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105 lines
3.7 KiB
JavaScript
105 lines
3.7 KiB
JavaScript
// test abs
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var assert = require('assert');
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var math = require('../../../index');
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describe('abs', function () {
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it('should return the abs value of a boolean', function () {
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assert.strictEqual(math.abs(true), 1);
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assert.strictEqual(math.abs(false), 0);
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});
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it('should return the abs value of null', function () {
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assert.strictEqual(math.abs(null), 0);
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});
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it('should return the abs value of a number', function () {
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assert.strictEqual(math.abs(-4.2), 4.2);
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assert.strictEqual(math.abs(-3.5), 3.5);
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assert.strictEqual(math.abs(100), 100);
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assert.strictEqual(math.abs(0), 0);
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});
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it('should return the absolute value of a big number', function () {
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assert.deepEqual(math.abs(math.bignumber(-2.3)), math.bignumber(2.3));
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assert.deepEqual(math.abs(math.bignumber('5e500')), math.bignumber('5e500'));
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assert.deepEqual(math.abs(math.bignumber('-5e500')), math.bignumber('5e500'));
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});
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it('should return the absolute value of a complex number', function () {
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assert.equal(math.abs(math.complex(3, -4)), 5);
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assert.equal(math.abs(math.complex(1e200, -4e200)), 4.12310562561766e+200);
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});
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it('should return the absolute value of a fraction', function () {
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var a = math.fraction('-1/3');
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assert.equal(math.abs(a).toString(), '0.(3)');
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assert.equal(a.toString(), '-0.(3)');
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assert.equal(math.abs(math.fraction('1/3')).toString(), '0.(3)');
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});
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it('should convert a string to a number', function() {
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assert.strictEqual(math.abs('-2'), 2);
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});
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it('should return the absolute value of all elements in an Array', function () {
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var a1 = math.abs([1,-2,3]);
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assert.ok(Array.isArray(a1));
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assert.deepEqual(a1, [1,2,3]);
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a1 = math.abs([-2,-1,0,1,2]);
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assert.ok(Array.isArray(a1));
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assert.deepEqual(a1, [2,1,0,1,2]);
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});
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it('should return the absolute number of a complex number with zero', function () {
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assert.equal(math.abs(math.complex(1, 0)), 1);
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assert.equal(math.abs(math.complex(0, 1)), 1);
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assert.equal(math.abs(math.complex(0, 0)), 0);
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assert.equal(math.abs(math.complex(-1, 0)), 1);
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assert.equal(math.abs(math.complex(0, -1)), 1);
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});
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it('should return the absolute value of all elements in a matrix', function () {
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var a1 = math.abs(math.matrix([1,-2,3]));
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assert.ok(a1 instanceof math.type.Matrix);
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assert.deepEqual(a1.size(), [3]);
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assert.deepEqual(a1.valueOf(), [1,2,3]);
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a1 = math.abs(math.matrix([-2,-1,0,1,2]));
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assert.ok(a1 instanceof math.type.Matrix);
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assert.deepEqual(a1.size(), [5]);
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assert.deepEqual(a1.valueOf(), [2,1,0,1,2])
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});
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it('should return the absolute value of a unit', function () {
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var u = math.abs(math.unit('5 m'));
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assert.equal(u.toString(), '5 m');
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u = math.abs(math.unit('-5 m'));
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assert.equal(u.toString(), '5 m');
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u = math.abs(math.unit('-283.15 degC'));
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assert.equal(u.toString(), '-263.15 degC');
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u = math.abs(math.unit(math.fraction(2,3), 'm'));
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assert.equal(u.toString(), '2/3 m');
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u = math.abs(math.unit(math.complex(-4, 3), 'in'));
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assert.equal(u.toString(), '5 in');
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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.abs()}, /TypeError: Too few arguments/);
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assert.throws(function () {math.abs(1, 2)}, /TypeError: Too many arguments/);
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});
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it('should throw an error in case of unsupported types', function () {
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assert.throws(function () {math.abs(new Date());}, /TypeError: Unexpected type of argument/);
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assert.throws(function () {math.abs(undefined);}, /TypeError: Unexpected type of argument/);
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});
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it('should LaTeX abs', function () {
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var expression = math.parse('abs(-1)');
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assert.equal(expression.toTex(),'\\left|-1\\right|');
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});
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});
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