mathjs/test/function/combinatorics/bellNumbers.test.js
greenkeeper[bot] c5971b371a Update standard to the latest version 🚀 (#1226)
* chore(package): update standard to version 12.0.0

* update to new lint version with --fix

I believe this mainly adds whitespace to `{}`'s.

* Replace assert.equal with assert.strictEqual

This breaks a lot of tests which I will endevour to fix in the next
commits.

* Fix most errors due to assert.strictEquals

Some instances of `strictEquals` are replaced by `deepEquals`.
`toString` has been used to make some string comparisions explicit.
Tests will still fail untill #1236 and #1237 are fixed.

* Fix assertion erros due to -0

With node 10, assert.strictEqual no longer considers `0 === -0`.
I missed these first time round as I was using node 8.

* Put toString correct side of bracket

I was converting the constructor to a string rather
than the result of the computation. Oops.

* Fixed #1236: quantileSeq has inconsistant return

* Update package-lock

* Fixed #1237: norm sometimes returning a complex number instead of number

* Fix cli tests

* More changes for standardjs, and fixes in unit tests
2018-09-08 16:33:58 +02:00

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1.6 KiB
JavaScript

const assert = require('assert')
const math = require('../../../src/main')
const bellNumbers = math.bellNumbers
describe('bellNumbers', function () {
it('should calculate the number of partitions of a set', function () {
assert.strictEqual(bellNumbers(3), 5)
assert.strictEqual(bellNumbers(0), 1)
assert.strictEqual(bellNumbers(8), 4140)
})
it('should calculate the bellNumbers of n items with BigNumbers', function () {
assert.deepStrictEqual(bellNumbers(math.bignumber(2)), math.bignumber(2))
assert.deepStrictEqual(bellNumbers(math.bignumber(3)), math.bignumber(5))
})
it('should not work with non-integer and negative input', function () {
assert.throws(function () { bellNumbers(0.5) }, TypeError)
assert.throws(function () { bellNumbers(-1) }, TypeError)
assert.throws(function () { bellNumbers(math.bignumber(-3)) }, TypeError)
assert.throws(function () { bellNumbers(math.bignumber(3.5)) }, TypeError)
})
it('should throw an error in case of non-integer input', function () {
assert.throws(function () { bellNumbers(5.2) }, /Non-negative integer value expected/)
})
it('should throw an error in case of negative input', function () {
assert.throws(function () { bellNumbers(-2) }, /Non-negative integer value expected/)
})
it('should throw an error in case of wrong number or type of arguments', function () {
assert.throws(function () { bellNumbers(5, 3, 2) })
assert.throws(function () { bellNumbers(true, 'hello world') })
})
it('should LaTeX bellNumbers', function () {
const expression = math.parse('bellNumbers(3)')
assert.strictEqual(expression.toTex(), '\\mathrm{B}_{3}')
})
})