diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..d055d41
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,22 @@
+name: tests
+
+on: pull_request
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install gnome-keyring
+        run: sudo apt-get install gnome-keyring
+
+      - name: Install poetry
+        run: pip install --user poetry
+
+      - name: Install dependencies
+        run: poetry install --no-root
+
+      - name: Run tests
+        run: poetry run python -m unittest discover --verbose
diff --git a/simtfl/bc/__init__.py b/simtfl/bc/__init__.py
index f17dc7c..5d70066 100644
--- a/simtfl/bc/__init__.py
+++ b/simtfl/bc/__init__.py
@@ -96,3 +96,21 @@ class BCProtocol:
     Transaction: type[object] = BCTransaction
     Context: type[object] = BCContext
     Block: type[object] = BCBlock
+
+
+import unittest
+
+class TestBC(unittest.TestCase):
+    def test_basic(self):
+        ctx = BCContext()
+        issuance_tx0 = BCTransaction([], [10], 0, issuance=10)
+        assert ctx.add_if_valid(issuance_tx0)
+        genesis = BCBlock(None, 1, [issuance_tx0])
+        assert genesis.score == 1
+
+        issuance_tx1 = BCTransaction([], [6], -1, issuance=5)
+        spend_tx = BCTransaction([issuance_tx0.output(0)], [9], 1)
+        assert ctx.add_if_valid(issuance_tx1)
+        assert ctx.add_if_valid(spend_tx)
+        block1 = BCBlock(genesis, 1, [issuance_tx1, spend_tx])
+        assert block1.score == 2