From 13e482fefb3090645a941a643c73eadcbf0a1a34 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Wed, 30 Aug 2017 18:27:55 -0400
Subject: Implement division

---
 __tests__/dice.test.js   | 22 ++++++++++++++++++++++
 __tests__/lexer.test.js  | 24 ++++++++++++++++++++++++
 __tests__/parser.test.js | 16 ++++++++++++++++
 3 files changed, 62 insertions(+)

(limited to '__tests__')

diff --git a/__tests__/dice.test.js b/__tests__/dice.test.js
index 4e89031..d397d4c 100644
--- a/__tests__/dice.test.js
+++ b/__tests__/dice.test.js
@@ -5,6 +5,7 @@ const {
   add,
   subtract,
   multiply,
+  divide,
   bonusAdd,
   bonusSubtract,
   negative,
@@ -338,6 +339,27 @@ describe('multiply', () => {
   })
 })
 
+describe('divide', () => {
+  describe('1d8 / 2', () => {
+    const die = divide(d(constant(1), constant(8)), constant(2))
+    testDie(die, {
+      diceCount: 1,
+      average: {
+        average: 2
+      },
+      variance: {
+        variance: 1.5
+      },
+      bounds: {
+        low: 0,
+        high: 4,
+        expectLow: true,
+        expectHigh: true
+      }
+    })
+  })
+})
+
 
 describe('bonusAdd', () => {
   describe('1d20+3', () => {
diff --git a/__tests__/lexer.test.js b/__tests__/lexer.test.js
index db7ab50..0c615d5 100644
--- a/__tests__/lexer.test.js
+++ b/__tests__/lexer.test.js
@@ -121,6 +121,30 @@ describe('lex', () => {
     })
   })
 
+  describe('lexes division', () => {
+    it('1d6 / 1d4', () => {
+      expect(lex('1d6 / 1d4')).toEqual([
+        { type: 'constant', value: 1 },
+        { type: 'd' },
+        { type: 'constant', value: 6 },
+        { type: 'bigDivide' },
+        { type: 'constant', value: 1 },
+        { type: 'd' },
+        { type: 'constant', value: 4 }
+      ])
+    })
+
+    it('2d17 / 4', () => {
+      expect(lex('2d17 / 4')).toEqual([
+        { type: 'constant', value: 2 },
+        { type: 'd' },
+        { type: 'constant', value: 17 },
+        { type: 'bigDivide' },
+        { type: 'constant', value: 4 }
+      ])
+    })
+  })
+
   describe('lexes parentheses', () => {
     it('(1d6)d6', () => {
       expect(lex('(1d6)d6')).toEqual([
diff --git a/__tests__/parser.test.js b/__tests__/parser.test.js
index 5d4288d..bef11c5 100644
--- a/__tests__/parser.test.js
+++ b/__tests__/parser.test.js
@@ -113,6 +113,22 @@ describe('parse', () => {
     })
   })
 
+  it('parses dice division', () => {
+    expect(parse('1d6 / 2d8')).toEqual({
+      type: 'divide',
+      left: {
+        type: 'd',
+        left: { type: 'constant', value: 1 },
+        right: { type: 'constant', value: 6 }
+      },
+      right: {
+        type: 'd',
+        left: { type: 'constant', value: 2 },
+        right: { type: 'constant', value: 8 }
+      }
+    })
+  })
+
   it('parses additive bonuses', () => {
     expect(parse('3d4+1')).toEqual({
       type: 'bonusAdd',
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