Initial Pytests for ollama.py.

tests/unit/llms/test_llm_ollama.py

+import pytest
+from semantic_router.llms.ollama import OllamaLLM
+from semantic_router.schema import Message
+
+@pytest.fixture
+def ollama_llm():
+    return OllamaLLM()
+
+class TestOllamaLLM:
+    def test_ollama_llm_init_success(self, ollama_llm):
+        assert ollama_llm.name == "ollama"
+        assert ollama_llm.temperature == 0.2
+        assert ollama_llm.llm_name == "openhermes"
+        assert ollama_llm.max_tokens == 200
+        assert ollama_llm.stream is False
+
+    def test_ollama_llm_call_success(self, ollama_llm, mocker):
+        mock_response = mocker.MagicMock()
+        mock_response.json.return_value = {"message": {"content": "test response"}}
+        mocker.patch('requests.post', return_value=mock_response)
+        
+        output = ollama_llm([Message(role="user", content="test")])
+        assert output == "test response"
+
+    def test_ollama_llm_error_handling(self, ollama_llm, mocker):
+        mocker.patch('requests.post', side_effect=Exception("LLM error"))
+        with pytest.raises(Exception) as exc_info:
+            ollama_llm([Message(role="user", content="test")])
+        assert "LLM error" in str(exc_info.value)
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