diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..0d20b648
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.pyc
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 00000000..920cbb5e
--- /dev/null
+++ b/tests/__init__.py
@@ -0,0 +1,15 @@
+# coding=utf-8
+# Copyright 2018 The Dopamine Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
diff --git a/tests/dopamine/__init__.py b/tests/dopamine/__init__.py
new file mode 100644
index 00000000..920cbb5e
--- /dev/null
+++ b/tests/dopamine/__init__.py
@@ -0,0 +1,15 @@
+# coding=utf-8
+# Copyright 2018 The Dopamine Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
diff --git a/tests/dopamine/agents/__init__.py b/tests/dopamine/agents/__init__.py
new file mode 100644
index 00000000..920cbb5e
--- /dev/null
+++ b/tests/dopamine/agents/__init__.py
@@ -0,0 +1,15 @@
+# coding=utf-8
+# Copyright 2018 The Dopamine Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
diff --git a/tests/dopamine/agents/rainbow/__init__.py b/tests/dopamine/agents/rainbow/__init__.py
new file mode 100644
index 00000000..920cbb5e
--- /dev/null
+++ b/tests/dopamine/agents/rainbow/__init__.py
@@ -0,0 +1,15 @@
+# coding=utf-8
+# Copyright 2018 The Dopamine Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+