Implement bonus division

3 files changed, 65 insertions, 0 deletions

diff --git a/__tests__/dice.test.js b/__tests__/dice.test.js
index 375c9ad..9c03a48 100644
--- a/__tests__/dice.test.js
+++ b/__tests__/dice.test.js
@@ -9,6 +9,7 @@ const {
   bonusAdd,
   bonusSubtract,
   bonusMultiply,
+  bonusDivide,
   negative,
   explodeAbove,
   explodeUnder,
@@ -503,6 +504,46 @@ describe('bonusMultiply', () => {
   })
 })
 
+describe('bonusDivide', () => {
+  describe('1d20/3', () => {
+    const die = bonusDivide(d(constant(1), constant(20)), constant(3))
+    testDie(die, {
+      diceCount: 1,
+      average: {
+        average: 3.15
+      },
+      variance: {
+        variance: 3.73
+      },
+      bounds: {
+        low: 0,
+        high: 6,
+        expectLow: true,
+        expectHigh: true
+      }
+    })
+  })
+
+  describe('3d4/2', () => {
+    const die = bonusDivide(d(constant(3), constant(4)), constant(2))
+    testDie(die, {
+      diceCount: 3,
+      average: {
+        average: 3
+      },
+      variance: {
+        variance: 1.5
+      },
+      bounds: {
+        low: 0,
+        high: 6,
+        expectLow: true,
+        expectHigh: true
+      }
+    })
+  })
+})
+
 describe('negative', () => {
   describeBasicDie(1, 6, defaultNumberRolls, true)
   describeBasicDie(0, 6, defaultNumberRolls, true)
diff --git a/__tests__/lexer.test.js b/__tests__/lexer.test.js
index 31150bc..7124746 100644
--- a/__tests__/lexer.test.js
+++ b/__tests__/lexer.test.js
@@ -253,6 +253,18 @@ describe('lex', () => {
     })
   })
 
+  describe('bonusDivide', () => {
+    test('3d4/1', () => {
+      expect(lex('3d4/1')).toEqual([
+        { type: 'constant', value: 3 },
+        { type: 'd' },
+        { type: 'constant', value: 4 },
+        { type: 'divide' },
+        { type: 'constant', value: 1 }
+      ])
+    })
+  })
+
   describe('again', () => {
     test('6A3d6', () => {
       expect(lex('6A3d6')).toEqual([
diff --git a/__tests__/parser.test.js b/__tests__/parser.test.js
index 5580b4c..3c9f6ec 100644
--- a/__tests__/parser.test.js
+++ b/__tests__/parser.test.js
@@ -165,6 +165,18 @@ describe('parse', () => {
     })
   })
 
+  it('parses divisional bonuses', () => {
+    expect(parse('3d4/1')).toEqual({
+      type: 'bonusDivide',
+      left: {
+        type: 'd',
+        left: { type: 'constant', value: 3 },
+        right: { type: 'constant', value: 4 }
+      },
+      right: { type: 'constant', value: 1 }
+    })
+  })
+
   test('bonus binds stronger than addition', () => {
     expect(parse('2d6 + 2d6+2d6')).toEqual({
       type: 'add',