run unit tests on CI

.github/workflows/ci.yml

@@ -2,6 +2,19 @@ name: CI
 on: [push, pull_request]
 
 jobs:
+  unit-test:
+    runs-on: ubuntu-latest
+    env:
+      CARGO_TERM_COLOR: always
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: Swatinem/rust-cache@v1
+      - run: cargo test -- --skip src/lib.rs
   lint:
     runs-on: ubuntu-latest
     env: