Add test for generating text with different providers

tests/test_generate_text.py

@@ -0,0 +1,23 @@
+import pytest
+
+from simplemind.providers import Anthropic, Gemini, OpenAI, Groq, Ollama
+
+
+@pytest.mark.parametrize(
+    "provider_cls",
+    [
+        Anthropic,
+        Gemini,
+        OpenAI,
+        Groq,
+        Ollama,
+    ],
+)
+def test_generate_text(provider_cls):
+    provider = provider_cls()
+    prompt = "What is 2+2?"
+
+    response = provider.generate_text(prompt=prompt, llm_model=provider.DEFAULT_MODEL)
+
+    assert isinstance(response, str)
+    assert len(response) > 0