-- testes/lush/commands.lua
-- Tests for backtick command execution (issues #02, #03).

print "testing backtick commands"

-- basic command, result is a table with code/stdout/stderr
do
  local r = `echo hello`
  assert(type(r) == "table")
  assert(type(r.code) == "number")
  assert(type(r.stdout) == "string")
  assert(type(r.stderr) == "string")
end

-- successful command returns exit code 0
do
  local r = `true`
  assert(r.code == 0)
end

-- failed command returns non-zero exit code
do
  local r = `false`
  assert(r.code == 1)
end

-- specific exit codes are preserved
do
  local r = `sh -c "exit 42"`
  assert(r.code == 42)
end

-- command not found returns 127
do
  local r = `nonexistent_command_xyz_999`
  assert(r.code == 127)
end

-- stdout capture
do
  local r = `echo hello`
  assert(r.stdout == "hello\n")
end

-- stderr capture
do
  local r = `sh -c "echo err >&2"`
  assert(r.stderr == "err\n")
  assert(r.stdout == "")
end

-- stdout and stderr are independent
do
  local r = `sh -c "echo out; echo err >&2"`
  assert(r.stdout == "out\n")
  assert(r.stderr == "err\n")
end

-- empty command returns code 0 and empty strings
do
  local r = ``
  assert(r.code == 0)
  assert(r.stdout == "")
  assert(r.stderr == "")
end

-- multi-word output preserved
do
  local r = `echo hello world`
  assert(r.stdout == "hello world\n")
end

-- backtick as statement (result discarded, no error)
do
  `true`
end

-- backtick result used inline
do
  local code = `true`.code
  assert(code == 0)
end

-- multiline output captured
do
  local r = `printf "a\nb\nc\n"`
  assert(r.stdout == "a\nb\nc\n")
end

print "OK"