Initial Commit

packages/geospatial/logistics/ports/src/distance/distance.test.ts

@@ -0,0 +1,44 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { distanceKm, distanceMetresRaw, distanceNm } from "./distance.js";
+
+const SINGAPORE = { latitude: 1.2644, longitude: 103.8198 };
+const ROTTERDAM = { latitude: 51.9, longitude: 4.49 };
+
+describe("distance helpers", () => {
+    it("distanceNm zero between identical coords", { timeout: 5000 }, () => {
+        expect(distanceNm(SINGAPORE, SINGAPORE)).toBe(0);
+    });
+
+    it("distanceKm zero between identical coords", { timeout: 5000 }, () => {
+        expect(distanceKm(SINGAPORE, SINGAPORE)).toBe(0);
+    });
+
+    it("distanceMetresRaw produces unrounded metres", { timeout: 5000 }, () => {
+        const raw = distanceMetresRaw(SINGAPORE, ROTTERDAM);
+        expect(raw).toBeGreaterThan(10_000_000);
+        expect(raw).toBeLessThan(12_000_000);
+    });
+
+    it("Singapore to Rotterdam great-circle is ~5800 nm", {
+        timeout: 5000,
+    }, () => {
+        const nm = distanceNm(SINGAPORE, ROTTERDAM);
+        expect(nm).toBeGreaterThan(5600);
+        expect(nm).toBeLessThan(6000);
+    });
+
+    it("Singapore to Rotterdam great-circle is ~10800 km", {
+        timeout: 5000,
+    }, () => {
+        const km = distanceKm(SINGAPORE, ROTTERDAM);
+        expect(km).toBeGreaterThan(10500);
+        expect(km).toBeLessThan(11200);
+    });
+
+    it("nm * 1.852 ≈ km within 1% tolerance", { timeout: 5000 }, () => {
+        const nm = distanceNm(SINGAPORE, ROTTERDAM);
+        const km = distanceKm(SINGAPORE, ROTTERDAM);
+        const expected = nm * 1.852;
+        expect(Math.abs(km - expected) / km).toBeLessThan(0.01);
+    });
+});