Initial

tests/unit/prediction.test.ts

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+import { describe, it, expect } from 'vitest';
+import { parsePrediction } from '$domain';
+import type { PredictionStage } from '$domain';
+
+const stages: PredictionStage[] = [
+	{
+		stage: 'ascent',
+		trajectory: [
+			{ altitude: 0, datetime: '2026-01-01T00:00:00Z', latitude: 62.0, longitude: 129.0 },
+			{ altitude: 30000, datetime: '2026-01-01T01:00:00Z', latitude: 62.1, longitude: 129.2 }
+		]
+	},
+	{
+		stage: 'descent',
+		trajectory: [
+			{ altitude: 30000, datetime: '2026-01-01T01:00:00Z', latitude: 62.1, longitude: 129.2 },
+			{ altitude: 0, datetime: '2026-01-01T01:30:00Z', latitude: 62.05, longitude: 129.4 }
+		]
+	}
+];
+
+describe('parsePrediction', () => {
+	it('flattens ascent + descent into one flight_path', () => {
+		const p = parsePrediction(stages);
+		expect(p.flight_path).toHaveLength(4);
+		expect(p.timestamps).toHaveLength(4);
+	});
+
+	it('derives launch, burst, and landing points', () => {
+		const p = parsePrediction(stages);
+		expect(p.launch.latlng.lat).toBe(62.0); // ascent[0]
+		expect(p.burst.latlng.alt).toBe(30000); // descent[0]
+		expect(p.landing.latlng.lat).toBe(62.05); // descent[last]
+		expect(p.flight_time).toBe(90 * 60); // 90 minutes, in seconds
+		expect(p.profile).toBe('standard_profile');
+	});
+
+	it('throws when there are fewer than two stages', () => {
+		expect(() => parsePrediction([stages[0]])).toThrow();
+	});
+});