Add tests for cross-document comparison tools

tests/test_tools/test_comparison.py

@@ -0,0 +1,63 @@
+"""Tests for cross-document comparison tools."""
+
+from factor.tools.comparison import compare_across_documents
+
+
+def test_compare_detects_jurisdiction_inconsistency(sample_provisions_by_doc):
+    """Verify governing law inconsistencies are detected across documents."""
+    result = compare_across_documents(provisions_by_doc=sample_provisions_by_doc)
+    assert result["total_documents"] == 2
+    assert result["is_synthetic"] is True
+    gov_law = [c for c in result["comparisons"] if c["provision_type"] == "governing_law"]
+    assert len(gov_law) == 1
+    assert len(gov_law[0]["inconsistencies"]) > 0
+
+
+def test_compare_detects_liability_cap_inconsistency(sample_provisions_by_doc):
+    """Verify liability cap inconsistencies are flagged."""
+    result = compare_across_documents(provisions_by_doc=sample_provisions_by_doc)
+    indem = [c for c in result["comparisons"] if c["provision_type"] == "indemnification"]
+    assert len(indem) == 1
+    assert len(indem[0]["inconsistencies"]) > 0
+
+
+def test_compare_single_document():
+    """No comparisons should be produced with only one document."""
+    result = compare_across_documents(provisions_by_doc={
+        "doc-1": [{"provision_type": "termination", "text": "30 days notice required."}],
+    })
+    assert result["comparisons"] == []
+    assert result["total_documents"] == 1
+
+
+def test_compare_empty_input():
+    """Empty input should return empty comparisons."""
+    result = compare_across_documents(provisions_by_doc={})
+    assert result["total_documents"] == 0
+    assert result["comparisons"] == []
+
+
+def test_compare_identical_provisions():
+    """Identical provisions across docs should not flag language variations."""
+    same_text = "This Agreement shall be governed by the laws of Delaware."
+    result = compare_across_documents(provisions_by_doc={
+        "doc-1": [{"provision_type": "governing_law", "text": same_text}],
+        "doc-2": [{"provision_type": "governing_law", "text": same_text}],
+    })
+    gov_law = [c for c in result["comparisons"] if c["provision_type"] == "governing_law"]
+    assert len(gov_law) == 1
+    text_variations = [
+        i for i in gov_law[0]["inconsistencies"] if "Language varies" in i
+    ]
+    assert len(text_variations) == 0
+
+
+def test_compare_termination_cure_period_inconsistency():
+    """Cure period present in one doc but absent in another should be flagged."""
+    result = compare_across_documents(provisions_by_doc={
+        "doc-1": [{"provision_type": "termination", "text": "Either party may terminate with 30 days cure period."}],
+        "doc-2": [{"provision_type": "termination", "text": "Either party may terminate immediately."}],
+    })
+    term = [c for c in result["comparisons"] if c["provision_type"] == "termination"]
+    assert len(term) == 1
+    assert any("Cure period" in i for i in term[0]["inconsistencies"])