feat: add github actions workflow for tests

.github/workflows/tests.yaml

@@ -0,0 +1,23 @@
+name: Tests
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: stable
+          targets: wasm32-unknown-unknown
+      - run: cargo test
+      - name: Install wasm-pack
+        run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+      - run: wasm-pack build --release --target nodejs --out-name index --out-dir out -- --no-default-features -F wasm
+      - uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: latest
+      - run: bun install
+      - run: bun node_modules/mocha/bin/mocha.js tests/test.js --bail --exit