Restore original sysroot at the end of test

Author: Caspar van Leeuwen

test/framework/easyconfig.py

@@ -1367,13 +1367,17 @@ def test_sysroot_template(self):
 
         # Validate the value of the sysroot template if sysroot is unset (i.e. the build option is None)
         # As a test, we'll set the sysroot to self.test_prefix, as it has to be a directory that is guaranteed to exist
+        old_sysroot = build_option('sysroot')
         update_build_option('sysroot', self.test_prefix)
 
         ec = EasyConfig(test_ec)
         self.assertEqual(ec['configopts'], "--some-opt=%s/" % self.test_prefix)
         self.assertEqual(ec['buildopts'], "--some-opt=%s/" % self.test_prefix)
         self.assertEqual(ec['installopts'], "--some-opt=%s/" % self.test_prefix)
 
+        # Restore original value for sysroot build option
+        update_build_option('sysroot', old_sysroot)
+
     def test_constant_doc(self):
         """test constant documentation"""
         doc = avail_easyconfig_constants()