Add generic Knative service contract

tests/test_contract.py

@@ -0,0 +1,23 @@
+from pathlib import Path
+import yaml
+
+ROOT = Path(__file__).parents[1]
+
+def service():
+    return yaml.safe_load((ROOT / "examples/service.yaml").read_text())
+
+def test_safe_generic_service():
+    item = service()
+    assert item["apiVersion"] == "serving.knative.dev/v1"
+    assert item["metadata"]["annotations"]["serving.knative.dev/visibility"] == "cluster-local"
+    template = item["spec"]["template"]
+    assert template["metadata"]["annotations"]["autoscaling.knative.dev/min-scale"] == "0"
+    assert int(template["metadata"]["annotations"]["autoscaling.knative.dev/max-scale"]) > 0
+    assert template["spec"]["containerConcurrency"] > 0
+    assert "@sha256:" in template["spec"]["containers"][0]["image"]
+    assert "qonto" not in (ROOT / "examples/service.yaml").read_text().lower()
+
+def test_traffic_is_deterministic():
+    traffic = service()["spec"]["traffic"]
+    assert len(traffic) == 1
+    assert sum(target["percent"] for target in traffic) == 100