Add tests for LlmSession and LlmSessionCaptionsAndKeywords in both integration and mocked scenarios (#12)

Reviewed-on: #12
Co-authored-by: Mathias Scheider <mathias2784@web.de>

test/test_llm_session_integration.py

@@ -7,7 +7,21 @@ from photools3.llm_session import LlmSession
     not LlmSession(system_prompt="").is_api_reachable(), reason="API not available"
 )
 def test_llm_session(llm_session, test_photo):
+    llm_session.system_prompt = "Return only JSON format: {'keywords': ['...']}"
     result = llm_session.call(
         prompt="keywords for the attached picture", photos=[test_photo]
     )
-    assert result
+    assert result is not None
+
+
+@pytest.mark.skipif(
+    not LlmSession(system_prompt="").is_api_reachable(), reason="API not available"
+)
+def test_llm_session_captions_and_keywords(
+    llm_session_captions_and_keywords, test_photo
+):
+    result = llm_session_captions_and_keywords.call(photos=[test_photo])
+    assert "caption" in result
+    assert "tags" in result
+    assert isinstance(result["caption"], str)
+    assert isinstance(result["tags"], list)