diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..01d21ff0c16f73340094995eea7ac86eb2452f39
--- /dev/null
+++ b/tests/__init__.py
@@ -0,0 +1 @@
+"""Initialise tests."""