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 a u8 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

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 {}
 }