diff --git a/src/ml_things/__init__.py b/src/ml_things/__init__.py
index afa413d..ebcde5d 100644
--- a/src/ml_things/__init__.py
+++ b/src/ml_things/__init__.py
@@ -1,6 +1,17 @@
-# flake8: noqa
 # coding=utf-8
 # Copyright 2020 George Mihaila.
+#
+# 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.
 
 __version__ = "0.0.1"
 
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..f719599
--- /dev/null
+++ b/tests/__init__.py
@@ -0,0 +1,14 @@
+# coding=utf-8
+# Copyright 2020 George Mihaila.
+#
+# 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/test_array_functions.py b/tests/test_array_functions.py
new file mode 100644
index 0000000..f3e29ba
--- /dev/null
+++ b/tests/test_array_functions.py
@@ -0,0 +1,46 @@
+# coding=utf-8
+# Copyright 2020 George Mihaila.
+#
+# 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.
+"""
+Unittesting array related functions.
+
+Run: python -m unittest test_array_functions
+
+"""
+
+import unittest
+from ml_things import (
+                       batch_array,
+                       pad_array,
+                      )
+
+
+class TestPadArray(unittest.TestCase):
+    def test_type(self):
+        # Make sure type errors are raised when necessary
+        pass
+
+    def test_pad_array(self):
+        # Test a sample of pad_array.
+        pass
+
+
+class TestBatchArray(unittest.TestCase):
+    def test_type(self):
+        # Make sure type errors are raised when necessary
+        pass
+
+    def test_batch_array(self):
+        # Test a sample of batch_array.
+        pass
diff --git a/tests/test_plot_functions.py b/tests/test_plot_functions.py
new file mode 100644
index 0000000..910b3ed
--- /dev/null
+++ b/tests/test_plot_functions.py
@@ -0,0 +1,22 @@
+# coding=utf-8
+# Copyright 2020 George Mihaila.
+#
+# 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.
+"""
+Unittesting plot functions.
+
+Run: python -m unittest test_plot_funcitons
+
+"""
+
+# Work in progress
diff --git a/tests/test_samples/plot_array.png b/tests/test_samples/plot_array.png
new file mode 100644
index 0000000..5b85552
Binary files /dev/null and b/tests/test_samples/plot_array.png differ
diff --git a/tests/test_samples/plot_confusion_matrix.png b/tests/test_samples/plot_confusion_matrix.png
new file mode 100644
index 0000000..34a570c
Binary files /dev/null and b/tests/test_samples/plot_confusion_matrix.png differ
diff --git a/tests/test_samples/plot_dict.png b/tests/test_samples/plot_dict.png
new file mode 100644
index 0000000..d96a714
Binary files /dev/null and b/tests/test_samples/plot_dict.png differ
diff --git a/tests/test_text_functions.py b/tests/test_text_functions.py
new file mode 100644
index 0000000..02d2d88
--- /dev/null
+++ b/tests/test_text_functions.py
@@ -0,0 +1,22 @@
+# coding=utf-8
+# Copyright 2020 George Mihaila.
+#
+# 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.
+"""
+Unittesting text related functions.
+
+Run: python -m unittest test_text_functions
+
+"""
+
+# Work in progress
diff --git a/tests/test_web_related.py b/tests/test_web_related.py
new file mode 100644
index 0000000..c20c295
--- /dev/null
+++ b/tests/test_web_related.py
@@ -0,0 +1,22 @@
+# coding=utf-8
+# Copyright 2020 George Mihaila.
+#
+# 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.
+"""
+Unittesting web realted functions.
+
+Run: python -m unittest test_web_related
+
+"""
+
+# Work in progress