Change fields to SubString to save an alloc

Author: nickrobinson251

src/testcontext.jl

@@ -46,7 +46,7 @@ Base.size(x::FilteredVector) = size(x.vec)
 Base.getindex(x::FilteredVector, i) = x.vec[i]
 
 struct FileNode
-    path::String
+    path::SubString{String}
     testset::DefaultTestSet
     junit::Union{JUnitTestSuite,Nothing}
     testitems::FilteredVector{TestItem} # sorted by line number within file
@@ -62,7 +62,7 @@ Base.push!(f::FileNode, ti::TestItem) = push!(f.testitems, ti)
 walk(f, fn::FileNode) = foreach(f, fn.testitems)
 
 struct DirNode
-    path::String
+    path::SubString{String}
     testset::DefaultTestSet
     junit::Union{JUnitTestSuites,Nothing}
     children::Vector{Union{FileNode, DirNode}} # sorted lexically by path