mirror of
https://github.com/josdejong/mathjs.git
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94 lines
3.5 KiB
JavaScript
94 lines
3.5 KiB
JavaScript
import assert from 'assert'
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import approx from '../../../../tools/approx'
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import math from '../../../../src/bundleAny'
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const Complex = math.Complex
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const Unit = math.Unit
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const ResultSet = math.ResultSet
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describe('evaluate', function () {
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it('should evaluate expressions', function () {
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approx.equal(math.evaluate('(2+3)/4'), 1.25)
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assert.deepStrictEqual(math.evaluate('sqrt(-4)'), new Complex(0, 2))
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})
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it('should evaluate a list of expressions', function () {
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assert.deepStrictEqual(math.evaluate(['1+2', '3+4', '5+6']), [3, 7, 11])
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assert.deepStrictEqual(math.evaluate(['a=3', 'b=4', 'a*b']), [3, 4, 12])
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assert.deepStrictEqual(math.evaluate(math.matrix(['a=3', 'b=4', 'a*b'])), math.matrix([3, 4, 12]))
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assert.deepStrictEqual(math.evaluate(['a=3', 'b=4', 'a*b']), [3, 4, 12])
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})
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it('should evaluate a series of expressions', function () {
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assert.deepStrictEqual(math.evaluate('a=3\nb=4\na*b'), new ResultSet([3, 4, 12]))
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assert.deepStrictEqual(math.evaluate('f(x) = a * x; a=2; f(4)'), new ResultSet([8]))
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assert.deepStrictEqual(math.evaluate('b = 43; b * 4'), new ResultSet([172]))
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})
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it('should throw an error if wrong number of arguments', function () {
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assert.throws(function () { math.evaluate() }, /TypeError: Too few arguments/)
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assert.throws(function () { math.evaluate('', {}, 3) }, /TypeError: Too many arguments/)
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})
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it('should throw an error with a unit', function () {
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assert.throws(function () { math.evaluate(new Unit(5, 'cm')) }, /TypeError: Unexpected type of argument/)
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})
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it('should throw an error with a complex number', function () {
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assert.throws(function () { math.evaluate(new Complex(2, 3)) }, /TypeError: Unexpected type of argument/)
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})
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it('should evaluate a boolean', function () {
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// TODO: this is odd. Boolean is turned in to string and then evaluated
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assert.strictEqual(math.evaluate(true), true)
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})
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it('should handle the given scope', function () {
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let scope = {
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a: 3,
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b: 4
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}
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assert.deepStrictEqual(math.evaluate('a*b', scope), 12)
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assert.deepStrictEqual(math.evaluate('c=5', scope), 5)
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assert.deepStrictEqual(math.format(math.evaluate('f(x) = x^a', scope)), 'f(x)')
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assert.deepStrictEqual(Object.keys(scope).length, 4)
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assert.deepStrictEqual(scope.a, 3)
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assert.deepStrictEqual(scope.b, 4)
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assert.deepStrictEqual(scope.c, 5)
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assert.deepStrictEqual(typeof scope.f, 'function')
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assert.strictEqual(scope.f(3), 27)
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scope.a = 2
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assert.strictEqual(scope.f(3), 9)
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scope.hello = function (name) {
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return 'hello, ' + name + '!'
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}
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assert.deepStrictEqual(math.evaluate('hello("jos")', scope), 'hello, jos!')
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})
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it('should LaTeX evaluate', function () {
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const expr1 = math.parse('evaluate(expr)')
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const expr2 = math.parse('evaluate(expr,scope)')
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assert.strictEqual(expr1.toTex(), '\\mathrm{evaluate}\\left( expr\\right)')
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assert.strictEqual(expr2.toTex(), '\\mathrm{evaluate}\\left( expr, scope\\right)')
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})
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it('should still allow using the deprecated function math.evaluate', () => {
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// deprecated in v6.0.0. Clean up some day
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const warnOriginal = console.warn
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const logs = []
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console.warn = (...args) => logs.push(args)
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assert.strictEqual(math.eval('2+3'), 5)
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// Note that the following assertion will fail if math.evaluate is already used in a previous unit test
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assert.deepStrictEqual(logs, [
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['Warning:', 'Function "eval" has been renamed to "evaluate" in v6.0.0, please use the new function instead.']
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])
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console.warn = warnOriginal
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})
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})
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