feat(deepseek): Implement Phase 1 infrastructure and provider interface

tests/test_deepseek_infra.py

@@ -0,0 +1,51 @@
+import pytest
+import os
+import tomllib
+import tomli_w
+from pathlib import Path
+import sys
+
+# Ensure project root is in path
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+
+import ai_client
+import project_manager
+
+def test_credentials_error_mentions_deepseek(monkeypatch):
+    """
+    Verify that the error message shown when credentials.toml is missing
+    includes deepseek instructions.
+    """
+    # Monkeypatch SLOP_CREDENTIALS to a non-existent file
+    monkeypatch.setenv("SLOP_CREDENTIALS", "non_existent_credentials_file.toml")
+    
+    with pytest.raises(FileNotFoundError) as excinfo:
+        ai_client._load_credentials()
+    
+    err_msg = str(excinfo.value)
+    assert "[deepseek]" in err_msg
+    assert "api_key" in err_msg
+
+def test_default_project_includes_reasoning_role():
+    """
+    Verify that 'Reasoning' is included in the default discussion roles
+    to support DeepSeek-R1 reasoning traces.
+    """
+    proj = project_manager.default_project("test")
+    roles = proj["discussion"]["roles"]
+    assert "Reasoning" in roles
+
+def test_gui_providers_list():
+    """
+    Check if 'deepseek' is in the GUI's provider list.
+    """
+    import gui_2
+    assert "deepseek" in gui_2.PROVIDERS
+
+def test_deepseek_model_listing():
+    """
+    Verify that list_models for deepseek returns expected models.
+    """
+    models = ai_client.list_models("deepseek")
+    assert "deepseek-chat" in models
+    assert "deepseek-reasoner" in models