castle: a table that fits a phone

src/apps/castle/__tests__/rules.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest'
-import { cardsOf, describeEnding, describeLastPlay, describePile, headlineOf, rowInPlay, standingOf, toggleSelection } from '../rules'
+import { cardsOf, describeEnding, describeLastPlay, describePile, enteredSince, headlineOf, rowInPlay, standingOf, toggleSelection } from '../rules'
 import type { CastlePlayer, CastleView } from '../wire'
 
 const seat = (over: Partial<CastlePlayer> = {}): CastlePlayer => ({
@@ -82,13 +82,11 @@ describe('describeLastPlay', () => {
 })
 
 describe('describePile', () => {
-  it('names the price the next play must match', () => {
-    expect(describePile(view())).toBe('Empty pile: anything goes')
-    expect(describePile(view({ run: [{ rank: '8', suit: '♥' }], pileCount: 3 }))).toBe(
-      '8♥ on top: play one or more of 8 or higher'
-    )
+  it('names the price the next play must match, and nothing the table already shows', () => {
+    expect(describePile(view())).toBe('Anything goes')
+    expect(describePile(view({ run: [{ rank: '8', suit: '♥' }], pileCount: 3 }))).toBe('Play 8 or higher')
     expect(describePile(view({ run: [{ rank: '8', suit: '♠' }, { rank: '8', suit: '♥' }], pileCount: 3 }))).toBe(
-      'two 8s on top: play two or more of 8 or higher'
+      'Play two or more, 8 or higher'
     )
     // A queen on a queen: two show, but one king answers, since the
     // count to match is the last play's.
@@ -100,11 +98,11 @@ describe('describePile', () => {
           lastPlay: { playerId: 'bob', cards: [{ rank: 'Q', suit: '♥' }], burned: false, pickedUp: false }
         })
       )
-    ).toBe('two Qs on top: play one or more of Q or higher')
+    ).toBe('Play Q or higher')
     // Three 3s must not read as arithmetic.
     expect(
       describePile(view({ run: [{ rank: '3', suit: '♠' }, { rank: '3', suit: '♦' }, { rank: '3', suit: '♥' }], pileCount: 3 }))
-    ).toBe('three 3s on top: play three or more of 3 or higher')
+    ).toBe('Play three or more, 3 or higher')
   })
 })
 
@@ -133,3 +131,19 @@ describe('standingOf and headlineOf', () => {
     expect(headlineOf({ finished: [] }, 'alice')).toBe('The table broke up')
   })
 })
+
+describe('enteredSince', () => {
+  it('names the cards that were not there, counting duplicates as a multiset', () => {
+    const hand = [
+      { rank: 'K', suit: '♣' },
+      { rank: 'K', suit: '♣' },
+      { rank: '3', suit: '♦' }
+    ]
+    // One K♣ was there: the second is new, the first is not.
+    expect(enteredSince(['K♣'], hand)).toEqual([1, 2])
+    expect(enteredSince(['K♣', 'K♣', '3♦'], hand)).toEqual([])
+    expect(enteredSince([], hand)).toEqual([0, 1, 2])
+    // Order changed, nothing arrived.
+    expect(enteredSince(['3♦', 'K♣', 'K♣'], hand)).toEqual([])
+  })
+})