Separate flexi-streams-test.asd to satisfy ASDF 3.3

ASDF 3 expects secondary systems to use a slash in their system
name, e.g. foo.asd should only contain a system named 'foo' and
additional ones called 'foo/test', 'foo/api' etc. [1]

This change extracts the system flexi-streams-test to have its own
.asd file.

[1] https://common-lisp.net/project/asdf/asdf/Components.html#Components

flexi-streams-test.asd

@@ -0,0 +1,41 @@
+;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: CL-USER; Base: 10 -*-
+
+;;; Copyright (c) 2005-2008, Dr. Edmund Weitz.  All rights reserved.
+
+;;; Redistribution and use in source and binary forms, with or without
+;;; modification, are permitted provided that the following conditions
+;;; are met:
+
+;;;   * Redistributions of source code must retain the above copyright
+;;;     notice, this list of conditions and the following disclaimer.
+
+;;;   * Redistributions in binary form must reproduce the above
+;;;     copyright notice, this list of conditions and the following
+;;;     disclaimer in the documentation and/or other materials
+;;;     provided with the distribution.
+
+;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
+;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+(in-package :cl-user)
+
+(defpackage :flexi-streams-system
+  (:use :asdf :cl))
+
+(in-package :flexi-streams-system)
+
+(defsystem :flexi-streams-test
+  :components ((:module "test"
+                        :serial t
+                        :components ((:file "packages")
+                                     (:file "test"))))
+  :depends-on (:flexi-streams))

flexi-streams.asd

@@ -66,13 +66,6 @@
                (:file "strings"))
   :depends-on (:trivial-gray-streams))
 
-(defsystem :flexi-streams-test
-  :components ((:module "test"
-                        :serial t
-                        :components ((:file "packages")
-                                     (:file "test"))))
-  :depends-on (:flexi-streams))
-
 (defmethod perform ((o test-op) (c (eql (find-system 'flexi-streams))))
   (operate 'load-op 'flexi-streams-test)
   (funcall (intern (symbol-name :run-all-tests)