Validate NuGet package strings

src/base/validation.lua

@@ -62,6 +62,7 @@
 			m.projectRulesExist,
 			m.projectValuesInScope,
 			m.NuGetHasHTTP,
+			m.NuGetPackageStrings,
 		}
 	end
 
@@ -231,6 +232,17 @@
 	end
 
 
+	function m.NuGetPackageStrings(prj)
+		for _, package in ipairs(prj.nuget) do
+			local components = package:explode(":")
+
+			if #components ~= 2 or #components[1] == 0 or #components[2] == 0 then
+				p.error("NuGet package '%s' in project '%s' is invalid - please give packages in the format 'id:version', e.g. 'NUnit:3.6.1'", package, prj.name)
+			end
+		end
+	end
+
+
 	function m.uniqueProjectIds(wks)
 		local uuids = {}
 		for prj in p.workspace.eachproject(wks) do