The main logic of my function is a switch case, with the default case being the abnormal case.

function main(input) {
   let result = process(input)
   switch (result): {
     //normal cases
     case A:
        processA();
        break;
     case B:
        processB();
        break;
     ...
     default:
     handle_abnormal()
   }
   //further process input
   process2(input) 

}

As the above pseudo codes show the main login of my function are 3 steps: 1. process input 2. switch case the processed result 3. further processing the result.

To test main(), at some point the switch case block added a test case. The test logic is to send the input with some test data, then switch case handle that test case.

function main(input) {
   let result = process(input)
   switch (result): {
     //This is a test case
     case T:
        processT();
        break;
     //normal cases
     case A:
        processA();
        break;
     case B:
        processB();
        break;
     default:
        handle_abnormal()
   }
   //further process input
   process2(input)  
}

There were two reasons to add that back then, 1. it is easier to generate the test data (than the normal cases) 2 with that test case we can easily verify the whole processing of main() run as expected.

But now that test codes exist in the production codes! Although I have to say because of that test codes I am indeed feel more confident when refactor the main() function.

I have been trying to remove the test case from the production code, but to no avail.

1. typescript does not support preprocessor, e.g. https://stackoverflow.com/questions/32906097/preprocessor-defines-in-typescript so I don’t have a preprocessor to remove it.

2. Although terser has “conditional-compilation” to remove dead codes, but I find it won’t work in my case. Through my test, terse’s conditional-compilation is quite limited.

3. I have tried to write some standalone test code to test my main function so I can move that test case in to the test code. But because it is inside that switch case block I can’t find an easy way to move it out (at some point I just feel it does not worth the effort)

How do I remove those test codes out ? Or it is just not worth the effort ?