v2 / vlib / v / tests / supports__likely__test.v
32 lines · 29 sloc · 713 bytes · cbefe6c32f7784cbf54794b4c676bd278cced75c
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1// _likely_(expr) should be compilable, and it should return the expr


2fn test_likely_type() {


3    assert typeof(_likely_(false)).name == 'bool'


4    assert _likely_(false) == false


5    assert _likely_(true) == true


6}


7


8fn test_likely() {


9    if _likely_(2 < 10) {


10        assert true


11        eprintln('ok, happens every time')


12    } else {


13        eprintln('happens *infrequently*')


14        assert false


15    }


16}


17


18fn test_likely_returns_the_value_of_its_bool_argument() {


19    i := 123


20    if _likely_(i < 2) {


21        assert false


22    } else {


23        assert true


24    }


25}


26


27// _unlikely_ is the same as _likely_ from the V point of view:


28fn test_unlikely_type() {


29    assert typeof(_unlikely_(false)).name == 'bool'


30    assert _unlikely_(false) == false


31    assert _unlikely_(true) == true


32}


33