enable branch checking (#47)

* enable branch checking

* trying something

* add another flag

* revert

* fix branching code cov

* now it ACs

* fix clippy warning

---------

Co-authored-by: Luke Videckis <lukevideckis@gmail.com>

Author: lrvideckis

.github/workflows/ci.yml

@@ -4,7 +4,7 @@ on: [push, workflow_dispatch]
 
 env:
   CARGO_TERM_COLOR: always
-  RUSTFLAGS: -D warnings -C instrument-coverage -C link-dead-code
+  RUSTFLAGS: -D warnings -C instrument-coverage -C link-dead-code -Z coverage-options=branch
   RUSTDOCFLAGS: -D warnings -D missing_docs
 
 jobs:

.github/workflows/code_cov.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# RUSTFLAGS="-C instrument-coverage -C link-dead-code" oj-verify run --tle 20 --jobs 4 examples/data_structures/rmq.rs
+# RUSTFLAGS="-C instrument-coverage -C link-dead-code -Z coverage-options=branch" oj-verify run --tle 20 --jobs 4 examples/data_structures/rmq.rs
 
 set -eo pipefail
 
@@ -8,6 +8,6 @@ cov_flags=(-Xdemangler=rustfilt --ignore-filename-regex='/.cargo/registry' --ins
 
 cargo profdata -- merge -sparse default_*.profraw -o ptc_rust.profdata
 # shellcheck disable=SC2068 # double quotes cause command to fail, not sure why
-cargo cov -- show ${cov_flags[@]} --use-color
+cargo cov -- show ${cov_flags[@]} --use-color --show-branches=count
 # shellcheck disable=SC2068
 cargo cov -- export ${cov_flags[@]} --summary-only | python .github/workflows/check_code_cov.py

examples/numbers/primes_is_prime.rs

@@ -6,6 +6,10 @@ use programming_team_code_rust::numbers::primes::Primes;
 fn main() {
     let primes = Primes::new(100_000_001);
 
+    for i in 0..=1 {
+        assert!(!primes.is_prime(i));
+    }
+
     input! {
         n: usize,
     }