[Feature] Add support for Mistral API (#1194)

Co-authored-by: Deven Patel <deven298@yahoo.com>

tests/llm/test_mistralai.py

@@ -0,0 +1,60 @@
+import pytest
+
+from embedchain.config import BaseLlmConfig
+from embedchain.llm.mistralai import MistralAILlm
+
+
+@pytest.fixture
+def mistralai_llm_config(monkeypatch):
+    monkeypatch.setenv("MISTRAL_API_KEY", "fake_api_key")
+    yield BaseLlmConfig(model="mistral-tiny", max_tokens=100, temperature=0.7, top_p=0.5, stream=False)
+    monkeypatch.delenv("MISTRAL_API_KEY", raising=False)
+
+
+def test_mistralai_llm_init_missing_api_key(monkeypatch):
+    monkeypatch.delenv("MISTRAL_API_KEY", raising=False)
+    with pytest.raises(ValueError, match="Please set the MISTRAL_API_KEY environment variable."):
+        MistralAILlm()
+
+
+def test_mistralai_llm_init(monkeypatch):
+    monkeypatch.setenv("MISTRAL_API_KEY", "fake_api_key")
+    llm = MistralAILlm()
+    assert llm is not None
+
+
+def test_get_llm_model_answer(monkeypatch, mistralai_llm_config):
+    def mock_get_answer(prompt, config):
+        return "Generated Text"
+
+    monkeypatch.setattr(MistralAILlm, "_get_answer", mock_get_answer)
+    llm = MistralAILlm(config=mistralai_llm_config)
+    result = llm.get_llm_model_answer("test prompt")
+
+    assert result == "Generated Text"
+
+
+def test_get_llm_model_answer_with_system_prompt(monkeypatch, mistralai_llm_config):
+    mistralai_llm_config.system_prompt = "Test system prompt"
+    monkeypatch.setattr(MistralAILlm, "_get_answer", lambda prompt, config: "Generated Text")
+    llm = MistralAILlm(config=mistralai_llm_config)
+    result = llm.get_llm_model_answer("test prompt")
+
+    assert result == "Generated Text"
+
+
+def test_get_llm_model_answer_empty_prompt(monkeypatch, mistralai_llm_config):
+    monkeypatch.setattr(MistralAILlm, "_get_answer", lambda prompt, config: "Generated Text")
+    llm = MistralAILlm(config=mistralai_llm_config)
+    result = llm.get_llm_model_answer("")
+
+    assert result == "Generated Text"
+
+
+def test_get_llm_model_answer_without_system_prompt(monkeypatch, mistralai_llm_config):
+    mistralai_llm_config.system_prompt = None
+    monkeypatch.setattr(MistralAILlm, "_get_answer", lambda prompt, config: "Generated Text")
+    llm = MistralAILlm(config=mistralai_llm_config)
+    result = llm.get_llm_model_answer("test prompt")
+
+    assert result == "Generated Text"