test_output: source_type is "javascript", not "js"

[MarijnS95]

None of the code mentions the string "js", only written-out "javascript" is used for this source_type.

[codecov]

Codecov Report

Merging #159 (4d3bc26) into main (8857fff) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #159   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            4         4           
  Lines          182       182           
  Branches        38        38           
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  Hits           182       182           

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[klaasnicolaas]

In the end it doesn't matter much because javascript is always the fallback option.

[MarijnS95]

In the end it doesn't matter much because javascript is always the fallback option.

I've changed this in #134 to still rely on the @dataclass default but to not correct for potential typos in this field - in that case these functions should really just fail with "I have no idea what source you want".