fix: handle cases when parent directory name includes dot/hyphen/space

examples/postman_echo/request_methods/request_with_testcase_reference.yml

@@ -1,30 +0,0 @@
-config:
-    name: "request methods testcase: reference testcase"
-    variables:
-        foo1: session_bar1
-    base_url: "https://postman-echo.com"
-    verify: False
-
-teststeps:
--
-    name: request with functions
-    variables:
-        foo1: override_bar1
-    testcase: request_methods/request_with_functions.yml
-    export:
-        - session_foo2
--
-    name: post form data
-    variables:
-        foo1: bar1
-    request:
-        method: POST
-        url: /post
-        headers:
-            User-Agent: HttpRunner/${get_httprunner_version()}
-            Content-Type: "application/x-www-form-urlencoded"
-        data: "foo1=$foo1&foo2=$session_foo2"
-    validate:
-        - eq: ["status_code", 200]
-        - eq: ["body.form.foo1", "session_bar1"]
-        - eq: ["body.form.foo2", "session_bar2"]