Add pytest config and example test

Tests can be run with the `pytest` command from the repository's
root directory.

Signed-off-by: Kaushik Varadharajan <kaushik.varadharajan@arm.com>
Change-Id: Id1ead34da927d4455964cb211e4fc0c6294e4bdf
diff --git a/pyproject.toml b/pyproject.toml
index 6cfb8f6..eb95ed9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,3 +41,8 @@
 
 [tool.setuptools_scm]
 version_scheme = "no-guess-dev"
+
+[tool.pytest.ini_options]
+testpaths = ["python/pytests"]
+addopts = ["-vv"]
+filterwarnings = ["ignore::DeprecationWarning"]