Expected [ ] to be [ ] Jasmine, how to check empty array

javascript arrays angular unit-testing jasmine

toBe doesn't check the contents of the array, it only checks if the references are the same.

expect([1]).toBe([1]) will fail because the references are different.

You should use toEqual, which has some smarts to check the array contents as opposed to just doing a reference comparison.

javascript arrays angular unit-testing jasmine

Use toHaveSize matcher:

expect(array).toHaveSize(0);

It's strongly recommended to use because the error messages you get with it are much better (e.g. Error: Expected array to have size 0)

Coming with Jasmine 3.6: release docs

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