Implement Execution Test

[Alexius-Huang]

What?
Currently Wyrd test samples has already tested the whole compilation process, however, it hasn't implement any tests which checks the correctness of the execution result from the compilation.

Why?
It is better to implement tests throughout the whole compilation to execution result.

How?
For instance, to test this code:

Num foo = 123

We need to verify if the variable foo is indeed result number 123.

Other approaches might be checking the last line output result:

1 + 2
3 + 4

Should verify the result as 7 since the compiled last line's evaluation result is 7