Initial

tests/unit/export.test.ts

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+import { describe, it, expect } from 'vitest';
+import { toGpx, toKml, toCsv, parsePrediction, EXPORT_MIME, exportPrediction } 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 }
+		]
+	}
+];
+const prediction = parsePrediction(stages);
+
+describe('toGpx', () => {
+	it('emits one trkpt per sample with elevation and time', () => {
+		const gpx = toGpx(prediction, 'Flight 1');
+		expect(gpx).toContain('<gpx version="1.1"');
+		expect(gpx.match(/<trkpt /g)).toHaveLength(4);
+		expect(gpx).toContain('lat="62.000000" lon="129.000000"');
+		expect(gpx).toContain('<ele>30000.0</ele>');
+		expect(gpx).toContain('<time>2026-01-01T00:00:00.000Z</time>');
+	});
+
+	it('escapes the name so a quote cannot break the XML', () => {
+		expect(toGpx(prediction, 'A & <B>')).toContain('A &amp; &lt;B&gt;');
+	});
+});
+
+describe('toKml', () => {
+	it('orders coordinates longitude-first and marks the key points', () => {
+		const kml = toKml(prediction);
+		expect(kml).toContain('<kml xmlns="http://www.opengis.net/kml/2.2">');
+		// lon,lat,alt — the opposite order to GPX.
+		expect(kml).toContain('129.000000,62.000000,0.0');
+		expect(kml).toContain('<name>Launch</name>');
+		expect(kml).toContain('<name>Burst</name>');
+		expect(kml).toContain('<name>Landing</name>');
+	});
+});
+
+describe('toCsv', () => {
+	it('writes a header plus one row per sample', () => {
+		const lines = toCsv(prediction).split('\n');
+		expect(lines[0]).toBe('datetime_utc,latitude,longitude,altitude_m');
+		expect(lines).toHaveLength(5);
+		expect(lines[1]).toBe('2026-01-01T00:00:00.000Z,62.000000,129.000000,0.0');
+	});
+});
+
+describe('exportPrediction', () => {
+	it('dispatches by format and exposes a mime type for each', () => {
+		expect(exportPrediction(prediction, 'gpx')).toContain('<gpx');
+		expect(exportPrediction(prediction, 'kml')).toContain('<kml');
+		expect(exportPrediction(prediction, 'csv')).toContain('datetime_utc');
+		expect(Object.keys(EXPORT_MIME).sort()).toEqual(['csv', 'gpx', 'kml']);
+	});
+});