chore(EAV-640): add test cases for calculateSegmentTiming

Author: ianshade

packages/live-status-gateway/src/topics/helpers/__tests__/segmentTiming.test.ts

@@ -0,0 +1,53 @@
+import { calculateSegmentTiming } from '../segmentTiming.js'
+import { DBPart } from '@sofie-automation/corelib/dist/dataModel/Part'
+import { DBPartInstance } from '@sofie-automation/corelib/dist/dataModel/PartInstance'
+import { protectString } from '@sofie-automation/corelib/dist/protectedString'
+
+function makeTestPart(id: string, expectedDuration: number): Partial<DBPart> {
+	return {
+		_id: protectString(`part_${id}`),
+		segmentId: protectString('segment_1'),
+		rundownId: protectString('rundown_1'),
+		untimed: false,
+		expectedDurationWithTransition: expectedDuration,
+	}
+}
+
+function makeTestPartInstance(id: string, partId: string, expectedDuration: number): Partial<DBPartInstance> {
+	return {
+		_id: protectString(`partInstance_${id}`),
+		part: makeTestPart(partId, expectedDuration) as DBPart,
+		rundownId: protectString('rundown_1'),
+		segmentId: protectString('segment_1'),
+		playlistActivationId: protectString('activation_1'),
+	}
+}
+
+describe('segmentTiming - calculateSegmentTiming', () => {
+	it('should use partInstance duration when available instead of original part duration', () => {
+		const parts = [makeTestPart('1', 5000), makeTestPart('2', 3000)]
+
+		// Create partInstances with modified durations
+		const partInstances = [makeTestPartInstance('1', '1', 6000), makeTestPartInstance('2', '2', 4000)]
+
+		const result = calculateSegmentTiming(undefined, partInstances as DBPartInstance[], parts as DBPart[])
+
+		// Should use the modified durations from partInstances (6000 + 4000), not the original (5000 + 3000)
+		expect(result.expectedDurationMs).toBe(10000)
+	})
+
+	it('should fall back to original part duration when no matching partInstance', () => {
+		const parts = [makeTestPart('1', 5000), makeTestPart('2', 3000), makeTestPart('3', 2000)]
+
+		// Only provide instances for parts 1 and 2, part 3 has no instance
+		const partInstances = [
+			makeTestPartInstance('1', '1', 6000), // modified from 5000
+			makeTestPartInstance('2', '2', 3000), // unchanged
+		]
+
+		const result = calculateSegmentTiming(undefined, partInstances as DBPartInstance[], parts as DBPart[])
+
+		// Should use: 6000 (instance) + 3000 (instance) + 2000 (original, no instance)
+		expect(result.expectedDurationMs).toBe(11000)
+	})
+})