chai test array equality doesn t work as expected

Question

Why does the following fail   expect  0 0   to equal  0 0      and what is the right way to test that

User · Answer

Try to use deep Equal  It will compare nested arrays as well as nested Json   expect   foo   bar     to deep equal   foo   bar        Please refer to main documentation site

User · Answer

import chai from  chai   const arr1    2  1   const arr2    2  1   chai expect arr1  to eql arr2      Will pass   eql  is data compare instead of object compare

User · Answer

This is how to use chai to deeply test associative arrays   I had an issue trying to assert that two associative arrays were equal  I know that these shouldn t really be used in javascript but I was writing unit tests around legacy code which returns a reference to an associative array   -   I did it by defining the variable as an object  not array  prior to my function call   var myAssocArray            not    var expectedAssocArray           not     expectedAssocArray  myKey      something   expectedAssocArray  differentKey      something else       legacy function which returns associate array reference myFunction myAssocArray    assert deepEqual myAssocArray  expectedAssocArray  compare two associative arrays

User · Answer

For expect   equal will compare objects rather than their data  and in your case it is two different arrays   Use  eql in order to deeply compare values  Check out this link  Or you could use  deep equal in order to simulate same as  eql  Or in your case you might want to check  members   For asserts you can use  deepEqual  link

User · Answer

You can use  deepEqual   const   assert     require  chai     assert deepEqual  0 0    0 0

[node.js] chai test array equality doesn't work as expected

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