R : Error in x[[method]](...) : attempt to apply non-function in testthat test when sourcing file

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R : Error in x[[method]](...) : attempt to apply non-function in testthat test when sourcing file
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R : Error in x[[method]](...) : attempt to apply non-function in testthat test when sourcing file
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in apply testthat sourcing test R : file in attempt x[[method]](...) when to non-function : Error



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