how to choose what paths to test in unit testing code example

Example 1: unittest run specific test

python -m unittest mypkg.tests.test_module.TestClass.test_method
# In your case, this would be:
python -m unittest testMyCase.MyCase.testItIsHot

Example 2: what is a unit testable code

public class SomeClass
{
    public SomeClass(calculatedParams)
    {
        ...
    }
}

    public interface ISomeClassCreator
    {
        SomeClass Create(params);
    }

public class SomeClassCreator: ISomeClassCreator
{
    public SomeClass Create(params)
    {
        ...
    }
}