test(2020-day-13): stub in tests for part 2

Author: developher-net

2020/day-13/busSchedules.js

@@ -22,5 +22,6 @@ const findNext = ({ time, schedule }) => {
 
 module.exports = {
   parseSchedule,
-  findNext
+  findNext,
+  findSequentialTime: () => {}
 }

2020/day-13/busSchedules.test.js

@@ -1,6 +1,6 @@
 /* eslint-env mocha */
 const { expect } = require('chai')
-const { parseSchedule, findNext } = require('./busSchedules')
+const { parseSchedule, findNext, findSequentialTime } = require('./busSchedules')
 
 const testData = {
   time: 939,
@@ -27,4 +27,16 @@ describe('--- Day 13: Shuttle Search ---', () => {
       })
     })
   })
+  describe('Part 2', () => {
+    describe('findSequentialTime', () => {
+      it('finds a sequential time where the busses all depart sequentially', () => {
+        expect(findSequentialTime('7,13,x,x,59,x,31,19')).to.equal(1068781)
+        expect(findSequentialTime('17,x,13,19')).to.equal(3417)
+        expect(findSequentialTime('67,7,59,61')).to.equal(754018)
+        expect(findSequentialTime('67,x,7,59,61')).to.equal(779210)
+        expect(findSequentialTime('67,7,x,59,61')).to.equal(1261476)
+        expect(findSequentialTime('1789,37,47,1889')).to.equal(1202161486)
+      })
+    })
+  })
 })