Initial

tests/unit/provenance.test.ts

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+import { describe, it, expect } from 'vitest';
+import { pointDirty, templateDirty, DEFAULT_FLIGHT_PARAMETERS } from '$domain';
+import type { FlightParameters, SavedPoint } from '$domain';
+
+const point: SavedPoint = { id: 1, name: 'p', lat: 62.5, lon: 129.5, alt: 100 };
+const paramsAt = (lat: number, lon: number, alt: number): FlightParameters => ({
+	...DEFAULT_FLIGHT_PARAMETERS,
+	launch_latitude: lat,
+	launch_longitude: lon,
+	launch_altitude: alt
+});
+
+describe('pointDirty', () => {
+	it('is clean when coordinates match the saved point', () => {
+		expect(pointDirty(paramsAt(62.5, 129.5, 100), point)).toBe(false);
+	});
+	it('is dirty when any coordinate diverges', () => {
+		expect(pointDirty(paramsAt(62.5001, 129.5, 100), point)).toBe(true);
+		expect(pointDirty(paramsAt(62.5, 129.5, 101), point)).toBe(true);
+	});
+});
+
+describe('templateDirty', () => {
+	it('is clean against an identical copy', () => {
+		const tpl = { ...DEFAULT_FLIGHT_PARAMETERS };
+		expect(templateDirty({ ...DEFAULT_FLIGHT_PARAMETERS }, tpl)).toBe(false);
+	});
+	it('is dirty when a parameter changes', () => {
+		const tpl = { ...DEFAULT_FLIGHT_PARAMETERS };
+		expect(templateDirty({ ...DEFAULT_FLIGHT_PARAMETERS, ascent_rate: 7 }, tpl)).toBe(true);
+	});
+});