forked from Zakaria/hermes-agent
Hermes-agent
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Zakaria
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"""Tests for the bundled OpenAI image_gen plugin (gpt-image-2, three tiers)."""
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from __future__ import annotations
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from pathlib import Path
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from types import SimpleNamespace
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from unittest.mock import MagicMock, patch
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import pytest
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import plugins.image_gen.openai as openai_plugin
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# 1×1 transparent PNG — valid bytes for save_b64_image()
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_PNG_HEX = (
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"89504e470d0a1a0a0000000d49484452000000010000000108060000001f15c4"
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"890000000d49444154789c6300010000000500010d0a2db40000000049454e44"
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"ae426082"
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)
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def _b64_png() -> str:
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import base64
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return base64.b64encode(bytes.fromhex(_PNG_HEX)).decode()
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def _fake_response(*, b64=None, url=None, revised_prompt=None):
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item = SimpleNamespace(b64_json=b64, url=url, revised_prompt=revised_prompt)
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return SimpleNamespace(data=[item])
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@pytest.fixture(autouse=True)
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def _tmp_hermes_home(tmp_path, monkeypatch):
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monkeypatch.setenv("HERMES_HOME", str(tmp_path))
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yield tmp_path
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@pytest.fixture
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def provider(monkeypatch):
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monkeypatch.setenv("OPENAI_API_KEY", "test-key")
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return openai_plugin.OpenAIImageGenProvider()
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def _patched_openai(fake_client: MagicMock):
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fake_openai = MagicMock()
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fake_openai.OpenAI.return_value = fake_client
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return patch.dict("sys.modules", {"openai": fake_openai})
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# ── Metadata ────────────────────────────────────────────────────────────────
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class TestMetadata:
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def test_name(self, provider):
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assert provider.name == "openai"
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def test_default_model(self, provider):
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assert provider.default_model() == "gpt-image-2-medium"
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def test_list_models_three_tiers(self, provider):
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ids = [m["id"] for m in provider.list_models()]
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assert ids == ["gpt-image-2-low", "gpt-image-2-medium", "gpt-image-2-high"]
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def test_catalog_entries_have_display_speed_strengths(self, provider):
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for entry in provider.list_models():
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assert entry["display"].startswith("GPT Image 2")
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assert entry["speed"]
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assert entry["strengths"]
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# ── Availability ────────────────────────────────────────────────────────────
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class TestAvailability:
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def test_no_api_key_unavailable(self, monkeypatch):
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monkeypatch.delenv("OPENAI_API_KEY", raising=False)
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assert openai_plugin.OpenAIImageGenProvider().is_available() is False
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def test_api_key_set_available(self, monkeypatch):
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monkeypatch.setenv("OPENAI_API_KEY", "test")
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assert openai_plugin.OpenAIImageGenProvider().is_available() is True
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# ── Model resolution ────────────────────────────────────────────────────────
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class TestModelResolution:
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def test_default_is_medium(self):
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model_id, meta = openai_plugin._resolve_model()
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assert model_id == "gpt-image-2-medium"
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assert meta["quality"] == "medium"
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def test_env_var_override(self, monkeypatch):
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monkeypatch.setenv("OPENAI_IMAGE_MODEL", "gpt-image-2-high")
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model_id, meta = openai_plugin._resolve_model()
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assert model_id == "gpt-image-2-high"
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assert meta["quality"] == "high"
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def test_env_var_unknown_falls_back(self, monkeypatch):
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monkeypatch.setenv("OPENAI_IMAGE_MODEL", "bogus-tier")
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model_id, _ = openai_plugin._resolve_model()
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assert model_id == openai_plugin.DEFAULT_MODEL
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def test_config_openai_model(self, tmp_path):
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import yaml
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(tmp_path / "config.yaml").write_text(
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yaml.safe_dump({"image_gen": {"openai": {"model": "gpt-image-2-low"}}})
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)
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model_id, meta = openai_plugin._resolve_model()
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assert model_id == "gpt-image-2-low"
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assert meta["quality"] == "low"
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def test_config_top_level_model(self, tmp_path):
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"""``image_gen.model: gpt-image-2-high`` also works (top-level)."""
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import yaml
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(tmp_path / "config.yaml").write_text(
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yaml.safe_dump({"image_gen": {"model": "gpt-image-2-high"}})
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)
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model_id, meta = openai_plugin._resolve_model()
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assert model_id == "gpt-image-2-high"
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assert meta["quality"] == "high"
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# ── Generate ────────────────────────────────────────────────────────────────
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class TestGenerate:
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def test_empty_prompt_rejected(self, provider):
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result = provider.generate("", aspect_ratio="square")
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assert result["success"] is False
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assert result["error_type"] == "invalid_argument"
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def test_missing_api_key(self, monkeypatch):
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monkeypatch.delenv("OPENAI_API_KEY", raising=False)
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result = openai_plugin.OpenAIImageGenProvider().generate("a cat")
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assert result["success"] is False
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assert result["error_type"] == "auth_required"
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def test_b64_saves_to_cache(self, provider, tmp_path):
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png_bytes = bytes.fromhex(_PNG_HEX)
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fake_client = MagicMock()
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fake_client.images.generate.return_value = _fake_response(b64=_b64_png())
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with _patched_openai(fake_client):
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result = provider.generate("a cat", aspect_ratio="landscape")
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assert result["success"] is True
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assert result["model"] == "gpt-image-2-medium"
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assert result["aspect_ratio"] == "landscape"
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assert result["provider"] == "openai"
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assert result["quality"] == "medium"
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saved = Path(result["image"])
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assert saved.exists()
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assert saved.parent == tmp_path / "cache" / "images"
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assert saved.read_bytes() == png_bytes
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call_kwargs = fake_client.images.generate.call_args.kwargs
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# All tiers hit the single underlying API model.
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assert call_kwargs["model"] == "gpt-image-2"
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assert call_kwargs["quality"] == "medium"
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assert call_kwargs["size"] == "1536x1024"
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# gpt-image-2 rejects response_format — we must NOT send it.
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assert "response_format" not in call_kwargs
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@pytest.mark.parametrize("tier,expected_quality", [
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("gpt-image-2-low", "low"),
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("gpt-image-2-medium", "medium"),
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("gpt-image-2-high", "high"),
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])
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def test_tier_maps_to_quality(self, provider, monkeypatch, tier, expected_quality):
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monkeypatch.setenv("OPENAI_IMAGE_MODEL", tier)
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fake_client = MagicMock()
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fake_client.images.generate.return_value = _fake_response(b64=_b64_png())
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with _patched_openai(fake_client):
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result = provider.generate("a cat")
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assert result["model"] == tier
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assert result["quality"] == expected_quality
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assert fake_client.images.generate.call_args.kwargs["quality"] == expected_quality
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# Always the same underlying API model regardless of tier.
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assert fake_client.images.generate.call_args.kwargs["model"] == "gpt-image-2"
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@pytest.mark.parametrize("aspect,expected_size", [
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("landscape", "1536x1024"),
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("square", "1024x1024"),
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("portrait", "1024x1536"),
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])
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def test_aspect_ratio_mapping(self, provider, aspect, expected_size):
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fake_client = MagicMock()
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fake_client.images.generate.return_value = _fake_response(b64=_b64_png())
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with _patched_openai(fake_client):
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provider.generate("a cat", aspect_ratio=aspect)
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assert fake_client.images.generate.call_args.kwargs["size"] == expected_size
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def test_revised_prompt_passed_through(self, provider):
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fake_client = MagicMock()
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fake_client.images.generate.return_value = _fake_response(
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b64=_b64_png(), revised_prompt="A photo of a cat",
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)
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with _patched_openai(fake_client):
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result = provider.generate("a cat")
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assert result["revised_prompt"] == "A photo of a cat"
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def test_api_error_returns_error_response(self, provider):
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fake_client = MagicMock()
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fake_client.images.generate.side_effect = RuntimeError("boom")
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with _patched_openai(fake_client):
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result = provider.generate("a cat")
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assert result["success"] is False
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assert result["error_type"] == "api_error"
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assert "boom" in result["error"]
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def test_empty_response_data(self, provider):
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fake_client = MagicMock()
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fake_client.images.generate.return_value = SimpleNamespace(data=[])
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with _patched_openai(fake_client):
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result = provider.generate("a cat")
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assert result["success"] is False
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assert result["error_type"] == "empty_response"
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def test_url_response_is_cached_locally(self, provider):
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"""OpenAI URL response (if API ever returns one) is cached locally.
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Pre-fix this asserted the bare URL passed through; symmetric to the
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xAI #26942 fix. Even though gpt-image-2 returns b64 today, every
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``image_gen`` provider must guarantee the gateway gets a stable
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file path so ephemeral signed URLs can't expire mid-flight.
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"""
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fake_client = MagicMock()
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fake_client.images.generate.return_value = _fake_response(
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b64=None, url="https://example.com/img.png",
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)
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with _patched_openai(fake_client), patch(
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"plugins.image_gen.openai.save_url_image",
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return_value=Path("/tmp/openai_gpt-image-2_20260524_000000_deadbeef.png"),
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) as mock_save_url:
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result = provider.generate("a cat")
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assert result["success"] is True
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assert result["image"].startswith("/")
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assert "example.com" not in result["image"]
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mock_save_url.assert_called_once()
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def test_url_response_falls_back_to_bare_url_when_download_fails(self, provider):
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"""Cache failure must not turn into a tool error — symmetric with xAI."""
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import requests as req_lib
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fake_client = MagicMock()
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fake_client.images.generate.return_value = _fake_response(
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b64=None, url="https://example.com/img.png",
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)
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with _patched_openai(fake_client), patch(
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"plugins.image_gen.openai.save_url_image",
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side_effect=req_lib.HTTPError("404 from CDN"),
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):
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result = provider.generate("a cat")
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assert result["success"] is True
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assert result["image"] == "https://example.com/img.png"
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