diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 54500c4..5e1dfeb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -57,3 +57,27 @@ jobs:
       run: |
         cargo run --package gen -- --bin target/debug/imdl book
         mdbook build book --dest-dir ../www/book
+
+  test:
+    strategy:
+      matrix:
+        os:
+        - macos-latest
+        - ubuntu-latest
+        - windows-latest
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Install Rust Toolchain Components
+      uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: stable
+
+    - uses: Swatinem/rust-cache@v2
+
+    - name: Test
+      run: cargo test --workspace