refactoring

website/src/lib/data/example/example.test.ts

@@ -0,0 +1,48 @@
+import assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+import { computeExampleData, engineIsBuilt } from '$lib/scripts/example-statistics';
+import { exampleData } from '$lib/data/example/example-data';
+import { exampleStatistics } from '$lib/data/example';
+
+describe('exampleStatistics', () => {
+    it('has the statistics of the whole example for the whole range', () => {
+        const whole = exampleStatistics.slice(0, exampleStatistics.length - 1);
+        const global = exampleStatistics.global;
+        assert.ok(whole);
+        for (const key of [
+            'totalDistance',
+            'movingDistance',
+            'totalTime',
+            'movingTime',
+            'elevationGain',
+            'elevationLoss',
+            'startTime',
+            'endTime',
+            'totalSpeed',
+            'movingSpeed',
+        ] as const) {
+            assert.ok(Math.abs((whole[key] as number) - (global[key] as number)) < 1e-6, key);
+        }
+    });
+
+    it('has no speed for a range that does not last', () => {
+        const point = exampleStatistics.slice(20, 20);
+        assert.equal(point?.totalTime, 0);
+        assert.equal(point?.totalSpeed, undefined);
+        assert.equal(point?.movingSpeed, undefined);
+    });
+
+    it('has nothing for ranges that are not in the example', () => {
+        assert.equal(exampleStatistics.slice(5, 500), undefined);
+        assert.equal(exampleStatistics.slice(-1, 3), undefined);
+        assert.equal(exampleStatistics.slice(10, 5), undefined);
+    });
+
+    it(
+        'is what the engine computes (npm run generate:example if not)',
+        { skip: !engineIsBuilt() && 'the engine is not built' },
+        async () => {
+            assert.deepEqual(JSON.parse(JSON.stringify(await computeExampleData())), exampleData);
+        }
+    );
+});