test: Move 'test/legacy' to 'test/functional'

Busted can only discover tests from a single directory. In order to allow tests
under 'legacy' to run as a functional test, it needed to be moved to
'test/functional'.

test/functional/legacy/002_filename_recognition_spec.lua

@@ -0,0 +1,42 @@
+-- Test if URLs are recognized as filenames by commands such as "gf". Here
+-- we'll use `expand("<cfile>")` since "gf" would need to open the file.
+
+local helpers = require('test.functional.helpers')
+local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
+local execute, expect = helpers.execute, helpers.expect
+
+describe('filename recognition', function()
+  setup(clear)
+
+  it('is working', function()
+    -- insert some lines containing URLs
+    insert([[
+      first test for URL://machine.name/tmp/vimtest2a and other text
+      second test for URL://machine.name/tmp/vimtest2b. And other text
+      third test for URL:\\machine.name\vimtest2c and other text
+      fourth test for URL:\\machine.name\tmp\vimtest2d, and other text]])
+
+    -- Go to the first URL and append it to the beginning
+    execute('/^first', '/tmp', 'call append(0, expand("<cfile>"))')
+
+    -- Repeat for the second URL
+    -- this time, navigate to the word "URL" instead of "tmp"
+    execute('/^second', '/URL', 'call append(1, expand("<cfile>"))')
+
+    -- Repeat for the remaining URLs. This time, the 'isfname' option must be
+    -- set to allow '\' in filenames
+    execute('set isf=@,48-57,/,.,-,_,+,,,$,:,~,\\')
+    execute('/^third', '/name', 'call append(2, expand("<cfile>"))')
+    execute('/^fourth', '/URL', 'call append(3, expand("<cfile>"))')
+
+    -- Delete the initial text, which now starts at line 5
+    feed('5GdG')
+
+    -- The buffer should now contain:
+    expect([[
+      URL://machine.name/tmp/vimtest2a
+      URL://machine.name/tmp/vimtest2b
+      URL:\\machine.name\vimtest2c
+      URL:\\machine.name\tmp\vimtest2d]])
+  end)
+end)