test(api): yoga list keeps all twelve rows; empty module list is not replaced by a preview (BUG-1186)

Regression tests for 96767418 (TASK-upstream-sync4-20261002 T4). Both methods
are called unbound; no JyotishAPIHandler is forged.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE

tests/test_api_yoga_list_presence.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+"""BUG-1186 (TASK-upstream-sync4-20261002 T4): the API yoga list is not cut to
+ten, and an evaluated empty yoga module is not replaced by a chart preview.
+
+Both methods read no handler state, so they are called unbound; no
+``JyotishAPIHandler`` instance is forged (growth contract).
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+import types
+
+SCRIPTS = os.path.join(os.path.dirname(__file__), '..', 'scripts')
+if SCRIPTS not in sys.path:
+    sys.path.insert(0, SCRIPTS)
+
+from jyotish_api_server import JyotishAPIHandler  # noqa: E402
+
+
+def _install(monkeypatch, name: str, **attrs) -> None:
+    module = types.ModuleType(name)
+    for key, value in attrs.items():
+        setattr(module, key, value)
+    monkeypatch.setitem(sys.modules, name, module)
+
+
+def test_detect_yogas_returns_all_twelve(monkeypatch) -> None:
+    rows = [{'name': f'Yoga {i}', 'planets': ['Jupiter']} for i in range(12)]
+    _install(monkeypatch, 'pancha_mahapurusha', detect_pancha_mahapurusha=lambda planets: [])
+    _install(monkeypatch, 'yoga_expansion', detect_all_yogas=lambda planets, asc: rows)
+
+    result = JyotishAPIHandler._detect_yogas(None, {}, 0)
+
+    # 原值: yogas[:10]，第 11、12 条被丢；新值: 12 条全部返回
+    assert [row['name'] for row in result] == [f'Yoga {i}' for i in range(12)]
+
+
+def _reading(yoga_module, chart_yogas):
+    return {
+        'chart': {'planets': {'Sun': {}}, 'ascendant': 'Aries', 'yogas': chart_yogas},
+        'modules': {'yoga': yoga_module},
+    }
+
+
+def test_evaluated_empty_module_list_is_not_replaced_by_chart_preview() -> None:
+    preview = [{'name': 'Stale preview yoga'}]
+    normalized = JyotishAPIHandler._chart_from_full_reading(None, _reading({'yogas': []}, preview))
+    assert normalized['yogas'] == []
+
+
+def test_module_list_precedes_chart_preview_and_detected_yogas_is_second() -> None:
+    module_rows = [{'name': f'M{i}'} for i in range(12)]
+    preview = [{'name': 'Stale preview yoga'}]
+    normalized = JyotishAPIHandler._chart_from_full_reading(None, _reading({'yogas': module_rows}, preview))
+    assert normalized['yogas'] == module_rows
+
+    detected = [{'name': 'Detected'}]
+    normalized = JyotishAPIHandler._chart_from_full_reading(None, _reading({'detected_yogas': detected}, preview))
+    assert normalized['yogas'] == detected
+
+    normalized = JyotishAPIHandler._chart_from_full_reading(None, _reading({}, preview))
+    assert normalized['yogas'] == preview