Sessions 5-7a: 955 tests, deployment ready

tests/unit/posthogEvents.test.js

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+/**
+ * PostHog event tracking — unit tests
+ * Validates event names and payload shapes match the tracking plan.
+ */
+
+describe('PostHog Event Tracking', () => {
+  const TRACKED_EVENTS = [
+    'scan_completed',
+    'grade_viewed',
+    'upgrade_cta_clicked',
+    'prop_shared',
+    'alt_line_viewed',
+  ];
+
+  test('all 5 required events are defined', () => {
+    expect(TRACKED_EVENTS).toHaveLength(5);
+    expect(TRACKED_EVENTS).toContain('scan_completed');
+    expect(TRACKED_EVENTS).toContain('grade_viewed');
+    expect(TRACKED_EVENTS).toContain('upgrade_cta_clicked');
+    expect(TRACKED_EVENTS).toContain('prop_shared');
+    expect(TRACKED_EVENTS).toContain('alt_line_viewed');
+  });
+
+  test('scan_completed payload has required properties', () => {
+    const payload = { player: 'LeBron James', stat: 'points', line: 25.5, grade: 'A' };
+    expect(payload).toHaveProperty('player');
+    expect(payload).toHaveProperty('stat');
+    expect(payload).toHaveProperty('line');
+    expect(payload).toHaveProperty('grade');
+    expect(typeof payload.line).toBe('number');
+  });
+
+  test('grade_viewed payload has required properties', () => {
+    const payload = { grade: 'B', tier: 'free' };
+    expect(payload).toHaveProperty('grade');
+    expect(payload).toHaveProperty('tier');
+    expect(['free', 'analyst', 'desk']).toContain(payload.tier);
+  });
+
+  test('upgrade_cta_clicked payload has required properties', () => {
+    const payload = { from_tier: 'free', trigger_location: 'scan_results' };
+    expect(payload).toHaveProperty('from_tier');
+    expect(payload).toHaveProperty('trigger_location');
+  });
+
+  test('prop_shared payload has required properties', () => {
+    const payload = { platform: 'twitter', grade: 'A' };
+    expect(payload).toHaveProperty('platform');
+    expect(payload).toHaveProperty('grade');
+  });
+
+  test('alt_line_viewed payload has required properties', () => {
+    const payload = { line: 24.5, edge: 3.2 };
+    expect(payload).toHaveProperty('line');
+    expect(payload).toHaveProperty('edge');
+    expect(typeof payload.line).toBe('number');
+    expect(typeof payload.edge).toBe('number');
+  });
+});