.VersionStringException, bb.utils.vercmp_string_op, '0', '0', '$')
+
+
+class Path(unittest.TestCase):
+    def test_unsafe_delete_path(self):
+        checkitems = [('/', True),
+                      ('//', True),
+                      ('///', True),
+                      (os.getcwd().count(os.sep) * ('..' + os.sep), True),
+                      (os.environ.get('HOME', '/home/test'), True),
+                      ('/home/someone', True),
+                      ('/home/other/', True),
+                      ('/home/other/subdir', False),
+                      ('', False)]
+        for arg1, correctresult in checkitems:
+            result = bb.utils._check_unsafe_delete_path(arg1)
+            self.assertEqual(result, correctresult, '_check_unsafe_delete_path("%s") != %s' % (arg1, correctresult))
+
+
+class EditMetadataFile(unittest.TestCase):
+    _origfile = """
+# A comment
+HELLO = "oldvalue"
+
+THIS = "that"
+
+# Another comment
+NOCHANGE = "samevalue"
+OTHER = 'anothervalue'
+
+MULTILINE = "a1 \\
+             a2 \\
+             a3"
+
+MULTILINE2 := " \\
+               b1 \\
+               b2 \\
+               b3 \\
+               "
+
+
+MULTILINE3 = " \\
+              c1 \\
+              c2 \\
+              c3 \\
+"
+
+do_functionname() {
+    command1 ${VAL1} ${VAL2}
+    command2 ${VAL3} ${VAL4}
+}
+"""
+    def _testeditfile(self, varvalues, compareto, dummyvars=None):
+        if dummyvars is None:
+            dummyvars = []
+        with tempfile.NamedTemporaryFile('w', delete=False) as tf:
+            tf.write(self._origfile)
+            tf.close()
+            try:
+                varcalls = []
+                def handle_file(varname, origvalue, op, newlines):
+                    self.assertIn(varname, varvalues, 'Callback called for variable %s not in the list!' % varname)
+                    self.assertNotIn(varname, dummyvars, 'Callback called for variable %s in dummy list!' % varname)
+                    varcalls.append(varname)
+                    return varvalues[varname]
+
+                bb.utils.edit_metadata_file(tf.name, varvalues.keys(), handle_file)
+                with open(tf.name) as f:
+                    modfile = f.readlines()
+                # Ensure the output matches the expected output
+                self.assertEqual(compareto.splitlines(True), modfile)
+                # Ensure the callback function was called for every variable we asked for
+                # (plus allow testing behaviour when a requested variable is not present)
+                self.assertEqual(sorted(varvalues.keys()), sorted(varcalls + dummyvars))
+            finally:
+                os.remove(tf.name)
+
+
+    def test_edit_metadata_file_nochange(self):
+        # Test file doesn't get modified with nothing to do
+        self._testeditfile({}, self._origfile)
+        # Test file doesn't get modified with only dummy variables
+        self._testeditfile({'DUMMY1': ('should_not_set', None, 0, True),
+                        'DUMMY2': ('should_not_set_again', None, 0, True)}, self._origfile, dummyvars=['DUMMY1', 'DUMMY2'])
+        # Test file doesn't get modified with some the same values
+        self._testeditfile({'THIS': ('that', None, 0, True),
+                        'OTHER': ('anothervalue', None, 0, True),
+                        'MULTILINE3': ('               c1               c2               c3', None, 4, False)}, self._origfile)
+
+    def test_edit_metadata_file_1(self):
+
+        newfile1 = """
+# A comment
+HELLO = "newvalue"
+
+THIS = "that"
+
+# Another comment
+NOCHANGE = "samevalue"
+OTHER = 'anothervalue'
+
+MULTILINE = "a1 \\
+             a2 \\
+             a3"
+
+MULTILINE2 := " \\
+               b1 \\
+               b2 \\
+               b3 \\
+               "
+
+
+MULTILINE3 = " \\
+              c1 \\
+              c2 \\
+              c3 \\
+"
+
+do_functionname() {
+    command1 ${VAL1} ${VAL2}
+    command2 ${VAL3} ${VAL4}
+}
+"""
+        self._testeditfile({'HELLO': ('newvalue', None, 4, True)}, newfile1)
+
+
+    def test_edit_metadata_file_2(self):
+
+        newfile2 = """
+# A comment
+HELLO = "oldvalue"
+
+THIS = "that"
+
+# Another comment
+NOCHANGE = "samevalue"
+OTHER = 'anothervalue'
+
+MULTILINE = " \\
+    d1 \\
+    d2 \\
+    d3 \\
+    "
+
+MULTILINE2 := " \\
+               b1 \\
+               b2 \\
+               b3 \\
+               "
+
+
+MULTILINE3 = "nowsingle"
+
+do_functionname() {
+    command1 ${VAL1} ${VAL2}
+    command2 ${VAL3} ${VAL4}
+}
+"""
+        self._testeditfile({'MULTILINE': (['d1','d2','d3'], None, 4, False),
+                        'MULTILINE3': ('nowsingle', None, 4, True),
+                        'NOTPRESENT': (['a', 'b'], None, 4, False)}, newfile2, dummyvars=['NOTPRESENT'])
+
+
+    def test_edit_metadata_file_3(self):
+
+        newfile3 = """
+# A comment
+HELLO = "oldvalue"
+
+# Another comment
+NOCHANGE = "samevalue"
+OTHER = "yetanothervalue"
+
+MULTILINE = "e1 \\
+             e2 \\
+             e3 \\
+             "
+
+MULTILINE2 := "f1 \\
+\tf2 \\
+\t"
+
+
+MULTILINE3 = " \\
+              c1 \\
+              c2 \\
+              c3 \\
+"
+
+do_functionname() {
+    othercommand_one a b c
+    othercommand_two d e f
+}
+"""
+
+        self._testeditfile({'do_functionname()': (['othercommand_one a b c', 'othercommand_two d e f'], None, 4, False),
+                        'MULTILINE2': (['f1', 'f2'], None, '\t', True),
+                        'MULTILINE': (['e1', 'e2', 'e3'], None, -1, True),
+                        'THIS': (None, None, 0, False),
+                        'OTHER': ('yetanothervalue', None, 0, True)}, newfile3)
+
+
+    def test_edit_metadata_file_4(self):
+
+        newfile4 = """
+# A comment
+HELLO = "oldvalue"
+
+THIS = "that"
+
+# Another comment
+OTHER = 'anothervalue'
+
+MULTILINE = "a1 \\
+             a2 \\
+             a3"
+
+MULTILINE2 := " \\
+               b1 \\
+               b2 \\
+               b3 \\
+               "
+
+
+"""
+
+        self._testeditfile({'NOCHANGE': (None, None, 0, False),
+                        'MULTILINE3': (None, None, 0, False),
+                        'THIS': ('that', None, 0, False),
+                        'do_functionname()': (None, None, 0, False)}, newfile4)
+
+
+    def test_edit_metadata(self):
+        newfile5 = """
+# A comment
+HELLO = "hithere"
+
+# A new comment
+THIS += "that"
+
+# Another comment
+NOCHANGE = "samevalue"
+OTHER = 'anothervalue'
+
+MULTILINE = "a1 \\
+             a2 \\
+             a3"
+
+MULTILINE2 := " \\
+               b1 \\
+               b2 \\
+               b3 \\
+               "
+
+
+MULTILINE3 = " \\
+              c1 \\
+              c2 \\
+              c3 \\
+"
+
+NEWVAR = "value"
+
+do_functionname() {
+    command1 ${VAL1} ${VAL2}
+    command2 ${VAL3} ${VAL4}
+}
+"""
+
+
+        def handle_var(varname, origvalue, op, newlines):
+            if varname == 'THIS':
+                newlines.append('# A new comment\n')
+            elif varname == 'do_functionname()':
+                newlines.append('NEWVAR = "value"\n')
+                newlines.append('\n')
+            valueitem = varvalues.get(varname, None)
+            if valueitem:
+                return valueitem
+            else:
+                return (origvalue, op, 0, True)
+
+        varvalues = {'HELLO': ('hithere', None, 0, True), 'THIS': ('that', '+=', 0, True)}
+        varlist = ['HELLO', 'THIS', 'do_functionname()']
+        (updated, newlines) = bb.utils.edit_metadata(self._origfile.splitlines(True), varlist, handle_var)
+        self.assertTrue(updated, 'List should be updated but isn\'t')
+        self.assertEqual(newlines, newfile5.splitlines(True))