patch 8.1.1285: test17 is old style

Problem:    Test17 is old style.
Solution:   Turn into new style test. (Yegappan Lakshmanan, closes #4347)

src/testdir/test_checkpath.vim

@@ -0,0 +1,104 @@
+" Tests for the :checkpath command
+
+" Test for 'include' without \zs or \ze
+func Test_checkpath1()
+  call mkdir("Xdir1/dir2", "p")
+  call writefile(['#include    "bar.a"'], 'Xdir1/dir2/foo.a')
+  call writefile(['#include    "baz.a"'], 'Xdir1/dir2/bar.a')
+  call writefile(['#include    "foo.a"'], 'Xdir1/dir2/baz.a')
+  call writefile(['#include    <foo.a>'], 'Xbase.a')
+
+  edit Xbase.a
+  set path=Xdir1/dir2
+  let res = split(execute("checkpath!"), "\n")
+  call assert_equal([
+	      \ '--- Included files in path ---',
+	      \ 'Xdir1/dir2/foo.a',
+	      \ 'Xdir1/dir2/foo.a -->',
+	      \ '  Xdir1/dir2/bar.a',
+	      \ '  Xdir1/dir2/bar.a -->',
+	      \ '    Xdir1/dir2/baz.a',
+	      \ '    Xdir1/dir2/baz.a -->',
+	      \ '      "foo.a"  (Already listed)'], res)
+
+  enew
+  call delete("./Xbase.a")
+  call delete("Xdir1", "rf")
+  set path&
+endfunc
+
+func DotsToSlashes()
+  return substitute(v:fname, '\.', '/', 'g') . '.b'
+endfunc
+
+" Test for 'include' with \zs and \ze
+func Test_checkpath2()
+  call mkdir("Xdir1/dir2", "p")
+  call writefile(['%inc    /bar/'], 'Xdir1/dir2/foo.b')
+  call writefile(['%inc    /baz/'], 'Xdir1/dir2/bar.b')
+  call writefile(['%inc    /foo/'], 'Xdir1/dir2/baz.b')
+  call writefile(['%inc    /foo/'], 'Xbase.b')
+
+  let &include='^\s*%inc\s*/\zs[^/]\+\ze'
+  let &includeexpr='DotsToSlashes()'
+
+  edit Xbase.b
+  set path=Xdir1/dir2
+  let res = split(execute("checkpath!"), "\n")
+  call assert_equal([
+	      \ '--- Included files in path ---',
+	      \ 'Xdir1/dir2/foo.b',
+	      \ 'Xdir1/dir2/foo.b -->',
+	      \ '  Xdir1/dir2/bar.b',
+	      \ '  Xdir1/dir2/bar.b -->',
+	      \ '    Xdir1/dir2/baz.b',
+	      \ '    Xdir1/dir2/baz.b -->',
+	      \ '      foo  (Already listed)'], res)
+
+  enew
+  call delete("./Xbase.b")
+  call delete("Xdir1", "rf")
+  set path&
+  set include&
+  set includeexpr&
+endfunc
+
+func StripNewlineChar()
+  if v:fname =~ '\n$'
+    return v:fname[:-2]
+  endif
+  return v:fname
+endfunc
+
+" Test for 'include' with \zs and no \ze
+func Test_checkpath3()
+  call mkdir("Xdir1/dir2", "p")
+  call writefile(['%inc    bar.c'], 'Xdir1/dir2/foo.c')
+  call writefile(['%inc    baz.c'], 'Xdir1/dir2/bar.c')
+  call writefile(['%inc    foo.c'], 'Xdir1/dir2/baz.c')
+  call writefile(['%inc    foo.c'], 'Xdir1/dir2/FALSE.c')
+  call writefile(['%inc    FALSE.c foo.c'], 'Xbase.c')
+
+  let &include='^\s*%inc\s*\%([[:upper:]][^[:space:]]*\s\+\)\?\zs\S\+\ze'
+  let &includeexpr='StripNewlineChar()'
+
+  edit Xbase.c
+  set path=Xdir1/dir2
+  let res = split(execute("checkpath!"), "\n")
+  call assert_equal([
+	      \ '--- Included files in path ---',
+	      \ 'Xdir1/dir2/foo.c',
+	      \ 'Xdir1/dir2/foo.c -->',
+	      \ '  Xdir1/dir2/bar.c',
+	      \ '  Xdir1/dir2/bar.c -->',
+	      \ '    Xdir1/dir2/baz.c',
+	      \ '    Xdir1/dir2/baz.c -->',
+	      \ '      foo.c  (Already listed)'], res)
+
+  enew
+  call delete("./Xbase.c")
+  call delete("Xdir1", "rf")
+  set path&
+  set include&
+  set includeexpr&
+endfunc