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In my case I was comparing the array of objects (basically a model class). Similarly to other colleagues I had this issue with an Array comparison, I was basically testing a function that got the largest string in an array, additionally it should return an array if more than 1 of those strings matched the largest length possible. If you preorder a special airline meal (e.g. A limit involving the quotient of two sums. The "serializes to the same string" error happens in Jest when you try to expect an object to match a certain value, but you are using the wrong matcher. ", I have no idea what's going on here, but I'm pretty sure it shouldn't be happening. Outlook VBA to Sort Inbox by date, then find most recent email with Do not hesitate to share your response here to help other visitors like you. An example of data being processed may be a unique identifier stored in a cookie. Web Test throwing serializes to the same string error Copied to clipboard. Making statements based on opinion; back them up with references or personal experience. expected "test" received serializes to the same string. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? The objects had functions defined and was the reason toMatchObject failed. Just had this problem when tried to compare arrays where in one array there was an element with -1 index set (imagine any other key to be set except numbers from 0 to N). What is the difference between "let" and "var"? Continue with Recommended Cookies. This happens because each object reference is different in JavaScript. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. By making a purchase through them, we earn a commission at no extra cost to you. Sorry if I missed some message that was describing the issue already, but I've created a sandbox with reproduction for you: https://codesandbox.io/s/nameless-violet-vk4gn, See the src/index.test.js source and "Tests" tab for the results. deep equality check failing message is very different compare to Jest So, in my case the type caused to fail. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Understanding TypeScript object serialization - LogRocket Blog