fix: missing licenses

Author: gpongelli

tests/conftest.py

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
+# SPDX-FileCopyrightText: Copyright (c) 2022 Gabriele Pongelli
+#
+# SPDX-License-Identifier: MIT
+
 import pytest
 
 

tests/test_pca9534.py

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
+# SPDX-FileCopyrightText: Copyright (c) 2022 Gabriele Pongelli
+#
+# SPDX-License-Identifier: MIT
+
 from busio import I2C
 
 import gpio_expander

tests/test_pca9535.py

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
+# SPDX-FileCopyrightText: Copyright (c) 2022 Gabriele Pongelli
+#
+# SPDX-License-Identifier: MIT
+
 from busio import I2C
 
 import gpio_expander

tests/test_pca9555.py

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
+# SPDX-FileCopyrightText: Copyright (c) 2022 Gabriele Pongelli
+#
+# SPDX-License-Identifier: MIT
+
 from busio import I2C
 
 import gpio_expander

tests/test_tca9534.py

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
+# SPDX-FileCopyrightText: Copyright (c) 2022 Gabriele Pongelli
+#
+# SPDX-License-Identifier: MIT
+
 from busio import I2C
 
 import gpio_expander

tests/test_tca9535.py

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
+# SPDX-FileCopyrightText: Copyright (c) 2022 Gabriele Pongelli
+#
+# SPDX-License-Identifier: MIT
+
 from busio import I2C
 
 import gpio_expander

tests/test_tca9555.py

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
+# SPDX-FileCopyrightText: Copyright (c) 2022 Gabriele Pongelli
+#
+# SPDX-License-Identifier: MIT
+
 from busio import I2C
 
 import gpio_expander