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#![feature(coverage_attribute)]
//@ edition: 2021
//@ min-llvm-version: 19
//@ compile-flags: -Zcoverage-options=mcdc
//@ llvm-cov-flags: --show-branches=count --show-mcdc
fn mcdc_check_neither(a: bool, b: bool) {
if a && b {
say("a and b");
} else {
say("not both");
}
}
fn mcdc_check_a(a: bool, b: bool) {
if a && b {
say("a and b");
} else {
say("not both");
}
}
fn mcdc_check_b(a: bool, b: bool) {
if a && b {
say("a and b");
} else {
say("not both");
}
}
fn mcdc_check_both(a: bool, b: bool) {
if a && b {
say("a and b");
} else {
say("not both");
}
}
fn mcdc_check_tree_decision(a: bool, b: bool, c: bool) {
// This expression is intentionally written in a way
// where 100% branch coverage indicates 100% mcdc coverage.
if a && (b || c) {
say("pass");
} else {
say("reject");
}
}
fn mcdc_check_not_tree_decision(a: bool, b: bool, c: bool) {
// Contradict to `mcdc_check_tree_decision`,
// 100% branch coverage of this expression does not indicate 100% mcdc coverage.
if (a || b) && c {
say("pass");
} else {
say("reject");
}
}
fn mcdc_nested_if(a: bool, b: bool, c: bool) {
if a || b {
say("a or b");
if b && c {
say("b and c");
}
} else {
say("neither a nor b");
}
}
#[coverage(off)]
fn main() {
mcdc_check_neither(false, false);
mcdc_check_neither(false, true);
mcdc_check_a(true, true);
mcdc_check_a(false, true);
mcdc_check_b(true, true);
mcdc_check_b(true, false);
mcdc_check_both(false, true);
mcdc_check_both(true, true);
mcdc_check_both(true, false);
mcdc_check_tree_decision(false, true, true);
mcdc_check_tree_decision(true, true, false);
mcdc_check_tree_decision(true, false, false);
mcdc_check_tree_decision(true, false, true);
mcdc_check_not_tree_decision(false, true, true);
mcdc_check_not_tree_decision(true, true, false);
mcdc_check_not_tree_decision(true, false, false);
mcdc_check_not_tree_decision(true, false, true);
mcdc_nested_if(true, false, true);
mcdc_nested_if(true, true, true);
mcdc_nested_if(true, true, false);
}
#[coverage(off)]
fn say(message: &str) {
core::hint::black_box(message);
}
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