diff --git a/tests/test_schema.py b/tests/test_schema.py
new file mode 100644
index 0000000..4959063
--- /dev/null
+++ b/tests/test_schema.py
@@ -0,0 +1,97 @@
+import pytest
+from pydantic import ValidationError
+
+from spinner.schema import SpinnerMetadata
+
+# TEST: metadata -----------------------------------------------------------------------
+
+
+@pytest.fixture
+def metadata():
+    return {
+        "description": "Lorem ipsum dolor sit amet.",
+        "version": "1.0",
+        "runs": 2,
+        "timeout": 5,
+        "retry": True,
+        "retry_limit": 1,
+    }
+
+
+def test_metadata_valid(metadata):
+    """This test should always pass."""
+    SpinnerMetadata(**metadata)
+
+
+# TEST: metadata.version ---------------------------------------------------------------
+
+
+@pytest.fixture(params=["", "1", "1."])
+def metadata_invalid_version(metadata, request):
+    metadata["version"] = request.param
+    return metadata
+
+
+def test_metadata_version_invalid(metadata_invalid_version):
+    with pytest.raises(ValidationError) as _error:
+        SpinnerMetadata(**metadata_invalid_version)
+
+
+# TEST: metadata.runs ------------------------------------------------------------------
+
+
+@pytest.fixture(params=[0, -1])
+def metadata_invalid_runs(metadata, request):
+    metadata["runs"] = request.param
+    return metadata
+
+
+def test_metadata_runs_invalid(metadata_invalid_runs):
+    with pytest.raises(ValidationError) as _error:
+        SpinnerMetadata(**metadata_invalid_runs)
+
+
+# TEST: metadata.timeout ---------------------------------------------------------------
+
+
+@pytest.fixture(params=[0.0, -1.0])
+def metadata_invalid_timeout(metadata, request):
+    metadata["timeout"] = request.param
+    return metadata
+
+
+def test_metadata_timeout_none(metadata):
+    metadata["timeout"] = None
+    SpinnerMetadata(**metadata)
+
+
+def test_metadata_timeout_invalid(metadata_invalid_timeout):
+    with pytest.raises(ValidationError) as _error:
+        SpinnerMetadata(**metadata_invalid_timeout)
+
+
+# TEST: metadata.retry -----------------------------------------------------------------
+
+
+@pytest.fixture
+def metadata_no_retry(metadata):
+    metadata.pop("retry", None)
+    return metadata
+
+
+def test_metadata_retry_missing(metadata_no_retry):
+    SpinnerMetadata(**metadata_no_retry)
+
+
+# TEST: metadata.retry_limit -----------------------------------------------------------
+
+
+@pytest.fixture(params=[-1])
+def metadata_invalid_retry_limit(metadata, request):
+    metadata["retry_limit"] = request.param
+    return metadata
+
+
+def test_metadata_retry_limit_invalid(metadata_invalid_retry_limit):
+    with pytest.raises(ValidationError) as _error:
+        SpinnerMetadata(**metadata_invalid_retry_limit)