Restrict routing to maritime ports

src/maritime.test.ts

@@ -0,0 +1,18 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import { isMaritimePort } from './maritime.js'
+
+test('accepts curated coastal LOCODE ports', () => {
+  assert.equal(isMaritimePort({ locode: 'NGLAG' }), true)
+  assert.equal(isMaritimePort({ locode: 'CDBNW' }), true)
+})
+
+test('rejects inland ports even when UN/LOCODE function 1 is present', () => {
+  assert.equal(isMaritimePort({ locode: 'CMGOU', function_code: '1-34----' }), false)
+  assert.equal(isMaritimePort({ locode: 'CGOYO', function_code: '1-3-----' }), false)
+})
+
+test('accepts an explicitly curated database record', () => {
+  assert.equal(isMaritimePort({ locode: 'CUSTOM', is_maritime_port: true }), true)
+})