view data fixes

apps/website/lib/builders/view-data/AnalyticsDashboardViewDataBuilder.test.ts

@@ -0,0 +1,78 @@
+import { describe, it, expect } from 'vitest';
+import { AnalyticsDashboardViewDataBuilder } from './AnalyticsDashboardViewDataBuilder';
+import { AnalyticsDashboardInputViewData } from '@/lib/view-data/AnalyticsDashboardInputViewData';
+
+describe('AnalyticsDashboardViewDataBuilder', () => {
+  it('builds ViewData from AnalyticsDashboardInputViewData', () => {
+    const inputViewData: AnalyticsDashboardInputViewData = {
+      totalUsers: 100,
+      activeUsers: 40,
+      totalRaces: 10,
+      totalLeagues: 5,
+    };
+
+    const viewData = AnalyticsDashboardViewDataBuilder.build(inputViewData);
+
+    expect(viewData.metrics.totalUsers).toBe(100);
+    expect(viewData.metrics.activeUsers).toBe(40);
+    expect(viewData.metrics.totalRaces).toBe(10);
+    expect(viewData.metrics.totalLeagues).toBe(5);
+    expect(viewData.metrics.userEngagementRate).toBeCloseTo(40);
+    expect(viewData.metrics.formattedEngagementRate).toBe('40.0%');
+    expect(viewData.metrics.activityLevel).toBe('Low');
+  });
+
+  it('computes engagement rate and formatted engagement rate', () => {
+    const inputViewData: AnalyticsDashboardInputViewData = {
+      totalUsers: 200,
+      activeUsers: 50,
+      totalRaces: 0,
+      totalLeagues: 0,
+    };
+
+    const viewData = AnalyticsDashboardViewDataBuilder.build(inputViewData);
+
+    expect(viewData.metrics.userEngagementRate).toBeCloseTo(25);
+    expect(viewData.metrics.formattedEngagementRate).toBe('25.0%');
+  });
+
+  it('handles zero users safely', () => {
+    const inputViewData: AnalyticsDashboardInputViewData = {
+      totalUsers: 0,
+      activeUsers: 0,
+      totalRaces: 0,
+      totalLeagues: 0,
+    };
+
+    const viewData = AnalyticsDashboardViewDataBuilder.build(inputViewData);
+
+    expect(viewData.metrics.userEngagementRate).toBe(0);
+    expect(viewData.metrics.formattedEngagementRate).toBe('0.0%');
+    expect(viewData.metrics.activityLevel).toBe('Low');
+  });
+
+  it('derives activity level buckets from engagement rate', () => {
+    const low = AnalyticsDashboardViewDataBuilder.build({
+      totalUsers: 100,
+      activeUsers: 30,
+      totalRaces: 0,
+      totalLeagues: 0,
+    });
+    const medium = AnalyticsDashboardViewDataBuilder.build({
+      totalUsers: 100,
+      activeUsers: 50,
+      totalRaces: 0,
+      totalLeagues: 0,
+    });
+    const high = AnalyticsDashboardViewDataBuilder.build({
+      totalUsers: 100,
+      activeUsers: 90,
+      totalRaces: 0,
+      totalLeagues: 0,
+    });
+
+    expect(low.metrics.activityLevel).toBe('Low');
+    expect(medium.metrics.activityLevel).toBe('Medium');
+    expect(high.metrics.activityLevel).toBe('High');
+  });
+});