Fix testing to be source path agnostic

[Zordrak]

No description provided.

[Copilot]

Pull Request Overview

This PR centralizes test setup into a shared test_common.sh, removes duplicated boilerplate from individual test scripts, and makes test paths agnostic by introducing temporary directories and using TFENV_CONFIG_DIR in cleanup and directory checks.

• Added test_common.sh to consolidate TFENV_ROOT determination, helpers sourcing, and PATH setup
• Updated individual tests to source test_common.sh and replaced hard-coded paths with TFENV_CONFIG_DIR or temporary directories
• Enhanced cleanup() in lib/helpers.sh to verify TFENV_CONFIG_DIR before removing test artifacts

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/test_use_minrequired.sh	Removed inline TFENV_ROOT boilerplate, now sources test_common.sh
test/test_use_latestallowed.sh	Same boilerplate removal and common setup sourcing
test/test_uninstall.sh	Sourced common setup and switched version-dir checks to use TFENV_CONFIG_DIR
test/test_symlink.sh	Sourced common setup; replaced fixed /tmp path with mktemp -d and added trap for cleanup
test/test_list.sh	Removed inline setup and sources test_common.sh
test/test_install_and_use.sh	Boilerplate removed, now sources common setup
test/test_common.sh	New shared setup file for TFENV_ROOT, helpers, and PATH
test/run.sh	Refactored to source test_common.sh
lib/helpers.sh	Updated cleanup() to check for TFENV_CONFIG_DIR and delete from that directory

Comments suppressed due to low confidence (2)

test/test_uninstall.sh:56

• TFENV_CONFIG_DIR is referenced here but never initialized in test_common.sh, causing this check to always fail. Consider defining and exporting TFENV_CONFIG_DIR in test_common.sh to point to an isolated config directory for tests.

  [ -d "${TFENV_CONFIG_DIR}/versions" ] || exit 1

test/test_common.sh:3

• Tests and the cleanup routine rely on TFENV_CONFIG_DIR but it isn't set here. Add an initialization, e.g.: export TFENV_CONFIG_DIR="$(mktemp -d)"; trap 'rm -rf "${TFENV_CONFIG_DIR}"' EXIT.

# Common test setup header