test: expand coverage to tools layer and model validators

tests/test_agents.py

@@ -1,6 +1,8 @@
 from unittest.mock import AsyncMock, patch
 import pytest
 from app.agents import repo_analysis_agent, bug_detection_agent
+from app.models.issue import IssueReport, Bug, Warning, Suggestion
+from app.models.repository import RepositoryRequest
 
 
 @pytest.mark.asyncio
@@ -22,4 +24,53 @@ async def test_bug_detection_agent_returns_report():
         patch("app.agents.bug_detection_agent.call_llm", new=AsyncMock(return_value="{}")),
     ):
         result = await bug_detection_agent.run("/tmp/fake")
-    assert result.total_critical == 0
+    assert result.total_critical == 0
+
+def test_issue_report_totals_computed_automatically():
+    report = IssueReport(
+        critical=[Bug(description="null ptr", file="main.py")],
+        warnings=[Warning(description="unused var", file="utils.py")],
+        suggestions=[Suggestion(description="use walrus operator", file="utils.py")],
+    )
+    assert report.total_critical == 1
+    assert report.total_warnings == 1
+    assert report.total_suggestions == 1
+
+
+def test_issue_report_totals_empty():
+    report = IssueReport()
+    assert report.total_critical == 0
+    assert report.total_warnings == 0
+    assert report.total_suggestions == 0
+
+
+def test_repository_request_rejects_invalid_url():
+    with pytest.raises(Exception):
+        RepositoryRequest(github_url="http://not-github.com/owner/repo")
+
+
+def test_repository_request_rejects_bare_domain():
+    with pytest.raises(Exception):
+        RepositoryRequest(github_url="https://github.com")
+
+
+def test_repository_request_accepts_valid_url():
+    req = RepositoryRequest(github_url="https://github.com/owner/repo")
+    assert req.github_url == "https://github.com/owner/repo"
+
+
+@pytest.mark.asyncio
+async def test_code_review_agent_no_source_files():
+    from unittest.mock import patch
+    from app.agents import code_review_agent
+    from app.models.repository import RepositoryMetadata
+
+    metadata = RepositoryMetadata(
+        url="https://github.com/test/repo",
+        name="repo",
+        local_path="/tmp/fake",
+    )
+    with patch("app.agents.code_review_agent.get_python_files", return_value=[]):
+        result = await code_review_agent.run("/tmp/fake", metadata)
+    assert result.overall_score == 0.0
+    assert "No source files" in result.summary