fix(tests): isolate tests from user ~/.hermes/ config and SOUL.md

_make_cli() now patches CLI_CONFIG with clean defaults so
test_cli_init tests don't depend on the developer's local config.yaml.
test_empty_dir_returns_empty now mocks Path.home() so it doesn't pick
up a global SOUL.md.

Credit to teyrebaz33 for identifying and fixing these in PR #557.
Fixes #555.

tests/agent/test_prompt_builder.py

@@ -172,7 +172,11 @@ class TestBuildSkillsSystemPrompt:
 
 class TestBuildContextFilesPrompt:
     def test_empty_dir_returns_empty(self, tmp_path):
-        result = build_context_files_prompt(cwd=str(tmp_path))
+        from unittest.mock import patch
+        fake_home = tmp_path / "fake_home"
+        fake_home.mkdir()
+        with patch("pathlib.Path.home", return_value=fake_home):
+            result = build_context_files_prompt(cwd=str(tmp_path))
         assert result == ""
 
     def test_loads_agents_md(self, tmp_path):

tests/test_cli_init.py

@@ -12,8 +12,21 @@ sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
 
 def _make_cli(**kwargs):
     """Create a HermesCLI instance with minimal mocking."""
+    import cli as _cli_mod
     from cli import HermesCLI
-    with patch("cli.get_tool_definitions", return_value=[]):
+    _clean_config = {
+        "model": {
+            "default": "anthropic/claude-opus-4.6",
+            "base_url": "https://openrouter.ai/api/v1",
+            "provider": "auto",
+        },
+        "display": {"compact": False, "tool_progress": "all"},
+        "agent": {},
+        "terminal": {"env_type": "local"},
+    }
+    with patch("cli.get_tool_definitions", return_value=[]), \
+         patch.dict("os.environ", {"LLM_MODEL": ""}, clear=False), \
+         patch.dict(_cli_mod.__dict__, {"CLI_CONFIG": _clean_config}):
         return HermesCLI(**kwargs)