[Solved] Rspec pass test in ruby testing

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solution.highest_count_words_across_lines is an array of strings. When you do this: solution.highest_count_words_across_lines.map(&:highest_wf_words) you are calling highest_wf_words on each of the array items, and that method is not defined for a String (that is what the error message says).

I guess that in fact you want something like this instead:

words_found = solution.highest_count_words_across_lines.map( |x| highest_wf_words(x)).flatten

UPDATE

if the aim of your mapping is for the words_found only to include highest_wf_words, assuming that this is an array, here’s how you can do it:

words_found = solution.highest_count_words_across_lines.flatten & highest_wf_words

.

[1,2,3] & [2,3,4]
=> [2, 3]

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solved Rspec pass test in ruby testing