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Add more String.Concat tests #8052
Merged
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Tests covering a few more special cases of String.Concat, including checking for a string.Empty optimization and a mini-stress test that tries to trigger the fallback defensive-copy case in String.Concat.
cc: @jkotas, @ellismg
(This won't pass CI until dotnet/coreclr#4559 is merged, due to the new checks for Assert.Same for the empty string case. That optimization existed for the other string.Concat overloads, but not for the string[] one previously.)