ruby/test/irb/test_cmd.rb
Gary Tou 4ee1f0fb5d [ruby/irb] Implement history command
(https://github.com/ruby/irb/pull/761)

* Implement `history` command

Lists IRB input history with indices. Also aliased as `hist`.

* Add tests for `history` command

* Address feedback: `puts` with multiple arguments instead of `join`ing

* Address feedback: Handle nil from splitting an empty input string

* Refactor line truncation

* Add `-g` grep option to `history` command

* Add `history` command to README

* Remove unused `*args` parameter

* Allow spaces to be included in grep

* Allow `/` to be included in grep regex

* Handle `input` being an empty string

* Exclude "#{index}: " from matching the grep regex

* Add new line after joining

3f9eacbfa9
2023-12-02 04:32:04 +00:00

955 lines
24 KiB
Ruby

# frozen_string_literal: false
require "rubygems"
require "irb"
require "irb/extend-command"
require_relative "helper"
module TestIRB
class CommandTestCase < TestCase
def setup
@pwd = Dir.pwd
@tmpdir = File.join(Dir.tmpdir, "test_reline_config_#{$$}")
begin
Dir.mkdir(@tmpdir)
rescue Errno::EEXIST
FileUtils.rm_rf(@tmpdir)
Dir.mkdir(@tmpdir)
end
Dir.chdir(@tmpdir)
@home_backup = ENV["HOME"]
ENV["HOME"] = @tmpdir
@xdg_config_home_backup = ENV.delete("XDG_CONFIG_HOME")
save_encodings
IRB.instance_variable_get(:@CONF).clear
@is_win = (RbConfig::CONFIG['host_os'] =~ /mswin|msys|mingw|cygwin|bccwin|wince|emc/)
end
def teardown
ENV["XDG_CONFIG_HOME"] = @xdg_config_home_backup
ENV["HOME"] = @home_backup
Dir.chdir(@pwd)
FileUtils.rm_rf(@tmpdir)
restore_encodings
end
def execute_lines(*lines, conf: {}, main: self, irb_path: nil)
IRB.init_config(nil)
IRB.conf[:VERBOSE] = false
IRB.conf[:PROMPT_MODE] = :SIMPLE
IRB.conf[:USE_PAGER] = false
IRB.conf.merge!(conf)
input = TestInputMethod.new(lines)
irb = IRB::Irb.new(IRB::WorkSpace.new(main), input)
irb.context.return_format = "=> %s\n"
irb.context.irb_path = irb_path if irb_path
IRB.conf[:MAIN_CONTEXT] = irb.context
capture_output do
irb.eval_input
end
end
end
class FrozenObjectTest < CommandTestCase
def test_calling_command_on_a_frozen_main
main = Object.new.freeze
out, err = execute_lines(
"irb_info",
main: main
)
assert_empty err
assert_match(/RUBY_PLATFORM/, out)
end
end
class InfoTest < CommandTestCase
def setup
super
@locals_backup = ENV.delete("LANG"), ENV.delete("LC_ALL")
end
def teardown
super
ENV["LANG"], ENV["LC_ALL"] = @locals_backup
end
def test_irb_info_multiline
FileUtils.touch("#{@tmpdir}/.inputrc")
FileUtils.touch("#{@tmpdir}/.irbrc")
out, err = execute_lines(
"irb_info",
conf: { USE_MULTILINE: true, USE_SINGLELINE: false }
)
expected = %r{
Ruby\sversion:\s.+\n
IRB\sversion:\sirb\s.+\n
InputMethod:\sAbstract\sInputMethod\n
Completion: .+\n
\.irbrc\spath:\s.+\n
RUBY_PLATFORM:\s.+\n
East\sAsian\sAmbiguous\sWidth:\s\d\n
#{@is_win ? 'Code\spage:\s\d+\n' : ''}
}x
assert_empty err
assert_match expected, out
end
def test_irb_info_singleline
FileUtils.touch("#{@tmpdir}/.inputrc")
FileUtils.touch("#{@tmpdir}/.irbrc")
out, err = execute_lines(
"irb_info",
conf: { USE_MULTILINE: false, USE_SINGLELINE: true }
)
expected = %r{
Ruby\sversion:\s.+\n
IRB\sversion:\sirb\s.+\n
InputMethod:\sAbstract\sInputMethod\n
Completion: .+\n
\.irbrc\spath:\s.+\n
RUBY_PLATFORM:\s.+\n
East\sAsian\sAmbiguous\sWidth:\s\d\n
#{@is_win ? 'Code\spage:\s\d+\n' : ''}
}x
assert_empty err
assert_match expected, out
end
def test_irb_info_multiline_without_rc_files
inputrc_backup = ENV["INPUTRC"]
ENV["INPUTRC"] = "unknown_inpurc"
ext_backup = IRB::IRBRC_EXT
IRB.__send__(:remove_const, :IRBRC_EXT)
IRB.const_set(:IRBRC_EXT, "unknown_ext")
out, err = execute_lines(
"irb_info",
conf: { USE_MULTILINE: true, USE_SINGLELINE: false }
)
expected = %r{
Ruby\sversion:\s.+\n
IRB\sversion:\sirb\s.+\n
InputMethod:\sAbstract\sInputMethod\n
Completion: .+\n
RUBY_PLATFORM:\s.+\n
East\sAsian\sAmbiguous\sWidth:\s\d\n
#{@is_win ? 'Code\spage:\s\d+\n' : ''}
}x
assert_empty err
assert_match expected, out
ensure
ENV["INPUTRC"] = inputrc_backup
IRB.__send__(:remove_const, :IRBRC_EXT)
IRB.const_set(:IRBRC_EXT, ext_backup)
end
def test_irb_info_singleline_without_rc_files
inputrc_backup = ENV["INPUTRC"]
ENV["INPUTRC"] = "unknown_inpurc"
ext_backup = IRB::IRBRC_EXT
IRB.__send__(:remove_const, :IRBRC_EXT)
IRB.const_set(:IRBRC_EXT, "unknown_ext")
out, err = execute_lines(
"irb_info",
conf: { USE_MULTILINE: false, USE_SINGLELINE: true }
)
expected = %r{
Ruby\sversion:\s.+\n
IRB\sversion:\sirb\s.+\n
InputMethod:\sAbstract\sInputMethod\n
Completion: .+\n
RUBY_PLATFORM:\s.+\n
East\sAsian\sAmbiguous\sWidth:\s\d\n
#{@is_win ? 'Code\spage:\s\d+\n' : ''}
}x
assert_empty err
assert_match expected, out
ensure
ENV["INPUTRC"] = inputrc_backup
IRB.__send__(:remove_const, :IRBRC_EXT)
IRB.const_set(:IRBRC_EXT, ext_backup)
end
def test_irb_info_lang
FileUtils.touch("#{@tmpdir}/.inputrc")
FileUtils.touch("#{@tmpdir}/.irbrc")
ENV["LANG"] = "ja_JP.UTF-8"
ENV["LC_ALL"] = "en_US.UTF-8"
out, err = execute_lines(
"irb_info",
conf: { USE_MULTILINE: true, USE_SINGLELINE: false }
)
expected = %r{
Ruby\sversion: .+\n
IRB\sversion:\sirb .+\n
InputMethod:\sAbstract\sInputMethod\n
Completion: .+\n
\.irbrc\spath: .+\n
RUBY_PLATFORM: .+\n
LANG\senv:\sja_JP\.UTF-8\n
LC_ALL\senv:\sen_US\.UTF-8\n
East\sAsian\sAmbiguous\sWidth:\s\d\n
}x
assert_empty err
assert_match expected, out
end
end
class MeasureTest < CommandTestCase
def test_measure
conf = {
PROMPT: {
DEFAULT: {
PROMPT_I: '> ',
PROMPT_S: '> ',
PROMPT_C: '> '
}
},
PROMPT_MODE: :DEFAULT,
MEASURE: false
}
c = Class.new(Object)
out, err = execute_lines(
"3\n",
"measure\n",
"3\n",
"measure :off\n",
"3\n",
conf: conf,
main: c
)
assert_empty err
assert_match(/\A=> 3\nTIME is added\.\n=> nil\nprocessing time: .+\n=> 3\n=> nil\n=> 3\n/, out)
assert_empty(c.class_variables)
end
def test_measure_keeps_previous_value
conf = {
PROMPT: {
DEFAULT: {
PROMPT_I: '> ',
PROMPT_S: '> ',
PROMPT_C: '> '
}
},
PROMPT_MODE: :DEFAULT,
MEASURE: false
}
c = Class.new(Object)
out, err = execute_lines(
"measure\n",
"3\n",
"_\n",
conf: conf,
main: c
)
assert_empty err
assert_match(/\ATIME is added\.\n=> nil\nprocessing time: .+\n=> 3\nprocessing time: .+\n=> 3/, out)
assert_empty(c.class_variables)
end
def test_measure_enabled_by_rc
conf = {
PROMPT: {
DEFAULT: {
PROMPT_I: '> ',
PROMPT_S: '> ',
PROMPT_C: '> '
}
},
PROMPT_MODE: :DEFAULT,
MEASURE: true
}
out, err = execute_lines(
"3\n",
"measure :off\n",
"3\n",
conf: conf,
)
assert_empty err
assert_match(/\Aprocessing time: .+\n=> 3\n=> nil\n=> 3\n/, out)
end
def test_measure_enabled_by_rc_with_custom
measuring_proc = proc { |line, line_no, &block|
time = Time.now
result = block.()
puts 'custom processing time: %fs' % (Time.now - time) if IRB.conf[:MEASURE]
result
}
conf = {
PROMPT: {
DEFAULT: {
PROMPT_I: '> ',
PROMPT_S: '> ',
PROMPT_C: '> '
}
},
PROMPT_MODE: :DEFAULT,
MEASURE: true,
MEASURE_PROC: { CUSTOM: measuring_proc }
}
out, err = execute_lines(
"3\n",
"measure :off\n",
"3\n",
conf: conf,
)
assert_empty err
assert_match(/\Acustom processing time: .+\n=> 3\n=> nil\n=> 3\n/, out)
end
def test_measure_with_custom
measuring_proc = proc { |line, line_no, &block|
time = Time.now
result = block.()
puts 'custom processing time: %fs' % (Time.now - time) if IRB.conf[:MEASURE]
result
}
conf = {
PROMPT: {
DEFAULT: {
PROMPT_I: '> ',
PROMPT_S: '> ',
PROMPT_C: '> '
}
},
PROMPT_MODE: :DEFAULT,
MEASURE: false,
MEASURE_PROC: { CUSTOM: measuring_proc }
}
out, err = execute_lines(
"3\n",
"measure\n",
"3\n",
"measure :off\n",
"3\n",
conf: conf
)
assert_empty err
assert_match(/\A=> 3\nCUSTOM is added\.\n=> nil\ncustom processing time: .+\n=> 3\n=> nil\n=> 3\n/, out)
end
def test_measure_with_proc
conf = {
PROMPT: {
DEFAULT: {
PROMPT_I: '> ',
PROMPT_S: '> ',
PROMPT_C: '> '
}
},
PROMPT_MODE: :DEFAULT,
MEASURE: false,
}
c = Class.new(Object)
out, err = execute_lines(
"3\n",
"measure { |context, code, line_no, &block|\n",
" result = block.()\n",
" puts 'aaa' if IRB.conf[:MEASURE]\n",
" result\n",
"}\n",
"3\n",
"measure { |context, code, line_no, &block|\n",
" result = block.()\n",
" puts 'bbb' if IRB.conf[:MEASURE]\n",
" result\n",
"}\n",
"3\n",
"measure :off\n",
"3\n",
conf: conf,
main: c
)
assert_empty err
assert_match(/\A=> 3\nBLOCK is added\.\n=> nil\naaa\n=> 3\nBLOCK is added.\naaa\n=> nil\nbbb\n=> 3\n=> nil\n=> 3\n/, out)
assert_empty(c.class_variables)
end
end
class IrbSourceTest < CommandTestCase
def test_irb_source
File.write("#{@tmpdir}/a.rb", "a = 'hi'\n")
out, err = execute_lines(
"a = 'bug17564'\n",
"a\n",
"irb_source '#{@tmpdir}/a.rb'\n",
"a\n",
)
assert_empty err
assert_pattern_list([
/=> "bug17564"\n/,
/=> "bug17564"\n/,
/ => "hi"\n/,
/ => nil\n/,
/=> "hi"\n/,
], out)
end
def test_irb_source_without_argument
out, err = execute_lines(
"irb_source\n",
)
assert_empty err
assert_match(/Please specify the file name./, out)
end
end
class IrbLoadTest < CommandTestCase
def test_irb_load
File.write("#{@tmpdir}/a.rb", "a = 'hi'\n")
out, err = execute_lines(
"a = 'bug17564'\n",
"a\n",
"irb_load '#{@tmpdir}/a.rb'\n",
"a\n",
)
assert_empty err
assert_pattern_list([
/=> "bug17564"\n/,
/=> "bug17564"\n/,
/ => "hi"\n/,
/ => nil\n/,
/=> "bug17564"\n/,
], out)
end
def test_irb_load_without_argument
out, err = execute_lines(
"irb_load\n",
)
assert_empty err
assert_match(/Please specify the file name./, out)
end
end
class WorkspaceCommandTestCase < CommandTestCase
def setup
super
# create Foo under the test class's namespace so it doesn't pollute global namespace
self.class.class_eval <<~RUBY
class Foo; end
RUBY
end
end
class CwwsTest < WorkspaceCommandTestCase
def test_cwws_returns_the_current_workspace_object
out, err = execute_lines(
"cwws.class",
)
assert_empty err
assert_include(out, self.class.name)
end
end
class PushwsTest < WorkspaceCommandTestCase
def test_pushws_switches_to_new_workspace_and_pushes_the_current_one_to_the_stack
out, err = execute_lines(
"pushws #{self.class}::Foo.new\n",
"cwws.class",
)
assert_empty err
assert_include(out, "#{self.class}::Foo")
end
def test_pushws_extends_the_new_workspace_with_command_bundle
out, err = execute_lines(
"pushws Object.new\n",
"self.singleton_class.ancestors"
)
assert_empty err
assert_include(out, "IRB::ExtendCommandBundle")
end
def test_pushws_prints_help_message_when_no_arg_is_given
out, err = execute_lines(
"pushws\n",
)
assert_empty err
assert_match(/No other workspace/, out)
end
end
class WorkspacesTest < WorkspaceCommandTestCase
def test_workspaces_returns_the_array_of_non_main_workspaces
out, err = execute_lines(
"pushws #{self.class}::Foo.new\n",
"workspaces.map { |w| w.class.name }",
)
assert_empty err
# self.class::Foo would be the current workspace
# self.class would be the old workspace that's pushed to the stack
assert_include(out, "=> [\"#{self.class}\"]")
end
def test_workspaces_returns_empty_array_when_no_workspaces_were_added
out, err = execute_lines(
"workspaces.map(&:to_s)",
)
assert_empty err
assert_include(out, "=> []")
end
end
class PopwsTest < WorkspaceCommandTestCase
def test_popws_replaces_the_current_workspace_with_the_previous_one
out, err = execute_lines(
"pushws Foo.new\n",
"popws\n",
"cwws.class",
)
assert_empty err
assert_include(out, "=> #{self.class}")
end
def test_popws_prints_help_message_if_the_workspace_is_empty
out, err = execute_lines(
"popws\n",
)
assert_empty err
assert_match(/workspace stack empty/, out)
end
end
class ChwsTest < WorkspaceCommandTestCase
def test_chws_replaces_the_current_workspace
out, err = execute_lines(
"chws #{self.class}::Foo.new\n",
"cwws.class",
)
assert_empty err
assert_include(out, "=> #{self.class}::Foo")
end
def test_chws_does_nothing_when_receiving_no_argument
out, err = execute_lines(
"chws\n",
"cwws.class",
)
assert_empty err
assert_include(out, "=> #{self.class}")
end
end
class WhereamiTest < CommandTestCase
def test_whereami
out, err = execute_lines(
"whereami\n",
)
assert_empty err
assert_match(/^From: .+ @ line \d+ :\n/, out)
end
def test_whereami_alias
out, err = execute_lines(
"@\n",
)
assert_empty err
assert_match(/^From: .+ @ line \d+ :\n/, out)
end
end
class ShowCmdsTest < CommandTestCase
def test_show_cmds
out, err = execute_lines(
"show_cmds\n"
)
assert_empty err
assert_match(/List all available commands and their description/, out)
assert_match(/Start the debugger of debug\.gem/, out)
end
def test_show_cmds_list_user_aliases
out, err = execute_lines(
"show_cmds\n"
)
assert_empty err
assert_match(/\$\s+Alias for `show_source`/, out)
assert_match(/@\s+Alias for `whereami`/, out)
end
end
class LsTest < CommandTestCase
def test_ls
out, err = execute_lines(
"class P\n",
" def m() end\n",
" def m2() end\n",
"end\n",
"class C < P\n",
" def m1() end\n",
" def m2() end\n",
"end\n",
"module M\n",
" def m1() end\n",
" def m3() end\n",
"end\n",
"module M2\n",
" include M\n",
" def m4() end\n",
"end\n",
"obj = C.new\n",
"obj.instance_variable_set(:@a, 1)\n",
"obj.extend M2\n",
"def obj.m5() end\n",
"ls obj\n",
)
assert_empty err
assert_match(/^instance variables:\s+@a\n/m, out)
assert_match(/P#methods:\s+m\n/m, out)
assert_match(/C#methods:\s+m2\n/m, out)
assert_match(/M#methods:\s+m1\s+m3\n/m, out)
assert_match(/M2#methods:\s+m4\n/m, out)
assert_match(/C.methods:\s+m5\n/m, out)
end
def test_ls_class
out, err = execute_lines(
"module M1\n",
" def m2; end\n",
" def m3; end\n",
"end\n",
"class C1\n",
" def m1; end\n",
" def m2; end\n",
"end\n",
"class C2 < C1\n",
" include M1\n",
" def m3; end\n",
" def m4; end\n",
" def self.m3; end\n",
" def self.m5; end\n",
"end\n",
"ls C2"
)
assert_empty err
assert_match(/C2.methods:\s+m3\s+m5\n/, out)
assert_match(/C2#methods:\s+m3\s+m4\n.*M1#methods:\s+m2\n.*C1#methods:\s+m1\n/, out)
assert_not_match(/Module#methods/, out)
assert_not_match(/Class#methods/, out)
end
def test_ls_module
out, err = execute_lines(
"module M1\n",
" def m1; end\n",
" def m2; end\n",
"end\n",
"module M2\n",
" include M1\n",
" def m1; end\n",
" def m3; end\n",
" def self.m4; end\n",
"end\n",
"ls M2"
)
assert_empty err
assert_match(/M2\.methods:\s+m4\n/, out)
assert_match(/M2#methods:\s+m1\s+m3\n.*M1#methods:\s+m2\n/, out)
assert_not_match(/Module#methods/, out)
end
def test_ls_instance
out, err = execute_lines(
"class Foo; def bar; end; end\n",
"ls Foo.new"
)
assert_empty err
assert_match(/Foo#methods:\s+bar/, out)
# don't duplicate
assert_not_match(/Foo#methods:\s+bar\n.*Foo#methods/, out)
end
def test_ls_grep
out, err = execute_lines("ls 42\n")
assert_empty err
assert_match(/times/, out)
assert_match(/polar/, out)
[
"ls 42, grep: /times/\n",
"ls 42 -g times\n",
"ls 42 -G times\n",
].each do |line|
out, err = execute_lines(line)
assert_empty err
assert_match(/times/, out)
assert_not_match(/polar/, out)
end
end
def test_ls_grep_empty
out, err = execute_lines("ls\n")
assert_empty err
assert_match(/whereami/, out)
assert_match(/show_source/, out)
[
"ls grep: /whereami/\n",
"ls -g whereami\n",
"ls -G whereami\n",
].each do |line|
out, err = execute_lines(line)
assert_empty err
assert_match(/whereami/, out)
assert_not_match(/show_source/, out)
end
end
def test_ls_with_no_singleton_class
out, err = execute_lines(
"ls 42",
)
assert_empty err
assert_match(/Comparable#methods:\s+/, out)
assert_match(/Numeric#methods:\s+/, out)
assert_match(/Integer#methods:\s+/, out)
end
end
class ShowDocTest < CommandTestCase
def test_help
out, err = execute_lines(
"help String#gsub\n",
"\n",
)
# the former is what we'd get without document content installed, like on CI
# the latter is what we may get locally
possible_rdoc_output = [/Nothing known about String#gsub/, /gsub\(pattern\)/]
assert_include err, "[Deprecation] The `help` command will be repurposed to display command help in the future.\n"
assert(possible_rdoc_output.any? { |output| output.match?(out) }, "Expect the `help` command to match one of the possible outputs. Got:\n#{out}")
ensure
# this is the only way to reset the redefined method without coupling the test with its implementation
EnvUtil.suppress_warning { load "irb/cmd/help.rb" }
end
def test_show_doc
out, err = execute_lines(
"show_doc String#gsub\n",
"\n",
)
# the former is what we'd get without document content installed, like on CI
# the latter is what we may get locally
possible_rdoc_output = [/Nothing known about String#gsub/, /gsub\(pattern\)/]
assert_not_include err, "[Deprecation]"
assert(possible_rdoc_output.any? { |output| output.match?(out) }, "Expect the `show_doc` command to match one of the possible outputs. Got:\n#{out}")
ensure
# this is the only way to reset the redefined method without coupling the test with its implementation
EnvUtil.suppress_warning { load "irb/cmd/help.rb" }
end
def test_show_doc_without_rdoc
out, err = without_rdoc do
execute_lines(
"show_doc String#gsub\n",
"\n",
)
end
# if it fails to require rdoc, it only returns the command object
assert_match(/=> nil\n/, out)
assert_include(err, "Can't display document because `rdoc` is not installed.\n")
ensure
# this is the only way to reset the redefined method without coupling the test with its implementation
EnvUtil.suppress_warning { load "irb/cmd/help.rb" }
end
end
class EditTest < CommandTestCase
def setup
@original_visual = ENV["VISUAL"]
@original_editor = ENV["EDITOR"]
# noop the command so nothing gets executed
ENV["VISUAL"] = ": code"
ENV["EDITOR"] = ": code2"
end
def teardown
ENV["VISUAL"] = @original_visual
ENV["EDITOR"] = @original_editor
end
def test_edit_without_arg
out, err = execute_lines(
"edit",
irb_path: __FILE__
)
assert_empty err
assert_match("path: #{__FILE__}", out)
assert_match("command: ': code'", out)
end
def test_edit_with_path
out, err = execute_lines(
"edit #{__FILE__}"
)
assert_empty err
assert_match("path: #{__FILE__}", out)
assert_match("command: ': code'", out)
end
def test_edit_with_non_existing_path
out, err = execute_lines(
"edit test_cmd_non_existing_path.rb"
)
assert_empty err
assert_match(/Can not find file: test_cmd_non_existing_path\.rb/, out)
end
def test_edit_with_constant
out, err = execute_lines(
"edit IRB::Irb"
)
assert_empty err
assert_match(/path: .*\/lib\/irb\.rb/, out)
assert_match("command: ': code'", out)
end
def test_edit_with_class_method
out, err = execute_lines(
"edit IRB.start"
)
assert_empty err
assert_match(/path: .*\/lib\/irb\.rb/, out)
assert_match("command: ': code'", out)
end
def test_edit_with_instance_method
out, err = execute_lines(
"edit IRB::Irb#run"
)
assert_empty err
assert_match(/path: .*\/lib\/irb\.rb/, out)
assert_match("command: ': code'", out)
end
def test_edit_with_editor_env_var
ENV.delete("VISUAL")
out, err = execute_lines(
"edit",
irb_path: __FILE__
)
assert_empty err
assert_match("path: #{__FILE__}", out)
assert_match("command: ': code2'", out)
end
end
class HistoryCmdTest < CommandTestCase
def teardown
TestInputMethod.send(:remove_const, "HISTORY") if defined?(TestInputMethod::HISTORY)
super
end
def test_history
TestInputMethod.const_set("HISTORY", %w[foo bar baz])
out, err = without_rdoc do
execute_lines("history")
end
assert_include(out, <<~EOF)
2: baz
1: bar
0: foo
EOF
assert_empty err
end
def test_multiline_history_with_truncation
TestInputMethod.const_set("HISTORY", ["foo", "bar", <<~INPUT])
[].each do |x|
puts x
end
INPUT
out, err = without_rdoc do
execute_lines("hist")
end
assert_include(out, <<~EOF)
2: [].each do |x|
puts x
...
1: bar
0: foo
EOF
assert_empty err
end
def test_history_grep
TestInputMethod.const_set("HISTORY", ["foo", "bar", <<~INPUT])
[].each do |x|
puts x
end
INPUT
out, err = without_rdoc do
execute_lines("hist -g each\n")
end
assert_include(out, <<~EOF)
2: [].each do |x|
puts x
...
EOF
assert_empty err
end
end
end