parse line.fahrtNr, adapt tests ✅, adapt docs 📝

docs/departures.md

@@ -86,6 +86,7 @@ The response may look like this:
 	line: {
 		type: 'line',
 		id: '18299',
+		fahrtNr: '12345',
 		mode: 'train',
 		product: 'suburban',
 		public: true,
@@ -113,6 +114,7 @@ The response may look like this:
 	line: {
 		type: 'line',
 		id: '16441',
+		fahrtNr: '54321',
 		mode: 'train',
 		product: 'suburban',
 		public: true,
@@ -137,6 +139,7 @@ The response may look like this:
 	line: {
 		type: 'line',
 		id: '19494',
+		fahrtNr: '11111',
 		mode: 'train',
 		product: 'subway',
 		public: true,

docs/journeys.md

@@ -139,6 +139,7 @@ The response may look like this:
 			line: {
 				type: 'line',
 				id: '16845',
+				fahrtNr: '12345',
 				name: 'S7',
 				public: true,
 				mode: 'train',

docs/radar.md

@@ -50,6 +50,7 @@ The response may look like this:
 	line: {
 		type: 'line',
 		id: 's9',
+		fahrtNr: '12345',
 		name: 'S9',
 		public: true,
 		mode: 'train',
@@ -122,6 +123,7 @@ The response may look like this:
 	line: {
 		type: 'line',
 		id: 'm2',
+		fahrtNr: '54321',
 		name: 'M2',
 		public: true,
 		mode: 'train',

docs/trip.md

@@ -101,6 +101,7 @@ The response looked like this:
 	line: {
 		type: 'line',
 		id: '18299',
+		fahrtNr: '12345',
 		name: 'S9',
 		public: true,
 		mode: 'train',

parse/line.js

@@ -15,6 +15,7 @@ const createParseLine = (profile, opt, {operators}) => {
 		const res = {
 			type: 'line',
 			id: null,
+			fahrtNr: p.prodCtx && p.prodCtx.num || null,
 			name: p.line || p.name,
 			public: true
 		}

test/lib/validators.js

@@ -82,6 +82,10 @@ const createValidateLine = (cfg) => {
 
 	const validateLine = (val, line, name = 'line') => {
 		defaultValidators.line(val, line, name)
+
+		a.strictEqual(typeof line.fahrtNr, 'string', name + ' must be string')
+		a.ok(line.fahrtNr, name + ' must not be empty')
+
 		a.ok(validLineModes.includes(line.mode), name + '.mode is invalid')
 	}
 	return validateLine