chore: expose codex_home via Config (#941)

codex-rs/core/tests/test_support.rs

@@ -0,0 +1,23 @@
+#![allow(clippy::expect_used)]
+
+// Helpers shared by the integration tests.  These are located inside the
+// `tests/` tree on purpose so they never become part of the public API surface
+// of the `codex-core` crate.
+
+use tempfile::TempDir;
+
+use codex_core::config::Config;
+use codex_core::config::ConfigOverrides;
+use codex_core::config::ConfigToml;
+
+/// Returns a default `Config` whose on-disk state is confined to the provided
+/// temporary directory. Using a per-test directory keeps tests hermetic and
+/// avoids clobbering a developer’s real `~/.codex`.
+pub fn load_default_config_for_test(codex_home: &TempDir) -> Config {
+    Config::load_from_base_config_with_overrides(
+        ConfigToml::default(),
+        ConfigOverrides::default(),
+        codex_home.path().to_path_buf(),
+    )
+    .expect("defaults for test should always succeed")
+}