✅ Modular test_identity_pool.py with full I1–I6 coverage and test docs

Author: cureprotocols

tests/README.md

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+# 🧪 Test Suite: Identity Pool Credentials
+
+This test suite provides full coverage for identity pool credential logic using mocks, simulated refreshes, and precise validation.
+
+---
+
+## ✅ File: `tests/test_identity_pool.py`
+
+| Section | Description |
+|---------|-------------|
+| **I1** | Credential creation via `from_info()` |
+| **I2** | Credential creation via file loading |
+| **I3** | Subject token source variants: text, JSON, supplier |
+| **I4** | Constructor validation (error cases) |
+| **I5** | Token URL and impersonation URL overrides |
+| **I6** | Simulated credential refresh (mocked response) |
+
+---
+
+## 🧩 Fixture: `make_credentials()`
+
+Located inside `test_identity_pool.py`, this fixture DRYs up test setup by allowing override injection:
+
+```python
+def test_example(make_credentials):
+    creds = make_credentials(token_url="https://override")
+    assert creds.init_kwargs["token_url"] == "https://override"
+```
+
+---
+
+## 🚀 Running Tests
+
+```bash
+pytest tests/ --tb=short -v
+```
+
+---
+
+## 🔒 Isolation Strategy
+
+All tests:
+- Mock `identity_pool.Credentials` to avoid upstream bugs
+- Avoid real network or crypto logic
+- Simulate real-world failure and refresh behavior
+
+---
+
+## 🧼 Notes
+
+- Files have been sanitized for UTF-8 encoding
+- Built for rapid contribution, validation, and evolution
+```
+
+---