tests

tests are written in src/test

tests that test the language will be in the lang subdirectory
tests that test lily will be in the lily subdirectory
all tests should return u8, void, or bool as a status code.

follow standard status code practices for value.
0 for success, 1 for error, etc
all tests should contain the test specification at the top of the file
- all test arguments are optional
  
  tests with no arguments will always pass
- delimiting whitespace is optional, provided each test argument is prepended with a newline and a *
- timeout is formatted like 0.5s. if a test exceeds this time, it will fail.
- args are given to the application executable
- exit is the exit status of the program (return code)
if test compilation fails, the test will be considered failed
tests for lily should try to limit the number of unrelated structures/functions tested.
tests for lang should be headless (not rely on lily at all)

the following are all of the (currently) supported test arguments:

/*
 * exit: u8
 * args: str
 * stdout: str
 * timeout: time
 */

a trivial example test:

/*
 * timeout: 0.5s
 */

 main := fn(): void {
    // test will fail after 0.5s
    loop {}
 }