Environment reset is not needed at the end of the test, each one starts with clean env. The real problem was that the template_constant_dict has changed, so the expected output is now different - and should include sysroot and its value

Author: Caspar van Leeuwen

test/framework/easyconfig.py

@@ -1367,17 +1367,13 @@ 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()
@@ -3266,6 +3262,7 @@ def test_template_constant_dict(self):
             'nameletter': 'g',
             'nameletterlower': 'g',
             'parallel': None,
+            'sysroot': '',
             'toolchain_name': 'foss',
             'toolchain_version': '2018a',
             'version': '1.5',