chore(repo): migrate from jest to bun test runner (#757)

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: danadajian

.github/workflows/tests.yml

@@ -47,15 +47,15 @@ jobs:
         run: bun lint
 
       - name: Run Unit Tests
-        run: bun run test
+        run: bun test
 
       - name: Package
         run: bun package
 
       - name: Compare the expected and actual dist/ directories
         run: |
           if [[ $(git status --porcelain) ]]; then
-            echo "Detected uncommitted changes after build. Please run npm run package and commit the changes!"
+            echo "Detected uncommitted changes after build. Please run bun package and commit the changes!"
             git status
             git config user.name "${{ github.actor }}"
             git config user.email "${{ github.actor }}@users.noreply.github.com"

CONTRIBUTING.md

@@ -23,18 +23,18 @@ where "my-new-feature" describes what you're working on.
 This script will install all dependencies for local development.
 
 ```shell
-npm run setup
+bun setup
 ```
 
 ### 4. If you are creating a new helper
 
 ```shell
-npm run create-helper
+bun create-helper
 ```
 
 ### 5. Add tests for any bug fixes or new functionality
 
-All functions must be tested with a unit test. Please follow the existing convention of one exported function per file with a corresponding file to test it. Run tests using `npm run test`, or using the [Jest CLI](https://jestjs.io/docs/cli).
+All functions must be tested with a unit test. Please follow the existing convention of one exported function per file with a corresponding file to test it. Run tests using `bun test`.
 
 There are also integration tests present in the [workflow](./.github/workflows) directory, which will actually run each Github Action using the code from this repository. This allows you to test your changes right within the pull request you make.