test: add tests for visual state verifier module

Relates to #1482

tests/test_visual_state_verifier.py

@@ -0,0 +1,113 @@
+"""Tests for visual state verification module."""
+import json
+import tempfile
+from pathlib import Path
+import pytest
+
+# Add parent to path for import
+import sys
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from scripts.visual_state_verifier import (
+    VisualStateVerifier,
+    VerificationResult,
+    VerificationStatus,
+)
+
+
+class TestVisualStateVerifier:
+    """Test the visual state verifier."""
+
+    def test_missing_screenshot_returns_error(self):
+        verifier = VisualStateVerifier()
+        result = verifier.verify_state(
+            screenshot_path="/nonexistent/screenshot.png",
+            expected_state={"location": "Balmora"},
+            game="morrowind"
+        )
+        assert result.status == VerificationStatus.ERROR
+        assert not result.verified
+        assert "not found" in result.details.lower()
+
+    def test_morrowind_state_builder(self):
+        state = VisualStateVerifier.morrowind_state(
+            location="Balmora",
+            health_min=50,
+            has_weapon=True,
+            nearby_npcs=["Caius Cosades"]
+        )
+        assert state["location"] == "Balmora"
+        assert state["health_above"] == 50
+        assert state["has_weapon"] is True
+        assert state["nearby_npcs"] == ["Caius Cosades"]
+
+    def test_morrowind_state_minimal(self):
+        state = VisualStateVerifier.morrowind_state(location="Vivec")
+        assert state == {"location": "Vivec"}
+
+    def test_morrowind_state_with_extras(self):
+        state = VisualStateVerifier.morrowind_state(
+            location="Balmora",
+            quest_complete=True,
+            gold_min=1000
+        )
+        assert state["quest_complete"] is True
+        assert state["gold_min"] == 1000
+
+    def test_prompt_includes_conditions(self):
+        verifier = VisualStateVerifier()
+        expected = {"location": "Balmora", "health_above": 50}
+        prompt = verifier._build_prompt(expected, "Test context", "morrowind")
+        assert "Balmora" in prompt
+        assert "50" in prompt
+        assert "Test context" in prompt
+        assert "morrowind" in prompt
+
+    def test_parse_analysis_returns_pending_for_raw(self):
+        verifier = VisualStateVerifier()
+        raw_analysis = json.dumps({
+            "prompt": "test",
+            "screenshot_path": "/tmp/test.png",
+            "instruction": "Use vision_analyze"
+        })
+        result = verifier._parse_analysis(raw_analysis, {}, "/tmp/test.png")
+        assert result.status == VerificationStatus.UNCERTAIN
+        assert not result.verified
+
+    def test_parse_analysis_extracts_json(self):
+        verifier = VisualStateVerifier()
+        analysis = """
+        The player appears to be in Balmora.
+        Health looks good.
+
+        ```json
+        {
+            "verified": true,
+            "confidence": 0.85,
+            "details": "Player is in Balmora with weapon equipped",
+            "mismatches": []
+        }
+        ```
+        """
+        result = verifier._parse_analysis(analysis, {"location": "Balmora"}, "/tmp/test.png")
+        assert result.status == VerificationStatus.VERIFIED
+        assert result.verified
+        assert result.confidence == 0.85
+        assert result.mismatches == []
+
+    def test_parse_analysis_handles_failures(self):
+        verifier = VisualStateVerifier()
+        analysis = """
+        ```json
+        {
+            "verified": false,
+            "confidence": 0.9,
+            "details": "Player is not in Balmora",
+            "mismatches": ["location"]
+        }
+        ```
+        """
+        result = verifier._parse_analysis(analysis, {"location": "Balmora"}, "/tmp/test.png")
+        assert result.status == VerificationStatus.FAILED
+        assert not result.verified
+        assert "location" in result.mismatches