fix: random dir for parallel tests

Author: Chemaclass

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Fix typo "to has been called"
 - Add weekly downloads to the docs
+- Fix parallel runner
 
 ## [0.20.0](https://github.com/TypedDevs/bashunit/compare/0.19.1...0.20.0) - 2025-06-01
 

src/env.sh

@@ -120,7 +120,9 @@ function env::print_verbose() {
 }
 
 EXIT_CODE_STOP_ON_FAILURE=4
-TEMP_DIR_PARALLEL_TEST_SUITE="/tmp/bashunit/parallel/${_OS:-Unknown}"
+# Use a unique directory per run to avoid conflicts when bashunit is invoked
+# recursively or multiple instances are executed in parallel.
+TEMP_DIR_PARALLEL_TEST_SUITE="/tmp/bashunit/parallel/${_OS:-Unknown}/$(random_str 8)"
 TEMP_FILE_PARALLEL_STOP_ON_FAILURE="$TEMP_DIR_PARALLEL_TEST_SUITE/.stop-on-failure"
 TERMINAL_WIDTH="$(env::find_terminal_width)"
 FAILURES_OUTPUT_PATH=$(mktemp)