diff --git a/.github/workflows/checker.yml b/.github/workflows/checker.yml
new file mode 100644
index 0000000..ba5c873
--- /dev/null
+++ b/.github/workflows/checker.yml
@@ -0,0 +1,21 @@
+name: checker
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: cache deps
+        uses: actions/cache@v2
+        with:
+          path: "**/node_modules"
+          key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}
+
+      - name: yarn install
+        run: yarn install
+
+      - name: yarn test
+        run: yarn test
diff --git a/.gitignore b/.gitignore
index 9220cd2..fbf5692 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,7 @@ dist
 packages/**/dist
 
 # NPM
-package-lock.json
\ No newline at end of file
+package-lock.json
+
+# yarn
+yarn-error.log