test: add end-to-end test for coverage hooks

Runs bashunit on fixture file with coverage enabled to verify
the complete flow works correctly, including hook coverage attribution.

Skip test in parallel mode as coverage state is not shared across workers.

Author: Chemaclass

tests/acceptance/coverage_hooks_test.sh

@@ -7,6 +7,12 @@ function set_up_before_script() {
 }
 
 function test_coverage_includes_src_hits_from_setup_hook() {
+    # Skip in parallel mode - coverage state is not shared across workers
+    if bashunit::env::is_parallel_run_enabled; then
+        bashunit::skip "Coverage tests require sequential execution"
+        return
+    fi
+
     # Enable coverage in-process and exercise code in a hook-like context
     BASHUNIT_COVERAGE=true
     BASHUNIT_COVERAGE_PATHS="src/"