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-rw-r--r--__tests__/dice.test.js26
1 files changed, 16 insertions, 10 deletions
diff --git a/__tests__/dice.test.js b/__tests__/dice.test.js
index 275e0a9..ea4d415 100644
--- a/__tests__/dice.test.js
+++ b/__tests__/dice.test.js
@@ -1,16 +1,22 @@
const { d, add } = require('../src/dice.js')
const defaultNumberRolls = 500
+const defaultError = 0.2
+
+const isWithinError = (value, expected, error) => {
+ const margin = expected * error
+ return value >= expected - margin && value <= expected + margin
+}
expect.extend({
- toBeOnAverage(received, expected, margin = 0.5) {
+ toBeOnAverage(received, expected, error = defaultError) {
const average = received.reduce(plus) / received.length
- const pass = average > expected - margin && average < expected + margin
+ const pass = isWithinError(average, expected, error)
return {
pass,
message: () => (
- `expected average to${pass ? ' not ' : ' '}be around ${expected} (margin: ${margin}), got ${average}`
+ `expected average to${pass ? ' not ' : ' '}be around ${expected} (error: ${error}%), got ${average}`
)
}
},
@@ -38,16 +44,16 @@ expect.extend({
)
}
},
- toHaveVariance(received, expected, margin = 0.5) {
+ toHaveVariance(received, expected, error = defaultError) {
const average = received.reduce(plus) / received.length
const variance = received.map((value) => (Math.pow(value - average, 2)))
.reduce(plus) / (received.length - 1)
- const pass = variance > expected - margin && variance < expected + margin
+ const pass = isWithinError(variance, expected, error)
return {
pass,
message: () => (
- `expected variance to${pass ? ' not ' : ' '}be around ${expected} (margin: ${margin}), got ${variance}`
+ `expected variance to${pass ? ' not ' : ' '}be around ${expected} (error: ${error}%), got ${variance}`
)
}
}
@@ -78,18 +84,18 @@ const testDie = (die, testSpecs, numberRolls = defaultNumberRolls) => {
}
if ('average' in testSpecs) {
- let { average, margin } = testSpecs.average
+ let { average, error } = testSpecs.average
it(`has an expected value of ${average}`, () => {
- expect(rolls).toBeOnAverage(average, margin)
+ expect(rolls).toBeOnAverage(average, error)
})
}
if ('variance' in testSpecs) {
- let { variance, margin } = testSpecs.variance
+ let { variance, error } = testSpecs.variance
it(`has a variance of ${variance}`, () => {
- expect(rolls).toHaveVariance(variance, margin)
+ expect(rolls).toHaveVariance(variance, error)
})
}