Add Vitest testing setup and Button component tests (#11)

* Add Vitest testing setup and Button component tests

- Install Vitest and related dependencies
- Configure Vitest with React support
- Create Button component test cases
- Add test scripts to package.json
- Create TESTING.md documentation
- Update test comments to English for consistency

* Update package.json

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Bertrand Yuan <yuanweijie1456@outlook.com>

* Update package.json

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Bertrand Yuan <yuanweijie1456@outlook.com>

* remove TESTING.md for the moment

There are many parts not matched with current content.

Signed-off-by: Bertrand Yuan <me@bertyuan.com>

---------

Signed-off-by: Bertrand Yuan <yuanweijie1456@outlook.com>
Signed-off-by: Bertrand Yuan <me@bertyuan.com>
Co-authored-by: Bertrand Yuan <me@bertyuan.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Bertrand Yuan <bert.yuan@outlook.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/test/setup.ts b/src/test/setup.ts
new file mode 100644
index 0000000..bb02c60
--- /dev/null
+++ b/src/test/setup.ts
@@ -0,0 +1 @@
+import '@testing-library/jest-dom/vitest';