Add missing test file.

src/testdir/test_goto.vim

@@ -0,0 +1,10 @@
+" Test commands that jump somewhere.
+
+func Test_geedee()
+  new
+  call setline(1, ["Filename x;", "", "int Filename", "int func() {", "Filename y;"])
+  /y;/
+  normal gD
+  call assert_equal(1, line('.'))
+  quit!
+endfunc