test: add unit tests for scorecard_service.py edge cases

Adds tests/dashboard/test_scorecard_service.py with 31 unit tests
covering gaps not addressed in test_scorecards.py:
- _aggregate_metrics: test.execution events, PR-closed-without-merge,
  push with no num_commits key, issue/PR events with number=0,
  untracked agent with agent_id field passthrough
- _detect_patterns: boundary conditions (< 3 PRs threshold, exactly 80%
  merge rate, commit count boundary at 10 vs 11, token net boundaries)
- _generate_narrative_bullets: singular/plural forms for all activity types
- generate_scorecard: token augmentation max() logic (event vs ledger)
- ScorecardSummary.to_dict: ISO timestamp format, tests_affected count

Fixes #1139

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/dashboard/test_scorecard_service.py

@@ -0,0 +1,458 @@
+"""Unit tests for dashboard/services/scorecard_service.py.
+
+Focuses on edge cases and scenarios not covered in test_scorecards.py:
+- _aggregate_metrics: test.execution events, PR-closed-without-merge,
+  push default commit count, untracked agent with agent_id passthrough
+- _detect_patterns: boundary conditions (< 3 PRs, exactly 3, exactly 80%)
+- _generate_narrative_bullets: singular/plural forms
+- generate_scorecard: token augmentation max() logic
+- ScorecardSummary.to_dict(): ISO timestamp format, tests_affected count
+"""
+
+from __future__ import annotations
+
+from datetime import UTC, datetime
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+pytestmark = pytest.mark.unit
+
+from dashboard.services.scorecard_service import (
+    AgentMetrics,
+    PeriodType,
+    ScorecardSummary,
+    _aggregate_metrics,
+    _detect_patterns,
+    _generate_narrative_bullets,
+    generate_scorecard,
+)
+from infrastructure.events.bus import Event
+
+
+# ---------------------------------------------------------------------------
+# _aggregate_metrics — edge cases
+# ---------------------------------------------------------------------------
+
+
+class TestAggregateMetricsEdgeCases:
+    """Edge cases for _aggregate_metrics not covered in test_scorecards.py."""
+
+    def test_push_event_defaults_to_one_commit(self):
+        """Push event with no num_commits key should count as 1 commit."""
+        events = [
+            Event(type="gitea.push", source="gitea", data={"actor": "claude"}),
+        ]
+        result = _aggregate_metrics(events)
+
+        assert result["claude"].commits == 1
+
+    def test_pr_closed_without_merge_not_counted(self):
+        """PR closed without merge should not appear in prs_merged."""
+        events = [
+            Event(
+                type="gitea.pull_request",
+                source="gitea",
+                data={"actor": "kimi", "pr_number": 99, "action": "closed", "merged": False},
+            ),
+        ]
+        result = _aggregate_metrics(events)
+
+        # PR was not merged — should not be in prs_merged
+        assert "kimi" in result
+        assert 99 not in result["kimi"].prs_merged
+        # Also not counted as opened (action != "opened")
+        assert 99 not in result["kimi"].prs_opened
+        # Not touched (only merged PRs add to issues_touched)
+        assert 99 not in result["kimi"].issues_touched
+
+    def test_test_execution_event_aggregation(self):
+        """test.execution events should populate tests_affected."""
+        events = [
+            Event(
+                type="test.execution",
+                source="ci",
+                data={"actor": "gemini", "test_files": ["tests/test_alpha.py", "tests/test_beta.py"]},
+            ),
+        ]
+        result = _aggregate_metrics(events)
+
+        assert "gemini" in result
+        assert "tests/test_alpha.py" in result["gemini"].tests_affected
+        assert "tests/test_beta.py" in result["gemini"].tests_affected
+
+    def test_untracked_agent_with_agent_id_field_included(self):
+        """An untracked actor that carries agent_id in data should be included."""
+        events = [
+            Event(
+                type="agent.task.completed",
+                source="system",
+                data={"agent_id": "kimi", "tests_affected": [], "token_reward": 5},
+            ),
+        ]
+        result = _aggregate_metrics(events)
+
+        # kimi is tracked and agent_id is present in data
+        assert "kimi" in result
+        assert result["kimi"].tokens_earned == 5
+
+    def test_untracked_actor_without_agent_id_excluded(self):
+        """Actor that is not tracked and has no agent_id in data is skipped."""
+        events = [
+            Event(
+                type="gitea.push",
+                source="gitea",
+                data={"actor": "anon-bot", "num_commits": 10},
+            ),
+        ]
+        result = _aggregate_metrics(events)
+
+        assert "anon-bot" not in result
+
+    def test_issue_opened_with_no_issue_number_ignored(self):
+        """Issue opened event with issue_number=0 should not add to issues_touched."""
+        events = [
+            Event(
+                type="gitea.issue.opened",
+                source="gitea",
+                data={"actor": "hermes", "issue_number": 0},
+            ),
+        ]
+        result = _aggregate_metrics(events)
+
+        assert "hermes" in result
+        assert len(result["hermes"].issues_touched) == 0
+
+    def test_comment_with_no_issue_number_still_increments_counter(self):
+        """Comment event with issue_number=0 increments comment count but not issues_touched."""
+        events = [
+            Event(
+                type="gitea.issue.comment",
+                source="gitea",
+                data={"actor": "manus", "issue_number": 0},
+            ),
+        ]
+        result = _aggregate_metrics(events)
+
+        assert "manus" in result
+        assert result["manus"].comments == 1
+        assert len(result["manus"].issues_touched) == 0
+
+    def test_task_completion_no_tests_affected(self):
+        """Task completion with empty tests_affected list should work fine."""
+        events = [
+            Event(
+                type="agent.task.completed",
+                source="system",
+                data={"agent_id": "claude", "tests_affected": [], "token_reward": 20},
+            ),
+        ]
+        result = _aggregate_metrics(events)
+
+        assert "claude" in result
+        assert len(result["claude"].tests_affected) == 0
+        assert result["claude"].tokens_earned == 20
+
+    def test_multiple_agents_independent_metrics(self):
+        """Events from multiple agents are tracked independently."""
+        events = [
+            Event(type="gitea.push", source="gitea", data={"actor": "claude", "num_commits": 3}),
+            Event(type="gitea.push", source="gitea", data={"actor": "gemini", "num_commits": 7}),
+        ]
+        result = _aggregate_metrics(events)
+
+        assert result["claude"].commits == 3
+        assert result["gemini"].commits == 7
+
+    def test_pr_with_no_pr_number_not_recorded(self):
+        """PR event with pr_number=0 should not add to prs_opened."""
+        events = [
+            Event(
+                type="gitea.pull_request",
+                source="gitea",
+                data={"actor": "kimi", "pr_number": 0, "action": "opened"},
+            ),
+        ]
+        result = _aggregate_metrics(events)
+
+        assert "kimi" in result
+        assert len(result["kimi"].prs_opened) == 0
+
+
+# ---------------------------------------------------------------------------
+# _detect_patterns — boundary conditions
+# ---------------------------------------------------------------------------
+
+
+class TestDetectPatternsBoundaries:
+    """Boundary conditions for _detect_patterns."""
+
+    def test_no_patterns_with_empty_metrics(self):
+        """Empty metrics should not trigger any patterns."""
+        metrics = AgentMetrics(agent_id="kimi")
+        patterns = _detect_patterns(metrics)
+
+        assert patterns == []
+
+    def test_merge_rate_requires_three_or_more_prs(self):
+        """Merge rate pattern requires at least 3 PRs opened."""
+        metrics = AgentMetrics(
+            agent_id="kimi",
+            prs_opened={1, 2},
+            prs_merged={1, 2},  # 100% rate but only 2 PRs
+        )
+        patterns = _detect_patterns(metrics)
+
+        # Should NOT trigger high-merge-rate pattern (< 3 PRs)
+        assert not any("High merge rate" in p for p in patterns)
+        assert not any("low merge rate" in p for p in patterns)
+
+    def test_merge_rate_exactly_3_prs_triggers_pattern(self):
+        """Exactly 3 PRs opened triggers merge rate evaluation."""
+        metrics = AgentMetrics(
+            agent_id="kimi",
+            prs_opened={1, 2, 3},
+            prs_merged={1, 2, 3},  # 100% rate, 3 PRs
+        )
+        patterns = _detect_patterns(metrics)
+
+        assert any("High merge rate" in p for p in patterns)
+
+    def test_merge_rate_80_percent_is_high(self):
+        """Exactly 80% merge rate triggers high merge rate pattern."""
+        metrics = AgentMetrics(
+            agent_id="kimi",
+            prs_opened={1, 2, 3, 4, 5},
+            prs_merged={1, 2, 3, 4},  # 80%
+        )
+        patterns = _detect_patterns(metrics)
+
+        assert any("High merge rate" in p for p in patterns)
+
+    def test_merge_rate_below_80_not_high(self):
+        """79% merge rate should NOT trigger high merge rate pattern."""
+        metrics = AgentMetrics(
+            agent_id="kimi",
+            prs_opened={1, 2, 3, 4, 5, 6, 7},  # 7 PRs
+            prs_merged={1, 2, 3, 4, 5},  # ~71.4% — below 80%
+        )
+        patterns = _detect_patterns(metrics)
+
+        assert not any("High merge rate" in p for p in patterns)
+
+    def test_commit_pattern_requires_over_10_commits(self):
+        """Exactly 10 commits does NOT trigger the high-commit/no-PR pattern."""
+        metrics = AgentMetrics(
+            agent_id="kimi",
+            commits=10,
+            prs_opened=set(),
+        )
+        patterns = _detect_patterns(metrics)
+
+        assert not any("High commit volume" in p for p in patterns)
+
+    def test_commit_pattern_triggered_at_11_commits(self):
+        """11 commits with no PRs triggers the high-commit pattern."""
+        metrics = AgentMetrics(
+            agent_id="kimi",
+            commits=11,
+            prs_opened=set(),
+        )
+        patterns = _detect_patterns(metrics)
+
+        assert any("High commit volume without PRs" in p for p in patterns)
+
+    def test_token_accumulation_exact_boundary(self):
+        """Net tokens = 100 does NOT trigger accumulation pattern (must be > 100)."""
+        metrics = AgentMetrics(agent_id="kimi", tokens_earned=100, tokens_spent=0)
+        patterns = _detect_patterns(metrics)
+
+        assert not any("Strong token accumulation" in p for p in patterns)
+
+    def test_token_spend_exact_boundary(self):
+        """Net tokens = -50 does NOT trigger high spend pattern (must be < -50)."""
+        metrics = AgentMetrics(agent_id="kimi", tokens_earned=0, tokens_spent=50)
+        patterns = _detect_patterns(metrics)
+
+        assert not any("High token spend" in p for p in patterns)
+
+
+# ---------------------------------------------------------------------------
+# _generate_narrative_bullets — singular/plural
+# ---------------------------------------------------------------------------
+
+
+class TestGenerateNarrativeSingularPlural:
+    """Test singular and plural forms in narrative bullets."""
+
+    def test_singular_commit(self):
+        """One commit should use singular form."""
+        metrics = AgentMetrics(agent_id="kimi", commits=1)
+        bullets = _generate_narrative_bullets(metrics, PeriodType.daily)
+
+        activity = next((b for b in bullets if "Active across" in b), None)
+        assert activity is not None
+        assert "1 commit" in activity
+        assert "1 commits" not in activity
+
+    def test_singular_pr_opened(self):
+        """One opened PR should use singular form."""
+        metrics = AgentMetrics(agent_id="kimi", prs_opened={1})
+        bullets = _generate_narrative_bullets(metrics, PeriodType.daily)
+
+        activity = next((b for b in bullets if "Active across" in b), None)
+        assert activity is not None
+        assert "1 PR opened" in activity
+
+    def test_singular_pr_merged(self):
+        """One merged PR should use singular form."""
+        metrics = AgentMetrics(agent_id="kimi", prs_merged={1})
+        bullets = _generate_narrative_bullets(metrics, PeriodType.daily)
+
+        activity = next((b for b in bullets if "Active across" in b), None)
+        assert activity is not None
+        assert "1 PR merged" in activity
+
+    def test_singular_issue_touched(self):
+        """One issue touched should use singular form."""
+        metrics = AgentMetrics(agent_id="kimi", issues_touched={42})
+        bullets = _generate_narrative_bullets(metrics, PeriodType.daily)
+
+        activity = next((b for b in bullets if "Active across" in b), None)
+        assert activity is not None
+        assert "1 issue touched" in activity
+
+    def test_singular_comment(self):
+        """One comment should use singular form."""
+        metrics = AgentMetrics(agent_id="kimi", comments=1)
+        bullets = _generate_narrative_bullets(metrics, PeriodType.daily)
+
+        activity = next((b for b in bullets if "Active across" in b), None)
+        assert activity is not None
+        assert "1 comment" in activity
+
+    def test_singular_test_file(self):
+        """One test file should use singular form."""
+        metrics = AgentMetrics(agent_id="kimi", tests_affected={"test_foo.py"})
+        bullets = _generate_narrative_bullets(metrics, PeriodType.daily)
+
+        assert any("1 test file." in b for b in bullets)
+
+    def test_weekly_period_label(self):
+        """Weekly period uses 'week' label in no-activity message."""
+        metrics = AgentMetrics(agent_id="kimi")
+        bullets = _generate_narrative_bullets(metrics, PeriodType.weekly)
+
+        assert any("this week" in b for b in bullets)
+
+
+# ---------------------------------------------------------------------------
+# generate_scorecard — token augmentation (max logic)
+# ---------------------------------------------------------------------------
+
+
+class TestGenerateScorecardTokenAugmentation:
+    """Test the max() token augmentation logic in generate_scorecard."""
+
+    def test_event_tokens_win_over_ledger_when_higher(self):
+        """When event tokens > ledger tokens, event tokens are preserved."""
+        events = [
+            Event(
+                type="agent.task.completed",
+                source="system",
+                data={"agent_id": "kimi", "tests_affected": [], "token_reward": 200},
+            ),
+        ]
+        with patch(
+            "dashboard.services.scorecard_service._collect_events_for_period",
+            return_value=events,
+        ):
+            with patch(
+                "dashboard.services.scorecard_service._query_token_transactions",
+                return_value=(50, 0),  # ledger says 50 earned
+            ):
+                scorecard = generate_scorecard("kimi", PeriodType.daily)
+
+        # max(200, 50) = 200 should win
+        assert scorecard.metrics.tokens_earned == 200
+
+    def test_ledger_tokens_win_when_higher(self):
+        """When ledger tokens > event tokens, ledger tokens are used."""
+        events = [
+            Event(
+                type="agent.task.completed",
+                source="system",
+                data={"agent_id": "kimi", "tests_affected": [], "token_reward": 10},
+            ),
+        ]
+        with patch(
+            "dashboard.services.scorecard_service._collect_events_for_period",
+            return_value=events,
+        ):
+            with patch(
+                "dashboard.services.scorecard_service._query_token_transactions",
+                return_value=(500, 100),  # ledger says 500 earned, 100 spent
+            ):
+                scorecard = generate_scorecard("kimi", PeriodType.daily)
+
+        # max(10, 500) = 500
+        assert scorecard.metrics.tokens_earned == 500
+        # max(0, 100) = 100
+        assert scorecard.metrics.tokens_spent == 100
+
+
+# ---------------------------------------------------------------------------
+# ScorecardSummary.to_dict — timestamp format and tests_affected
+# ---------------------------------------------------------------------------
+
+
+class TestScorecardSummaryToDict:
+    """Additional to_dict tests."""
+
+    def test_timestamps_are_iso_strings(self):
+        """period_start and period_end should be ISO format strings."""
+        start = datetime(2026, 3, 20, 0, 0, 0, tzinfo=UTC)
+        end = datetime(2026, 3, 21, 0, 0, 0, tzinfo=UTC)
+        summary = ScorecardSummary(
+            agent_id="kimi",
+            period_type=PeriodType.daily,
+            period_start=start,
+            period_end=end,
+            metrics=AgentMetrics(agent_id="kimi"),
+        )
+        data = summary.to_dict()
+
+        assert data["period_start"] == start.isoformat()
+        assert data["period_end"] == end.isoformat()
+
+    def test_tests_affected_count_in_dict(self):
+        """to_dict metrics.tests_affected should be a count (int)."""
+        metrics = AgentMetrics(
+            agent_id="kimi",
+            tests_affected={"test_a.py", "test_b.py", "test_c.py"},
+        )
+        summary = ScorecardSummary(
+            agent_id="kimi",
+            period_type=PeriodType.daily,
+            period_start=datetime.now(UTC),
+            period_end=datetime.now(UTC),
+            metrics=metrics,
+        )
+        data = summary.to_dict()
+
+        assert data["metrics"]["tests_affected"] == 3
+
+    def test_empty_narrative_and_patterns(self):
+        """to_dict with default empty lists should serialize correctly."""
+        summary = ScorecardSummary(
+            agent_id="claude",
+            period_type=PeriodType.weekly,
+            period_start=datetime.now(UTC),
+            period_end=datetime.now(UTC),
+            metrics=AgentMetrics(agent_id="claude"),
+        )
+        data = summary.to_dict()
+
+        assert data["narrative_bullets"] == []
+        assert data["patterns"] == []
+        assert data["period_type"] == "weekly"