chai

What is the difference between assert , expect and should , and when to use what? assert.equal(3, '3', '== coerces values to strings'); var foo = 'bar'; expect(foo).to.equal('bar'); foo.should.equal('bar'); Louis The differences are documented there . The three interfaces present different styles of performing assertions. Ultimately, they perform the same task. Some users prefer one style over the other. This being said, there are also a couple technical considerations worth highlighting: The assert and expect interfaces do not modify Object.prototype , whereas should does. So they are a

One of the things that I find frustrating about Mocha is that when tests fail, they don't give the actual error message of the failing line, Instead, they just end with Error: timeout of 2000ms exceeded. Ensure the done() callback is being called in this test. Take this test for example: describe("myTest", function() { it("should return valid JSON.", function(done) { api.myCall("valid value").then(function(result) { console.log(result); var resultObj = JSON.parse(result); assert.isFalse(resultObj.hasOwnProperty("error"), "result has an error"); done(); }); }); }); The output is: myTest {"error

In my Chai tests I often find myself wanting to use their assertions that are something like .to.be.empty , .to.be.true e.t.c., because I find them to be cleaner to read than .to.be.length(1) or .to.be.equal(true) . However, this breaks my linter (I'm using default Airbnb linting). I could use the // disable-eslint-line syntax, but then I'd have to add it to every single line that reads like that and that seems tedious. I've also read about the DirtyChai library, but that would require me to go back through my entire testing library adding brackets to them all which seems like something I

I am using node, mocha, and chai for my application. I want to test that my returned results data property is the same "type of object" as one of my model objects. (Very similiar to chai's instanceof). I just want to confirm that the two objects have the same sets of property names. I am specifically not interested in the actual values of the properties. Lets say I have the model Person like below. I want to check that my results.data has all the same properties as the expected model does. So in this case, Person which has a firstName and lastName. So if results.data.lastName and results.data

prior to posting this question, I tried to search in sqa stackexchange but I found no post about shallow and render there, so I hope someone can help me out here. When should I use shallow and render in testing react components? Based on the airbnb docs, I've made some opinions on the difference of the two: Since shallow is testing components as a unit , so it should be used for 'parent' components. (ex. Tables, Wrappers, etc.) Render is for child components. The reason I asked this question, is that I'm having a hard time to figure out which one I should use (though the docs say that they're