Stub in an initial OpenAI Responses API

Signed-off-by: Ben Browning <bbrownin@redhat.com>

tests/integration/test_cases/openai/responses.json

@@ -0,0 +1,26 @@
+{
+  "non_streaming_01": {
+    "data": {
+      "question": "Which planet do humans live on?",
+      "expected": "Earth"
+    }
+  },
+  "non_streaming_02": {
+    "data": {
+      "question": "Which planet has rings around it with a name starting with letter S?",
+      "expected": "Saturn"
+    }
+  },
+  "streaming_01": {
+    "data": {
+      "question": "What's the name of the Sun in latin?",
+      "expected": "Sol"
+    }
+  },
+  "streaming_02": {
+    "data": {
+      "question": "What is the name of the US captial?",
+      "expected": "Washington"
+    }
+  }
+}

tests/integration/test_cases/test_case.py

@@ -12,6 +12,7 @@ class TestCase:
     _apis = [
         "inference/chat_completion",
         "inference/completion",
+        "openai/responses",
     ]
     _jsonblob = {}