support/testing: add python-pyyaml tests

Add a simple test case to check the basic usage, storing a dict into a
file and then retrieving the dict from the file.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/sample_python_pyyaml_dec.py

@@ -0,0 +1,10 @@
+import yaml
+
+with open("/tmp/data.yml", "rb") as f:
+    serialized = f.read()
+data = yaml.load(serialized)
+print(data)
+assert(data["name"] == "python-pyyaml")
+assert(data["versions"] == ["1", "2"])
+assert(data["group"]["is_a_package"] is True)
+assert(data["group"]["value"] == 42)