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55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
var assert = require('assert'),
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error = require('../../../lib/error/index'),
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math = require('../../../index');
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describe('im', function() {
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it('should return the imaginary part of a complex number', function() {
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assert.equal(math.im(math.complex(2,3)), 3);
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assert.equal(math.im(math.complex(-2,-3)), -3);
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assert.equal(math.im(math.i), 1);
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});
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it('should return the imaginary part of a real number', function() {
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assert.equal(math.im(2), 0);
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});
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it('should return the imaginary part of a big number', function() {
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assert.deepEqual(math.im(math.bignumber(2)), math.bignumber(0));
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});
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it('should return the imaginary part of a boolean', function() {
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assert.equal(math.im(true), 0);
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assert.equal(math.im(false), 0);
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});
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it('should return the imaginary part of null', function() {
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assert.equal(math.im(null), 0);
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});
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it('should return the imaginary part of a string', function() {
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assert.equal(math.im('string'), 0);
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});
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it('should return the imaginary part of a boolean', function() {
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assert.equal(math.im(true), 0);
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assert.equal(math.im(false), 0);
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});
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it('should return the imaginary part for each element in a matrix', function() {
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assert.deepEqual(math.im([2, math.complex('3-6i')]), [0, -6]);
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assert.deepEqual(math.im(math.matrix([2, math.complex('3-6i')])).valueOf(), [0, -6]);
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});
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it('should throw an error in case of invalid number of arguments', function() {
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assert.throws(function () {math.im()}, error.ArgumentsError);
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assert.throws(function () {math.im(1, 2)}, error.ArgumentsError);
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});
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it('should LaTeX im', function () {
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var expression = math.parse('im(1+i)');
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assert.equal(expression.toTex(), '\\Im\\left\\lbrace{{1} + {{i}}}\\right\\rbrace');
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});
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});
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