mathjs
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Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.
256 lines (207 loc) • 7.2 kB
JavaScript
// test import
var assert = require('assert');
var mathjs = require('../../index');
var approx = require('../../tools/approx');
describe('import', function() {
var math = null;
beforeEach(function() {
math = mathjs.create();
math.import({
myvalue: 42,
hello: function (name) {
return 'hello, ' + name + '!';
}
}, {override: true});
});
afterEach(function() {
math = null;
});
it('should import a custom member', function() {
assert.equal(math.myvalue * 2, 84);
assert.equal(math.hello('user'), 'hello, user!');
});
it('should not override existing functions', function() {
assert.throws(function () {math.import({myvalue: 10})},
/Error: Cannot import "myvalue": already exists/);
assert.equal(math.myvalue, 42);
});
it('should throw no errors when silent:true', function() {
math.import({myvalue: 10}, {silent: true});
assert.strictEqual(math.myvalue, 42);
});
it('should override existing functions if forced', function() {
math.import({myvalue: 10}, {override: true});
assert.strictEqual(math.myvalue, 10);
});
it('should parse the user defined members', function() {
if (math.parser) {
var parser = math.parser();
math.add(math.myvalue, 10);
parser.eval('myvalue + 10'); // 52
parser.eval('hello("user")'); // 'hello, user!'
}
});
var getSize = function (array) {
return array.length;
};
it('shouldn\'t wrap custom functions by default', function () {
math.import({ getSizeNotWrapped: getSize });
assert.strictEqual(math.getSizeNotWrapped([1,2,3]), 3);
assert.strictEqual(math.getSizeNotWrapped(math.matrix([1,2,3])), undefined);
});
it('should wrap custom functions if wrap = true', function () {
math.import({ getSizeWrapped: getSize }, { wrap: true});
assert.strictEqual(math.getSizeWrapped([1,2,3]), 3);
assert.strictEqual(math.getSizeWrapped(math.matrix([1,2,3])), 3);
});
it('wrapped imported functions should accept undefined and null', function () {
math.import({
isNull: function (obj) {
return obj === null;
}
}, { wrap: true });
assert.equal(math.isNull(null), true);
assert.equal(math.isNull(0), false);
math.import({
isUndefined: function (obj) {
return obj === undefined;
}
}, { wrap: true });
assert.equal(math.isUndefined(undefined), true);
assert.equal(math.isUndefined(0), false);
assert.equal(math.isUndefined(null), false);
});
it('should throw an error in case of wrong number of arguments', function () {
assert.throws (function () {math.import()}, /ArgumentsError/);
assert.throws (function () {math.import('', {}, 3)}, /ArgumentsError/);
});
it('should throw an error in case of wrong type of arguments', function () {
assert.throws(function () {math.import(2)}, /TypeError: Factory, Object, or Array expected/);
assert.throws(function () {math.import(function () {})}, /TypeError: Factory, Object, or Array expected/);
});
it('should ignore properties on Object', function () {
Object.prototype.foo = 'bar';
math.import({bar: 456});
assert(!math.hasOwnProperty('foo'));
assert(math.hasOwnProperty('bar'));
delete Object.prototype.foo;
});
it('should return the imported object', function () {
math.import({a: 24});
assert.deepEqual(math.a, 24);
math.import({pi: 24}, {silent: true});
approx.equal(math.pi, Math.PI); // pi was ignored
});
it('should import a boolean', function () {
math.import({a: true});
assert.strictEqual(math.a, true);
});
it('should merge typed functions with the same name', function () {
math.import({
'foo': math.typed('foo', {
'number': function (x) {
return 'foo(number)';
}
})
});
math.import({
'foo': math.typed('foo', {
'string': function (x) {
return 'foo(string)';
}
})
});
assert.deepEqual(Object.keys(math.foo.signatures).sort(), ['number', 'string']);
assert.equal(math.foo(2), 'foo(number)');
assert.equal(math.foo('bar'), 'foo(string)');
assert.throws(function () {
math.foo(new Date())
}, /TypeError: Unexpected type of argument in function foo/);
});
it('should override existing typed functions', function () {
math.import({
'foo': math.typed('foo', {
'Date': function (x) {
return 'foo(Date)';
}
})
});
assert.equal(math.foo(new Date()), 'foo(Date)');
math.import({
'foo': math.typed('foo', {
'string': function (x) {
return 'foo(string)';
}
})
}, {override: true});
assert.deepEqual(Object.keys(math.foo.signatures).sort(), ['string']);
assert.equal(math.foo('bar'), 'foo(string)');
assert.throws(function () {
math.foo(new Date())
}, /TypeError: Unexpected type of argument in function foo/);
assert.throws(function () {
math.foo(new Date())
}, /TypeError: Unexpected type of argument in function foo/);
});
it('should merge typed functions coming from a factory', function () {
math.import({
'foo': math.typed('foo', {
'number': function (x) {
return 'foo(number)';
}
})
});
math.import({
'name': 'foo',
'factory': function () {
return math.typed('foo', {
'string': function (x) {
return 'foo(string)';
}
})
}
});
assert.deepEqual(Object.keys(math.foo.signatures).sort(), ['number', 'string']);
assert.equal(math.foo(2), 'foo(number)');
assert.equal(math.foo('bar'), 'foo(string)');
assert.throws(function () {
math.foo(new Date())
}, /TypeError: Unexpected type of argument in function foo/);
});
it('should import a boolean', function () {
math.import({a: true});
assert.strictEqual(math.a, true);
});
it('should import a function with transform', function() {
function foo (text) {
return text.toLowerCase();
}
foo.transform = function foo(text) {
return text.toUpperCase();
};
math.import({foo: foo});
assert(math.hasOwnProperty('foo'));
assert.strictEqual(math.foo, foo);
assert(math.expression.transform.hasOwnProperty('foo'));
assert.strictEqual(math.expression.transform.foo, foo.transform);
});
it.skip('should import a factory with name', function () {
// TODO: unit test importing a factory
});
it.skip('should import a factory with path', function () {
// TODO: unit test importing a factory
});
it.skip('should import a factory without name', function () {
// TODO: unit test importing a factory
});
it.skip('should pass the namespace to a factory function', function () {
// TODO: unit test importing a factory
});
it.skip('should import an Array', function () {
// TODO: unit test importing an Array containing stuff
});
it('should LaTeX import', function () {
var expression = math.parse('import(object)');
assert.equal(expression.toTex(), '\\mathrm{import}\\left( object\\right)');
});
});