Wrap unbound_args.jl into module

src/unbound_args.jl

@@ -33,7 +33,7 @@ h(x1::T, x2::T...) = do_something(T[x1, x2...])
 ```
 """
 function test_unbound_args(m::Module; broken::Bool = false)
-    unbounds = detect_unbound_args_recursively(m)
+    unbounds = UnboundArgs.detect_unbound_args_recursively(m)
     if !isempty(unbounds)
         printstyled(
             stderr,
@@ -51,19 +51,27 @@ function test_unbound_args(m::Module; broken::Bool = false)
     end
 end
 
+module UnboundArgs
+
+using Test
+
 # There used to be a bug in `Test.detect_unbound_args` when used on
 # a top-level module together with `recursive = true`, see
 # <https://github.com/JuliaLang/julia/pull/31972>. This was fixed
 # some time between 1.4.2 and 1.5.4, but for older versions we
 # define `detect_unbound_args_recursively` with a workaround.
 @static if VERSION < v"1.5.4"
+    using Aqua: walkmodules
+
     function detect_unbound_args_recursively(m)
         methods = []
         walkmodules(m) do x
-            append!(methods, detect_unbound_args(x))
+            append!(methods, Test.detect_unbound_args(x))
         end
         return methods
     end
 else
     detect_unbound_args_recursively(m) = Test.detect_unbound_args(m; recursive = true)
 end
+
+end # module