Custom Scripts: How to use class variables in other methods (like tests_)

[netgab]

Hi community,
I'm pretty new to custom scripting and have a very basic question:

My custom script uses input fields / variables, which are defined in class level (Script).
Example:

class MyTestScript(Script):
    class Meta:
        name = "My test script"

    input_param1 = StringVar(
        label="My input parameter",
        required=True
    )

Based on the examples, I know I can access this variable in the run() class method using the data dictionary:

    def run(self, data, commit):
        self.log_info(f"Param1: {data['input_param1']}")

How to access this variable within a Test class method (method prefix test_)?
Based on the documentation, the test_ methods, only accept the self argument (no data). Within a test_ method, I thought, that I might access the class variables using self.input_param1:

    def test_param(self):
        self.log_info(dir(self))
        # => This shows in the output, that there is the class propery `input_param1` in the class instance
        
        self.log_info(self.input_param1)
        # => this is None (no output)

Any ideas?