Javascript 如何在jasmine中比较两个具有浮点值的对象?
我需要在《茉莉花》中做一些期待,比如:Javascript 如何在jasmine中比较两个具有浮点值的对象?,javascript,object,floating-point,jasmine,Javascript,Object,Floating Point,Jasmine,我需要在《茉莉花》中做一些期待,比如: let realValue = callSomeMethod(); let expected = [{ total: 33, saved: 1.65 }]; expect(realValue).toEqual(expected); 但它失败了,信息是: Expect [ Object({ total: 33, saved: 1.6500000000000001 })] to equal [Object({ total: 33, save
let realValue = callSomeMethod();
let expected = [{
total: 33,
saved: 1.65
}];
expect(realValue).toEqual(expected);
但它失败了,信息是:
Expect [ Object({ total: 33, saved: 1.6500000000000001 })]
to equal [Object({ total: 33, saved: 1.65 })].
如何进行正确的检查?要关闭的
匹配器用于精确的数学比较:
expect(1.6500000000000001).toBeCloseTo(1.65, 2);
expect(1.6500000000000001).toBeCloseTo(1.65, 15);
expect(1.6500000000000001).not.toBeCloseTo(1.65, 16);
来源:如果某些属性是浮动属性,而某些属性不是:
let realValue = callSomeMethod();
let expectedFloat = {
saved: 1.65,
otherFloat: 6.44
}
let expectedOther = {
firstName: 'Paul',
total: 33,
};
let expected = {
...expectedFloat,
...expectedOther
}
let floatNames = Object.getOwnPropertyNames(expectedFloat);
const testFloatProperty = (name) => () => {
expect(realValue[name]).toBeCloseTo(expectedFloat[name], 3)
}
for (let i in floatNames) {
it('should be close to expected ' + floatNames[i], testFloatProperty(floatNames[i]));
}
it('should contain other expected props', function() {
expect(realValue).toEqual(jasmine.objectContaining(expectedOther))
})
我对jasmine了解不够,但在一般计算中,比较两个浮点数的精度应该通过测试某个阈值内的接近度来完成,即abs(realValue-expected)
toBeCloseTo对数字很有效。但是如果您想要断言一个具有20个属性的对象,并且一个属性是一个数字,那么您不能使用toEqual,需要执行20 expect。真遗憾。