fix(reports): use mktemp for parallel-safe HTML report temp file

The fixed filename temp_test_cases.txt caused race conditions when
running tests in parallel mode, leading to "No such file or directory"
errors when multiple subprocesses accessed the same file.

Author: Chemaclass

release.sh

@@ -405,6 +405,7 @@ function release::sandbox::create() {
 function release::sandbox::setup_git() {
   cd "$SANDBOX_DIR"
   git init --quiet
+  git checkout -b main 2>/dev/null || true
   git config user.name "Release Sandbox"
   git config user.email "sandbox@local"
   git add .

src/reports.sh

@@ -118,8 +118,9 @@ function bashunit::reports::generate_report_html() {
   local tests_failed=$(bashunit::state::get_tests_failed)
   local time=$(bashunit::clock::total_runtime_in_milliseconds)
 
-  # Temporary file to store test cases by file
-  local temp_file="temp_test_cases.txt"
+  # Temporary file to store test cases by file (use mktemp for parallel safety)
+  local temp_file
+  temp_file=$(mktemp "${TMPDIR:-/tmp}/bashunit-report.XXXXXX")
 
   # Collect test cases by file
   : >"$temp_file" # Clear temp file if it exists

tests/unit/release_sandbox_test.sh

@@ -109,12 +109,7 @@ function test_sandbox_setup_git_creates_initial_commit() {
   # Should have at least one commit
   local commit_count
   commit_count=$(git -C "$SANDBOX_DIR" rev-list --count HEAD 2>/dev/null || echo "0")
-  # In minimal Docker environments, git commit may fail silently
-  if [ "$commit_count" = "0" ] && [ "${BASH_VERSINFO[0]}" -le 3 ]; then
-    bashunit::skip "git commit failed in Bash 3.x environment"
-  else
-    assert_equals "1" "$commit_count"
-  fi
+  assert_equals "1" "$commit_count"
 
   rm -rf "$SANDBOX_DIR"
   cd "$original_dir" || return