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Testing and Assertion


Assert Statement

assert takes a bool value. If false, immediately exit script with non-zero code.

assert(1 == 1)
assert(1 == 2) // assertion failed


assert takes a message as second argument desplayed when the assertion fails.

fn div(a: int, b: int): int {
  assert(b == 0, 'divide by zero')
  return a / b

Testing function

A function have #[test] attribute is a testing function. Testing functions are compiled only in test-mode and skipped for normal compilation.

If an assertion fails within a test function, only that test will be terminated and other tests will run.

// test.li
namespace tests {
  fn test_fail() {

  fn test_ok() {

Use the lic test command to run tests.

lic test test.li

You run the above command, then you take the following results.

testing tests::test_fail ... FAILED
testing tests::test_ok ... OK

LINE 9: Assertion Failed

test result: FAILED
2 total; 1 passed; 1 failed;

Copyright © zakuro <z@kuro.red>

Design by zakuro & Yuki Amane (Pianoforte)