view models

apps/website/lib/view-models/RecordEngagementInputViewModel.test.ts

@@ -0,0 +1,47 @@
+import { describe, it, expect } from 'vitest';
+import { RecordEngagementInputViewModel } from './RecordEngagementInputViewModel';
+
+describe('RecordEngagementInputViewModel', () => {
+  it('maps basic fields from input data', () => {
+    const vm = new RecordEngagementInputViewModel({
+      eventType: 'button_click',
+      userId: 'user-1',
+      metadata: { key: 'value' },
+    });
+
+    expect(vm.eventType).toBe('button_click');
+    expect(vm.userId).toBe('user-1');
+    expect(vm.metadata).toEqual({ key: 'value' });
+  });
+
+  it('derives displayEventType from snake_case eventType', () => {
+    const vm = new RecordEngagementInputViewModel({
+      eventType: 'page_view',
+    });
+
+    expect(vm.displayEventType).toBe('Page View');
+  });
+
+  it('detects presence of metadata and counts keys', () => {
+    const withMetadata = new RecordEngagementInputViewModel({
+      eventType: 'test',
+      metadata: { a: 1, b: 2 },
+    });
+    const withoutMetadata = new RecordEngagementInputViewModel({
+      eventType: 'test',
+    });
+    const emptyMetadata = new RecordEngagementInputViewModel({
+      eventType: 'test',
+      metadata: {},
+    });
+
+    expect(withMetadata.hasMetadata).toBe(true);
+    expect(withMetadata.metadataKeysCount).toBe(2);
+
+    expect(withoutMetadata.hasMetadata).toBe(false);
+    expect(withoutMetadata.metadataKeysCount).toBe(0);
+
+    expect(emptyMetadata.hasMetadata).toBe(false);
+    expect(emptyMetadata.metadataKeysCount).toBe(0);
+  });
+});