mirror of https://github.com/rust-lang/rust
104 lines
2.3 KiB
Rust
104 lines
2.3 KiB
Rust
#![feature(coverage_attribute)]
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//@ edition: 2021
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//@ min-llvm-version: 18
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//@ compile-flags: -Zcoverage-options=mcdc
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//@ llvm-cov-flags: --show-mcdc
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fn mcdc_check_neither(a: bool, b: bool) {
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if a && b {
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say("a and b");
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} else {
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say("not both");
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}
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}
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fn mcdc_check_a(a: bool, b: bool) {
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if a && b {
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say("a and b");
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} else {
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say("not both");
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}
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}
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fn mcdc_check_b(a: bool, b: bool) {
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if a && b {
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say("a and b");
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} else {
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say("not both");
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}
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}
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fn mcdc_check_both(a: bool, b: bool) {
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if a && b {
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say("a and b");
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} else {
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say("not both");
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}
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}
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fn mcdc_check_tree_decision(a: bool, b: bool, c: bool) {
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// This expression is intentionally written in a way
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// where 100% branch coverage indicates 100% mcdc coverage.
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if a && (b || c) {
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say("pass");
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} else {
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say("reject");
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}
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}
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fn mcdc_check_not_tree_decision(a: bool, b: bool, c: bool) {
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// Contradict to `mcdc_check_tree_decision`,
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// 100% branch coverage of this expression does not mean indicates 100% mcdc coverage.
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if (a || b) && c {
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say("pass");
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} else {
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say("reject");
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}
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}
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fn mcdc_nested_if(a: bool, b: bool, c: bool) {
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if a || b {
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say("a or b");
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if b && c {
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say("b and c");
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}
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} else {
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say("neither a nor b");
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}
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}
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#[coverage(off)]
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fn main() {
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mcdc_check_neither(false, false);
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mcdc_check_neither(false, true);
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mcdc_check_a(true, true);
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mcdc_check_a(false, true);
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mcdc_check_b(true, true);
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mcdc_check_b(true, false);
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mcdc_check_both(false, true);
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mcdc_check_both(true, true);
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mcdc_check_both(true, false);
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mcdc_check_tree_decision(false, true, true);
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mcdc_check_tree_decision(true, true, false);
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mcdc_check_tree_decision(true, false, false);
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mcdc_check_tree_decision(true, false, true);
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mcdc_check_not_tree_decision(false, true, true);
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mcdc_check_not_tree_decision(true, true, false);
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mcdc_check_not_tree_decision(true, false, false);
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mcdc_check_not_tree_decision(true, false, true);
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mcdc_nested_if(true, false, true);
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mcdc_nested_if(true, true, true);
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mcdc_nested_if(true, true, false);
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}
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#[coverage(off)]
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fn say(message: &str) {
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core::hint::black_box(message);
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}
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