Fix enumeration of arguments

Author: mmiller-max

src/args.jl

@@ -84,7 +84,7 @@ function get_query_args_str(args::AbstractDict)
                 end
                 if enumerate > 0
                     name = fieldname * "__" * string(enumerate)
-                    str *= string(enumerate)
+                    str *= "__" *string(enumerate)
                 end
 
                 # Add to tracker

test/args.jl

@@ -57,6 +57,8 @@ end
     ])
     str, arg_names = GraphQLClient.get_query_args_str(args)
     @test length(unique(vcat(collect(values(arg_names["vec"][1])), collect(values(arg_names["vec"][2]))))) == 4 # four unique names
+    @test all(key -> occursin(key, str), keys(arg_names["vec"][1]))  # Check all arg_names are in str
+    @test all(key -> occursin(key, str), keys(arg_names["vec"][2]))  # Check all arg_names are in str
 
     # Different fields with same keys
     args = Dict(