diff --git a/.github/workflows/mypy.yaml b/.github/workflows/mypy.yaml
new file mode 100644
index 0000000..d668490
--- /dev/null
+++ b/.github/workflows/mypy.yaml
@@ -0,0 +1,37 @@
+name: MYPY Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8, 3.9, '3.10']
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          version: 1.6.1
+
+      - name: Install Dependencies
+        run: poetry install --with dev
+
+      - name: Mypy Check
+        run: |
+          poetry run mypy --install-types
+          poetry run mypy excore/
diff --git a/tests/init.py b/tests/init.py
index cae9ede..eaca054 100644
--- a/tests/init.py
+++ b/tests/init.py
@@ -1,7 +1,10 @@
+import os
 import subprocess
 
 import toml
 
+import excore
+
 predefined_inputs = {
     "name": "tests",
     "src": "source_code",
@@ -41,6 +44,7 @@ def init():
         toml.dump(cfg, f)
     excute("excore update")
     excute("excore auto-register")
+    assert os.path.exists(os.path.join(excore.workspace.cache_base_dir, "tests"))
 
 
 if __name__ == "__main__":