feat(image-render): nano_banana (Gemini Flash Image) provider

services/image-render/tests/test_nano_banana.py

@@ -0,0 +1,25 @@
+import providers.nano_banana as nb
+
+def test_missing_key_reports_failed(monkeypatch):
+    monkeypatch.delenv("GEMINI_API_KEY", raising=False)
+    calls = []
+    monkeypatch.setattr(nb, "webhook_update_task", lambda *a, **k: calls.append((a, k)))
+    nb.run_nano_banana_generation("t1", {"prompt": "a cat"})
+    assert calls[-1][0][1] == "failed"
+
+def test_success_extracts_inline_data(monkeypatch):
+    monkeypatch.setenv("GEMINI_API_KEY", "g-test")
+    calls = []
+    monkeypatch.setattr(nb, "webhook_update_task", lambda *a, **k: calls.append((a, k)))
+    monkeypatch.setattr(nb, "save_b64_png", lambda tid, b64: "/media/image/t1.png")
+
+    class FakeResp:
+        status_code = 200
+        def json(self):
+            return {"candidates": [{"content": {"parts": [
+                {"inlineData": {"mimeType": "image/png", "data": "ZmFrZQ=="}}
+            ]}}]}
+    monkeypatch.setattr(nb.requests, "post", lambda *a, **k: FakeResp())
+
+    nb.run_nano_banana_generation("t1", {"prompt": "a cat"})
+    assert [c for c in calls if c[0][1] == "succeeded"]