refactor(runner): extract test identity and title interpolation

Pull the test ID/coverage env exports and the data-provider title
interpolation block out of `bashunit::runner::run_test` into named
helpers (`export_test_identity`, `apply_interpolated_title`). The
helper returns the interpolated name so subsequent code in `run_test`
keeps the same local. Pure extraction, no behavior change.

Author: Chemaclass

CHANGELOG.md

@@ -12,6 +12,7 @@
 - Guard root `package.json` against accidental regression of the docs-split: assert no `dependencies`/`devDependencies`/`peerDependencies`/`scripts` blocks ever return to the published manifest
 - `release.sh` now treats `docs/package.json` as a first-class `RELEASE_FILES` entry, so the release flow backs it up, restores it on rollback, and stages it without inline duplication. Backup/restore preserves nested directory paths
 - Extract `bashunit::runner::source_login_shell_profiles` and `bashunit::runner::print_verbose_test_summary` from the 320-line `run_test` body so the hot path reads top-down without inline `~/.profile` sourcing or printf scaffolding
+- Further trim `bashunit::runner::run_test`: extract `export_test_identity` (test ID + coverage env exports) and `apply_interpolated_title` (data-provider title interpolation) so the function opens with five named one-liners instead of an inline export/branch block
 - Centralize all ANSI escape emission through the existing `_BASHUNIT_COLOR_*` constants. `src/coverage.sh` and the `--watch` screen-clear in `src/main.sh` no longer hardcode escape sequences (#247)
 - Speed up coverage report generation by collapsing the per-line non-executable pattern checks in `bashunit::coverage::is_executable_line` into a single combined `grep` invocation (#636)
 - Speed up coverage report generation further by combining executable + hit counting into a single source-file pass (`bashunit::coverage::compute_file_coverage`) shared across text/lcov/html reporters, removing per-line `get_line_hits` scans of the coverage data file (#636)

src/runner.sh

@@ -23,6 +23,29 @@ function bashunit::runner::source_login_shell_profiles() {
   [ -f ~/.profile ] && source ~/.profile 2>/dev/null || true
 }
 
+function bashunit::runner::export_test_identity() {
+  local test_file=$1
+  local fn_name=$2
+  export BASHUNIT_CURRENT_TEST_ID="$(bashunit::helper::generate_id "$fn_name")"
+  if bashunit::env::is_coverage_enabled; then
+    export _BASHUNIT_COVERAGE_CURRENT_TEST_FILE="$test_file"
+    export _BASHUNIT_COVERAGE_CURRENT_TEST_FN="$fn_name"
+  fi
+}
+
+function bashunit::runner::apply_interpolated_title() {
+  local fn_name=$1
+  shift
+  local interpolated
+  interpolated="$(bashunit::helper::interpolate_function_name "$fn_name" "$@")"
+  if [ "$interpolated" != "$fn_name" ]; then
+    bashunit::state::set_current_test_interpolated_function_name "$interpolated"
+  else
+    bashunit::state::reset_current_test_interpolated_function_name
+  fi
+  printf '%s' "$interpolated"
+}
+
 function bashunit::runner::print_verbose_test_summary() {
   local test_file=$1
   local fn_name=$2
@@ -620,24 +643,11 @@ function bashunit::runner::run_test() {
   shift
 
   bashunit::internal_log "Running test" "$fn_name" "$*"
-  # Export a unique test identifier so that test doubles can
-  # create temporary files scoped per test run. This prevents
-  # race conditions when running tests in parallel.
-  export BASHUNIT_CURRENT_TEST_ID="$(bashunit::helper::generate_id "$fn_name")"
-  # Export current test file and function for coverage tracking (only when coverage enabled)
-  if bashunit::env::is_coverage_enabled; then
-    export _BASHUNIT_COVERAGE_CURRENT_TEST_FILE="$test_file"
-    export _BASHUNIT_COVERAGE_CURRENT_TEST_FN="$fn_name"
-  fi
+  bashunit::runner::export_test_identity "$test_file" "$fn_name"
 
   bashunit::state::reset_test_title
-
-  local interpolated_fn_name="$(bashunit::helper::interpolate_function_name "$fn_name" "$@")"
-  if [ "$interpolated_fn_name" != "$fn_name" ]; then
-    bashunit::state::set_current_test_interpolated_function_name "$interpolated_fn_name"
-  else
-    bashunit::state::reset_current_test_interpolated_function_name
-  fi
+  local interpolated_fn_name
+  interpolated_fn_name=$(bashunit::runner::apply_interpolated_title "$fn_name" "$@")
   local current_assertions_failed="$_BASHUNIT_ASSERTIONS_FAILED"
   local current_assertions_snapshot="$_BASHUNIT_ASSERTIONS_SNAPSHOT"
   local current_assertions_incomplete="$_BASHUNIT_ASSERTIONS_INCOMPLETE"