Add wasm testing workflow

Author: 197g

.github/workflows/rust.yml

@@ -70,3 +70,29 @@ jobs:
         env:
           FEATURES: ${{ matrix.features }}
           CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER: aarch64-linux-gnu-gcc
+  cross_compile_wasm:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install node
+        run: |
+          sudo apt-get update
+          sudo apt-get install nodejs
+          node -v
+      - name: Install wasm-bindgen
+        run: >
+          curl -L "$WASMBINDGEN_UPSTREAM"
+          | tar xzf - --strip-components=1 wasm-bindgen-0.2.80-x86_64-unknown-linux-musl/wasm-bindgen-test-runner
+          && sudo mv wasm-bindgen-test-runner /usr/bin/wasm-bindgen-test-runner
+        env:
+          WASMBINDGEN_UPSTREAM: https://github.com/rustwasm/wasm-bindgen/releases/download/0.2.80/wasm-bindgen-0.2.80-x86_64-unknown-linux-musl.tar.gz
+      - name: Installing Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          override: true
+          toolchain: stable
+          target: wasm32-unknown-unknown
+      - uses: actions/checkout@v2
+      - name: Test
+        run: cargo test -vv --target wasm32-unknown-unknown
+        env:
+          CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER: wasm-bindgen-test-runner