Fix unit test helper method ThrowsArgumentException to work in any locale.
Fix unit test helper method ThrowsArgumentException to work in any locale.

mrward/NuGet.V2,RichiCoder1/nuget-chocolatey,pratikkagda/nuget,chocolatey/nuget-chocolatey,alluran/node.net,oliver-feng/nuget,pratikkagda/nuget,antiufo/NuGet2,oliver-feng/nuget,zskullz/nuget,GearedToWar/NuGet2,mono/nuget,jmezach/NuGet2,zskullz/nuget,dolkensp/node.net,oliver-feng/nuget,jholovacs/NuGet,xoofx/NuGet,anurse/NuGet,mono/nuget,xoofx/NuGet,indsoft/NuGet2,zskullz/nuget,jmezach/NuGet2,akrisiun/NuGet,oliver-feng/nuget,mrward/NuGet.V2,jmezach/NuGet2,rikoe/nuget,rikoe/nuget,mrward/NuGet.V2,xoofx/NuGet,OneGet/nuget,ctaggart/nuget,jmezach/NuGet2,xoofx/NuGet,jholovacs/NuGet,dolkensp/node.net,pratikkagda/nuget,RichiCoder1/nuget-chocolatey,indsoft/NuGet2,alluran/node.net,chocolatey/nuget-chocolatey,RichiCoder1/nuget-chocolatey,chocolatey/nuget-chocolatey,xoofx/NuGet,RichiCoder1/nuget-chocolatey,zskullz/nuget,jholovacs/NuGet,OneGet/nuget,antiufo/NuGet2,jmezach/NuGet2,antiufo/NuGet2,mrward/nuget,pratikkagda/nuget,dolkensp/node.net,alluran/node.net,mrward/nuget,OneGet/nuget,RichiCoder1/nuget-chocolatey,ctaggart/nuget,dolkensp/node.net,indsoft/NuGet2,OneGet/nuget,mono/nuget,mrward/NuGet.V2,jholovacs/NuGet,rikoe/nuget,anurse/NuGet,GearedToWar/NuGet2,xoofx/NuGet,ctaggart/nuget,antiufo/NuGet2,antiufo/NuGet2,ctaggart/nuget,oliver-feng/nuget,mrward/nuget,jmezach/NuGet2,chester89/nugetApi,antiufo/NuGet2,kumavis/NuGet,jholovacs/NuGet,mrward/NuGet.V2,GearedToWar/NuGet2,mono/nuget,chocolatey/nuget-chocolatey,kumavis/NuGet,mrward/nuget,chocolatey/nuget-chocolatey,GearedToWar/NuGet2,GearedToWar/NuGet2,rikoe/nuget,GearedToWar/NuGet2,chester89/nugetApi,akrisiun/NuGet,indsoft/NuGet2,chocolatey/nuget-chocolatey,mrward/NuGet.V2,RichiCoder1/nuget-chocolatey,alluran/node.net,mrward/nuget,pratikkagda/nuget,mrward/nuget,indsoft/NuGet2,oliver-feng/nuget,indsoft/NuGet2,jholovacs/NuGet,pratikkagda/nuget