Test suite executed from CI pipeline (#433)

* Test strategy & test cases

* Unit tests

* Integration tests

tests/pytest.ini

@@ -0,0 +1,21 @@
+[pytest]
+testpaths = tests
+python_paths = .
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+addopts = 
+    -v
+    --tb=short
+    --strict-markers
+    --disable-warnings
+    --cov=trustgraph
+    --cov-report=html
+    --cov-report=term-missing
+#    --cov-fail-under=80
+asyncio_mode = auto
+markers =
+    slow: marks tests as slow (deselect with '-m "not slow"')
+    integration: marks tests as integration tests
+    unit: marks tests as unit tests
+    vertexai: marks tests as vertex ai specific tests