Now you will see how the main script passes a key-value pair ["var1":"Hello, world!"] to the TC1 script. The name-value pair is carried around in an instance of TestCaseBinding class.
The “Variables” tab of test case is no relevant to the callTestCase() keyword. The “Variables” tab is all about Data-drivin testing, as @ThanTo mentioned at Parameters in the called test case should not be displayed underlined - #3 by ThanhTo