diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 7909396e..56ed4a03 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -9,6 +9,9 @@
 **Fixed**
 
 - fix #942: type_match None
+- fix: override referenced testcase export in teststep
+- fix: avoid duplicate import
+- fix: override locust weight
 
 ## 3.1.0 (2020-06-21)
 
diff --git a/examples/postman_echo/request_methods/demo_testsuite_yml/request_with_functions_test.py b/examples/postman_echo/request_methods/demo_testsuite_yml/request_with_functions_test.py
index 912fddad..7030055a 100644
--- a/examples/postman_echo/request_methods/demo_testsuite_yml/request_with_functions_test.py
+++ b/examples/postman_echo/request_methods/demo_testsuite_yml/request_with_functions_test.py
@@ -57,6 +57,9 @@ class TestCaseRequestWithFunctions(HttpRunner):
                 "body.data",
                 "This is expected to be sent back as part of response body: bar12-$expect_foo2-bar21.",
             )
+            .assert_type_match("body.json", "None")
+            .assert_type_match("body.json", "NoneType")
+            .assert_type_match("body.json", None)
         ),
         Step(
             RunRequest("post form data")
@@ -70,7 +73,7 @@ class TestCaseRequestWithFunctions(HttpRunner):
             )
             .with_data("foo1=$foo1&foo2=$foo2&foo3=$foo3")
             .validate()
-            .assert_equal("status_code", 200)
+            .assert_equal("status_code", 200, "response status code should be 200")
             .assert_equal("body.form.foo1", "$expect_foo1")
             .assert_equal("body.form.foo2", "bar23")
             .assert_equal("body.form.foo3", "bar21")