test(2020-day-12): stub out tests for moving the ferry

developher-net · developher-net · commit a136ce79da8a · 2020-12-21T00:05:51.000-08:00
diff --git a/2020/day-12/ferry.js b/2020/day-12/ferry.js
@@ -0,0 +1,12 @@
+const move = () => {
+  return
+}
+
+const route = () => {
+  return
+}
+
+module.exports = {
+  move,
+  route
+}
diff --git a/2020/day-12/ferry.test.js b/2020/day-12/ferry.test.js
@@ -0,0 +1,77 @@
+/* eslint-env mocha */
+const { expect } = require('chai')
+const { distance } = require('../../2018/day-06')
+const { move, route } = require('./ferry')
+
+describe('--- Day 11: Seating System ---', () => {
+  describe('Part 1', () => {
+    describe('move()', () => {
+      let origin
+
+      beforeEach(() => {
+        origin = {
+          x: 0,
+          y: 0,
+          d: 90 // Starting direction is east
+        }
+      })
+      it('can move North without turning', () => {
+        const command = 'N5'
+        expect(
+          move({ position: origin, command })
+        ).to.deep.equal({ x: 0, y: 5, d: 90 })
+      })
+      it('can move South without turning', () => {
+        const command = 'S5'
+        expect(
+          move({ position: origin, command })
+        ).to.deep.equal({ x: 0, y: -5, d: 90 })
+      })
+      it('can move East without turning', () => {
+        const command = 'E5'
+        expect(
+          move({ position: origin, command })
+        ).to.deep.equal({ x: 5, y: 0, d: 90 })
+      })
+      it('can move West without turning', () => {
+        const command = 'W5'
+        expect(
+          move({ position: origin, command })
+        ).to.deep.equal({ x: -5, y: 0, d: 90 })
+      })
+      it('can turn left (counterclockwise) without moving', () => {
+        const command = 'L90'
+        expect(
+          move({ position: origin, command })
+        ).to.deep.equal({ x: 0, y: 0, d: 0 })
+      })
+      it('can turn right (clockwise) without moving', () => {
+        const command = 'R90'
+        expect(
+          move({ position: origin, command })
+        ).to.deep.equal({ x: 0, y: 0, d: 180 })
+      })
+      it('can move forward', () => {
+        const command = 'F10'
+        expect(
+          move({ position: origin, command })
+        ).to.deep.equal({ x: 10, y: 0, d: 90 })
+      })
+    })
+    describe('route()', () => {
+      it('can follow a list of instructions', () => {
+        const instructions = [
+          'F10',
+          'N3',
+          'F7',
+          'R90',
+          'F11'
+        ]
+        const result = route({ instructions })
+        expect(result)
+          .to.deep.equal({ x: 17, y: -8, d: 180 })
+        expect(distance(result.x, result.y)).to.equal(25)
+      })
+    })
+  })
+})
