diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..fcbdef1
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,11 @@
+import pytest
+
+
+@pytest.fixture(scope="session", autouse=True)
+def never_sleep():
+    """Make `time.sleep()` calls no-ops."""
+
+    session_patcher = pytest.MonkeyPatch()
+    with session_patcher.context() as patcher:
+        patcher.setattr("time.sleep", lambda _: None)
+        yield