214 lines
9.3 KiB
Python
214 lines
9.3 KiB
Python
"""Tests for agent/image_routing.py — the per-turn image input mode decision."""
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from __future__ import annotations
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import base64
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from pathlib import Path
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from unittest.mock import patch
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import pytest
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from agent.image_routing import (
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_coerce_mode,
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_explicit_aux_vision_override,
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build_native_content_parts,
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decide_image_input_mode,
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)
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# ─── _coerce_mode ────────────────────────────────────────────────────────────
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class TestCoerceMode:
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def test_valid_modes_pass_through(self):
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assert _coerce_mode("auto") == "auto"
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assert _coerce_mode("native") == "native"
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assert _coerce_mode("text") == "text"
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def test_case_insensitive(self):
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assert _coerce_mode("NATIVE") == "native"
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assert _coerce_mode("Auto") == "auto"
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def test_invalid_falls_back_to_auto(self):
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assert _coerce_mode("nonsense") == "auto"
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assert _coerce_mode("") == "auto"
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assert _coerce_mode(None) == "auto"
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assert _coerce_mode(42) == "auto"
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def test_strips_whitespace(self):
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assert _coerce_mode(" native ") == "native"
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# ─── _explicit_aux_vision_override ───────────────────────────────────────────
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class TestExplicitAuxVisionOverride:
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def test_none_config(self):
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assert _explicit_aux_vision_override(None) is False
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def test_empty_config(self):
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assert _explicit_aux_vision_override({}) is False
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def test_default_auto_is_not_explicit(self):
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cfg = {"auxiliary": {"vision": {"provider": "auto", "model": "", "base_url": ""}}}
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assert _explicit_aux_vision_override(cfg) is False
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def test_provider_set_is_explicit(self):
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cfg = {"auxiliary": {"vision": {"provider": "openrouter", "model": ""}}}
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assert _explicit_aux_vision_override(cfg) is True
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def test_model_set_is_explicit(self):
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cfg = {"auxiliary": {"vision": {"provider": "auto", "model": "google/gemini-2.5-flash"}}}
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assert _explicit_aux_vision_override(cfg) is True
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def test_base_url_set_is_explicit(self):
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cfg = {"auxiliary": {"vision": {"provider": "auto", "base_url": "http://localhost:11434"}}}
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assert _explicit_aux_vision_override(cfg) is True
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# ─── decide_image_input_mode ─────────────────────────────────────────────────
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class TestDecideImageInputMode:
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def test_explicit_native_overrides_everything(self):
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cfg = {"agent": {"image_input_mode": "native"}}
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# Non-vision model, aux-vision explicitly configured: native still wins.
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cfg["auxiliary"] = {"vision": {"provider": "openrouter", "model": "foo"}}
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with patch("agent.image_routing._lookup_supports_vision", return_value=False):
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assert decide_image_input_mode("openrouter", "some-non-vision-model", cfg) == "native"
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def test_explicit_text_overrides_everything(self):
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cfg = {"agent": {"image_input_mode": "text"}}
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with patch("agent.image_routing._lookup_supports_vision", return_value=True):
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assert decide_image_input_mode("anthropic", "claude-sonnet-4", cfg) == "text"
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def test_auto_with_vision_capable_model(self):
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with patch("agent.image_routing._lookup_supports_vision", return_value=True):
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assert decide_image_input_mode("anthropic", "claude-sonnet-4", {}) == "native"
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def test_auto_with_non_vision_model(self):
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with patch("agent.image_routing._lookup_supports_vision", return_value=False):
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assert decide_image_input_mode("openrouter", "qwen/qwen3-235b", {}) == "text"
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def test_auto_with_unknown_model(self):
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with patch("agent.image_routing._lookup_supports_vision", return_value=None):
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assert decide_image_input_mode("openrouter", "brand-new-slug", {}) == "text"
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def test_auto_respects_aux_vision_override_even_for_vision_model(self):
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"""If the user configured a dedicated vision backend, don't bypass it."""
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cfg = {"auxiliary": {"vision": {"provider": "openrouter", "model": "google/gemini-2.5-flash"}}}
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with patch("agent.image_routing._lookup_supports_vision", return_value=True):
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assert decide_image_input_mode("anthropic", "claude-sonnet-4", cfg) == "text"
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def test_none_config_is_auto(self):
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with patch("agent.image_routing._lookup_supports_vision", return_value=True):
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assert decide_image_input_mode("anthropic", "claude-sonnet-4", None) == "native"
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def test_invalid_mode_coerces_to_auto(self):
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cfg = {"agent": {"image_input_mode": "weird-value"}}
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with patch("agent.image_routing._lookup_supports_vision", return_value=True):
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assert decide_image_input_mode("anthropic", "claude-sonnet-4", cfg) == "native"
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# ─── build_native_content_parts ──────────────────────────────────────────────
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def _png_bytes() -> bytes:
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"""Return a tiny valid 1x1 transparent PNG."""
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return base64.b64decode(
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"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR4nGNgYGBgAAAABQABpfZFQAAAAABJRU5ErkJggg=="
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)
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class TestBuildNativeContentParts:
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def test_text_then_image(self, tmp_path: Path):
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img = tmp_path / "cat.png"
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img.write_bytes(_png_bytes())
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parts, skipped = build_native_content_parts("hello", [str(img)])
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assert skipped == []
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assert len(parts) == 2
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assert parts[0] == {"type": "text", "text": "hello"}
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assert parts[1]["type"] == "image_url"
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assert parts[1]["image_url"]["url"].startswith("data:image/png;base64,")
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def test_empty_text_inserts_default_prompt(self, tmp_path: Path):
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img = tmp_path / "cat.jpg"
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img.write_bytes(_png_bytes())
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parts, skipped = build_native_content_parts("", [str(img)])
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assert skipped == []
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# Even with empty user text, we insert a neutral prompt so the turn
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# isn't just pixels.
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assert parts[0]["type"] == "text"
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assert parts[0]["text"] == "What do you see in this image?"
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assert parts[1]["type"] == "image_url"
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def test_missing_file_is_skipped(self, tmp_path: Path):
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parts, skipped = build_native_content_parts("hi", [str(tmp_path / "missing.png")])
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assert skipped == [str(tmp_path / "missing.png")]
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# Only text remains.
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assert parts == [{"type": "text", "text": "hi"}]
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def test_multiple_images(self, tmp_path: Path):
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img1 = tmp_path / "a.png"
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img2 = tmp_path / "b.png"
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img1.write_bytes(_png_bytes())
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img2.write_bytes(_png_bytes())
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parts, skipped = build_native_content_parts("compare these", [str(img1), str(img2)])
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assert skipped == []
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image_parts = [p for p in parts if p.get("type") == "image_url"]
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assert len(image_parts) == 2
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def test_mime_inference_jpg(self, tmp_path: Path):
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img = tmp_path / "photo.jpg"
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img.write_bytes(_png_bytes()) # bytes are PNG but extension is jpg
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parts, _ = build_native_content_parts("x", [str(img)])
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url = parts[1]["image_url"]["url"]
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assert url.startswith("data:image/jpeg;base64,")
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def test_mime_inference_webp(self, tmp_path: Path):
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img = tmp_path / "pic.webp"
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img.write_bytes(_png_bytes())
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parts, _ = build_native_content_parts("", [str(img)])
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url = parts[1]["image_url"]["url"]
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assert url.startswith("data:image/webp;base64,")
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# ─── Oversize handling ───────────────────────────────────────────────────────
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class TestLargeImageHandling:
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"""Large images attach at native size; shrink is handled reactively at
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retry time in ``run_agent._try_shrink_image_parts_in_messages`` rather
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than proactively here.
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"""
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def test_large_image_passes_through_unchanged(self, tmp_path: Path):
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"""A multi-MB image is attached as-is — no resize, no skip."""
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from agent import image_routing as _ir
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img = tmp_path / "medium.png"
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# 200 KB of real bytes; not huge but enough to verify no size gate fires.
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img.write_bytes(b"\x89PNG\r\n\x1a\n" + b"X" * 200_000)
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url = _ir._file_to_data_url(img)
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assert url is not None
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assert url.startswith("data:image/png;base64,")
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# Base64 expansion means output is ~4/3 of input, plus header.
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assert len(url) > 200_000
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def test_missing_file_returns_none(self, tmp_path: Path):
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from agent import image_routing as _ir
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missing = tmp_path / "does_not_exist.png"
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assert _ir._file_to_data_url(missing) is None
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def test_build_native_parts_no_provider_kwarg(self, tmp_path: Path):
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"""build_native_content_parts takes text + paths, no provider kwarg."""
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from agent import image_routing as _ir
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img = tmp_path / "cat.png"
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img.write_bytes(_png_bytes())
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parts, skipped = _ir.build_native_content_parts("hi", [str(img)])
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assert skipped == []
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assert len(parts) == 2
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assert parts[0]["type"] == "text"
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assert parts[1]["type"] == "image_url"
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