CI: Run the tests on the CI.

.github/workflows/lint.yml

@@ -53,3 +53,51 @@ jobs:
       with:
         command: clippy
         args: --all-targets -- -D warnings
+
+  test:
+    name: ${{ matrix.name }}
+    needs: [clippy]
+
+    runs-on: ${{ matrix.os || 'ubuntu-latest' }}
+    strategy:
+      matrix:
+        name:
+          - linux / stable
+          - linux / beta
+          - macOS / stable
+          - windows / stable-x86_64-msvc
+
+        include:
+          - name: linux / stable
+
+          - name: linux / beta
+            rust: beta
+
+          - name: macOS / stable
+            os: macOS-latest
+
+          - name: windows / stable-x86_64-msvc
+            os: windows-latest
+            target: x86_64-pc-windows-msvc
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - name: Install rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust || 'stable' }}
+          target: ${{ matrix.target }}
+          profile: minimal
+          override: true
+
+      - name: Build
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+
+      - name: Test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test