Tests success on local but fails in Travis CI

Hi All!
The question is in title. I had this error on travis:

Error During Test
  Test threw an exception of type MethodError
  Expression: countBases(readStringFromFile(joinpath(@__DIR__(), "data", "rosalind_dna.txt"))) == (201, 182, 223, 195)
  MethodError: Cannot `convert` an object of type Type{String} to an object of type Array{UInt8,1}
  This may have arisen from a call to the constructor Array{UInt8,1}(...),
  since type constructors fall back to convert methods.
  Stacktrace:
   [1] read(::IOStream, ::Type{T} where T) at ./io.jl:528
   [2] open(::Bioinformatics.##3#4, ::String) at ./iostream.jl:152
   [3] readStringFromFile(::String) at /home/travis/.julia/v0.6/Bioinformatics/test/../src/Bioinformatics.jl:80
   [4] include_from_node1(::String) at ./loading.jl:576
   [5] include(::String) at ./sysimg.jl:14
   [6] process_options(::Base.JLOptions) at ./client.jl:305
   [7] _start() at ./client.jl:371
ERROR: LoadError: There was an error during testing
while loading /home/travis/.julia/v0.6/Bioinformatics/test/runtests.jl, in expression starting on line 38

Code is here: https://github.com/mrtkp9993/Bioinformatics.jl/blob/master/src/Bioinformatics.jl
Also you can fix it and create a pull request.

Thank you.

read(f, String) is only possible on Julia v0.7. I’m guessing you’re running Julia v0.6 on Travis.

But I’m using 0.6.2.2 on local, not 0.7.

Are you using Compat locally?

I think I found my problem.
Firstly ,I changed my local Julia version to 0.7.
In my readFile method, I’m using strip function that returns a substring. But my countBases function expects a String, not a substring.

$ julia runtests.jl 
Error During Test at /Users/muratkoptur/Desktop/github/Bioinformatics.jl/test/runtests.jl:57
  Test threw exception MethodError(Main.Bioinformatics.countBases, ("ATACTTGGCCCAAGGCTTTCCGCAACGATTGGTCAGGCTTTACTGCGCGCTTATTAGGCTTCGAGTCCAGACATGCGACGTAAATACGATGAGGGTCTACTGATCAGTCTAAATGGGAGAGTCAGCGAGGATTGCGTCTTGACGATCAAATTAGTGAGGGAGGCGTTGCTCGCGATTTTTCCGTTCAATGTACGACATCGTATCATTGACCTTTACGTAATTCAGAGACCGGAACGGAGTGGTTACCACTGACGCTAACGCAGGTAGGAGACGCGAATCAATTCCGACCGCCGCGTAGAGGGGCGTTAACGCGGAAAGAACGCACCAATGCTAGCTGTTTATTAAGCCTTTCGTGAGATAAAGTACAACAACCGCCAGGCCCAGTTCAAGCAAACTAGCTAACGAGCGCTGCTCCGTCGATATATCTATGACCGTGCCTTGAATGCGCTCATGGGTCGCAAGACGGGAAGGGTTAGCCGAGAAATTGATCTGATACACACACTGCCGACTCTGGCGTTGAGTCTGTTCGGTAATGCCAGGCCCACGATGCCTCTAATAGAGCACGTTACTTGGCACGGCGGAGCCGATGTCTAGGATCATCAGGCTGTTGGAGTAACAAATTAAGTTTAAAGACGCCTTTGCCTGTATGTCCTTTAGGCGATTGCTCGTAGGCACAGTTGCGAGTCTCGACCCTATGTTGGAAGAGGAGCAAGGGACCGTGTATCCCAGTCTAGGCGATGTGGTAGGGTAAGTTTGAGCCTGTTCGTGACTCTCGCATACATAAGGAGTAGGAAATGGTTC",), 0x0000000000006bbc)
  Expression: Bioinformatics.countBases(Bioinformatics.readStringFromFile(joinpath(#= /Users/muratkoptur/Desktop/github/Bioinformatics.jl/test/runtests.jl:59 =# @__DIR__(), "data", "rosalind_dna.txt")))
  MethodError: no method matching countBases(::SubString{String})
  Closest candidates are:
    countBases(!Matched::String) at /Users/muratkoptur/Desktop/github/Bioinformatics.jl/src/Bioinformatics.jl:92
  Stacktrace:
   [1] top-level scope at none:0
   [2] include at ./boot.jl:317 [inlined]
   [3] include_relative(::Module, ::String) at ./loading.jl:1034
   [4] include(::Module, ::String) at ./sysimg.jl:29
   [5] exec_options(::Base.JLOptions) at ./client.jl:234
   [6] _start() at ./client.jl:427
ERROR: LoadError: There was an error during testing
in expression starting at /Users/muratkoptur/Desktop/github/Bioinformatics.jl/test/runtests.jl:57

Edit: Done. I used String(strip(...)) and problem solved.