Create failing explode tests

2 files changed, 54 insertions, 1 deletions

diff --git a/__tests__/dice.test.js b/__tests__/dice.test.js
index 527db81..1274b3d 100644
--- a/__tests__/dice.test.js
+++ b/__tests__/dice.test.js
@@ -1,4 +1,12 @@
-const { pool, constant, d, add, subtract, negative } = require('../src/dice.js')
+const {
+  pool,
+  constant,
+  d,
+  add,
+  subtract,
+  negative,
+  explode
+} = require('../src/dice.js')
 
 const defaultNumberRolls = 500
 const defaultError = 0.2
@@ -332,3 +340,41 @@ describe('compound dice', () => {
     testDie(die, basicDieTestSpecs(2, 2))
   })
 })
+
+describe('exploding dice', () => {
+  describe('6E1d6', () => {
+    const die = explode(constant(6), d(constant(1), constant(6)))
+    testDie(die, {
+      diceCount: 1,
+      average: {
+        average: 4.2
+      },
+      variance: {
+        variance: 10.64
+      },
+      bounds: {
+        low: 1,
+        expectLow: true,
+        high: Infinity
+      }
+    })
+  })
+
+  describe('6E2d6', () => {
+    const die = explode(constant(6), d(constant(2), constant(6)))
+    testDie(die, {
+      diceCount: 2,
+      average: {
+        average: 2 * 4.2
+      },
+      variance: {
+        variance: 2 * 10.64
+      },
+      bounds: {
+        low: 2,
+        expectLow: true,
+        high: Infinity
+      }
+    })
+  })
+})
diff --git a/src/dice.js b/src/dice.js
index 1587eef..cbc7325 100644
--- a/src/dice.js
+++ b/src/dice.js
@@ -41,6 +41,12 @@ const subtract = (die1, die2) => {
   }
 }
 
+const explode = (die1, die2) => {
+  return () => {
+    return die1()
+  }
+}
+
 exports.pool = pool
 exports.roll = roll
 exports.constant = constant
@@ -48,3 +54,4 @@ exports.d = d
 exports.add = add
 exports.subtract = subtract
 exports.negative = negative
+exports.explode = explode