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    There are no random tests.

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    ϕ = 
      n11 * n00 - n10 * n01
      ----------------
      sqrt√(n1 * n0 * n1 * n0)
    

    This formula is wrong; the denominator should be sqrt((n00 + n01) * (n10 + n11) * (n00 + n10) * (n01 + n11)).

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    This problem has been copied from Eloquent Javascript which is licensed under Creative Commons attribution-noncommercial license.

    In which it is clearly mentioned:

    You are free to:
    
        Share — copy and redistribute the material in any medium or format
        Adapt — remix, transform, and build upon the material
    
        The licensor cannot revoke these freedoms as long as you follow the license terms.
    
    
    Under the following terms:
    
        Attribution — You must give appropriate credit, provide a link to the license, and 
        indicate if changes were made. You may do so in any reasonable manner, but not in any
        way that suggests the licensor endorses you or your use. 
    

    So you've to give the credit in the description.