tests: use "cat" also on Windows

Fixes neovim#10574.

Keeps 'can be called recursively' pending for now, see
neovim#10580 (comment).

test/functional/core/job_spec.lua

@@ -159,7 +159,7 @@ describe('jobs', function()
   end)
 
   it('allows interactive commands', function()
-    nvim('command', "let j = jobstart(has('win32') ? ['find', '/v', ''] : ['cat', '-'], g:job_opts)")
+    nvim('command', "let j = jobstart(['cat', '-'], g:job_opts)")
     neq(0, eval('j'))
     nvim('command', 'call jobsend(j, "abc\\n")')
     eq({'notification', 'stdout', {0, {'abc', ''}}}, next_msg())
@@ -187,7 +187,6 @@ describe('jobs', function()
   end)
 
   it('preserves NULs', function()
-    if helpers.pending_win32(pending) then return end  -- TODO: Need `cat`.
     -- Make a file with NULs in it.
     local filename = helpers.tmpname()
     write_file(filename, "abc\0def\n")
@@ -206,7 +205,6 @@ describe('jobs', function()
   end)
 
   it("will not buffer data if it doesn't end in newlines", function()
-    if helpers.pending_win32(pending) then return end  -- TODO: Need `cat`.
     if os.getenv("TRAVIS") and os.getenv("CC") == "gcc-4.9"
       and helpers.os_name() == "osx" then
       -- XXX: Hangs Travis macOS since e9061117a5b8f195c3f26a5cb94e18ddd7752d86.
@@ -223,15 +221,13 @@ describe('jobs', function()
   end)
 
   it('preserves newlines', function()
-    if helpers.pending_win32(pending) then return end  -- TODO: Need `cat`.
     nvim('command', "let j = jobstart(['cat', '-'], g:job_opts)")
     nvim('command', 'call jobsend(j, "a\\n\\nc\\n\\n\\n\\nb\\n\\n")')
     eq({'notification', 'stdout',
       {0, {'a', '', 'c', '', '', '', 'b', '', ''}}}, next_msg())
   end)
 
   it('preserves NULs', function()
-    if helpers.pending_win32(pending) then return end  -- TODO: Need `cat`.
     nvim('command', "let j = jobstart(['cat', '-'], g:job_opts)")
     nvim('command', 'call jobsend(j, ["\n123\n", "abc\\nxyz\n", ""])')
     eq({'notification', 'stdout', {0, {'\n123\n', 'abc\nxyz\n', ''}}},
@@ -242,7 +238,6 @@ describe('jobs', function()
   end)
 
   it('avoids sending final newline', function()
-    if helpers.pending_win32(pending) then return end  -- TODO: Need `cat`.
     nvim('command', "let j = jobstart(['cat', '-'], g:job_opts)")
     nvim('command', 'call jobsend(j, ["some data", "without\nfinal nl"])')
     eq({'notification', 'stdout', {0, {'some data', 'without\nfinal nl'}}},
@@ -253,14 +248,14 @@ describe('jobs', function()
   end)
 
   it('closes the job streams with jobclose', function()
-    nvim('command', "let j = jobstart(has('win32') ? ['find', '/v', ''] : ['cat', '-'], g:job_opts)")
+    nvim('command', "let j = jobstart(['cat', '-'], g:job_opts)")
     nvim('command', 'call jobclose(j, "stdin")')
     eq({'notification', 'stdout', {0, {''}}}, next_msg())
-    eq({'notification', 'exit', {0, iswin() and 1 or 0}}, next_msg())
+    eq({'notification', 'exit', {0, 0}}, next_msg())
   end)
 
   it("disallows jobsend on a job that closed stdin", function()
-    nvim('command', "let j = jobstart(has('win32') ? ['find', '/v', ''] : ['cat', '-'], g:job_opts)")
+    nvim('command', "let j = jobstart(['cat', '-'], g:job_opts)")
     nvim('command', 'call jobclose(j, "stdin")')
     eq(false, pcall(function()
       nvim('command', 'call jobsend(j, ["some data"])')
@@ -273,7 +268,7 @@ describe('jobs', function()
   end)
 
   it('disallows jobstop twice on the same job', function()
-    nvim('command', "let j = jobstart(has('win32') ? ['find', '/v', ''] : ['cat', '-'], g:job_opts)")
+    nvim('command', "let j = jobstart(['cat', '-'], g:job_opts)")
     neq(0, eval('j'))
     eq(true, pcall(eval, "jobstop(j)"))
     eq(false, pcall(eval, "jobstop(j)"))
@@ -284,7 +279,7 @@ describe('jobs', function()
   end)
 
   it('can get the pid value using getpid', function()
-    nvim('command', "let j =  jobstart(has('win32') ? ['find', '/v', ''] : ['cat', '-'], g:job_opts)")
+    nvim('command', "let j =  jobstart(['cat', '-'], g:job_opts)")
     local pid = eval('jobpid(j)')
     neq(NIL, meths.get_proc(pid))
     nvim('command', 'call jobstop(j)')
@@ -759,7 +754,7 @@ describe('jobs', function()
   it('cannot have both rpc and pty options', function()
     command("let g:job_opts.pty = v:true")
     command("let g:job_opts.rpc = v:true")
-    local _, err = pcall(command, "let j = jobstart(has('win32') ? ['find', '/v', ''] : ['cat', '-'], g:job_opts)")
+    local _, err = pcall(command, "let j = jobstart(['cat', '-'], g:job_opts)")
     ok(string.find(err, "E475: Invalid argument: job cannot have both 'pty' and 'rpc' options set") ~= nil)
   end)