diff --git a/quantecon/game_theory/tests/__init__.py b/quantecon/game_theory/tests/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/quantecon/markov/tests/__init__.py b/quantecon/markov/tests/__init__.py
new file mode 100644
index 000000000..e69de29bb