broaden empty searches through resilient providers

tests/test_search_empty_query_relaxation.py

@@ -0,0 +1,62 @@
+from services.search import core
+
+
+def test_searxng_chain_always_keeps_distinct_private_engine_fallback(monkeypatch):
+    import services.search.providers as providers
+
+    monkeypatch.setattr(providers, 'provider_configured', lambda name: True)
+    monkeypatch.setattr(core, '_get_search_settings', lambda: {
+        'search_fallback_chain': ['duckduckgo'],
+    })
+
+    assert core._build_provider_chain('searxng') == [
+        'searxng', 'searxng_yep', 'duckduckgo',
+    ]
+
+
+def test_empty_document_search_relaxes_scaffolding_then_entity():
+    assert core._empty_result_query_relaxations(
+        'Find WIKING Miro 3 English manual official source online'
+    ) == [
+        'WIKING Miro 3 manual',
+        'WIKING Miro 3',
+    ]
+
+
+def test_search_uses_entity_relaxation_only_after_exact_queries_are_empty(
+    monkeypatch, tmp_path,
+):
+    calls = []
+
+    def provider(name, query, count, time_filter=None):
+        calls.append((name, query))
+        if name == 'searxng_yep' and query == 'WIKING Miro 3':
+            return [{
+                'title': 'WIKING Miro 3+ black with lower door - HWAM',
+                'url': 'https://www.hwam.com/miro3-side-glass-lower-door',
+                'snippet': 'Official WIKING Miro 3 product page.',
+            }]
+        return []
+
+    monkeypatch.setattr(core, 'SEARCH_CACHE_DIR', tmp_path)
+    monkeypatch.setattr(core, 'search_cache_index', {})
+    monkeypatch.setattr(core, '_get_search_settings', lambda: {
+        'search_provider': 'searxng',
+        'search_fallback_chain': ['duckduckgo'],
+    })
+    monkeypatch.setattr(core, '_build_provider_chain', lambda primary: [
+        'searxng', 'searxng_yep', 'duckduckgo',
+    ])
+    monkeypatch.setattr(core, '_call_provider', provider)
+    monkeypatch.setattr(core, '_record_query', lambda *args, **kwargs: None)
+    monkeypatch.setattr(core, 'cleanup_cache', lambda *args, **kwargs: None)
+
+    results = core.searxng_search_results(
+        'WIKING Miro 3 English manual official source', count=5,
+    )
+
+    assert results[0]['url'] == 'https://www.hwam.com/miro3-side-glass-lower-door'
+    assert ('searxng_yep', 'WIKING Miro 3') in calls
+    assert calls.index(('searxng_yep', 'WIKING Miro 3')) > calls.index(
+        ('searxng_yep', 'WIKING Miro 3 manual')
+    )