Commitc0280bc

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psql: More tests

Add some basic tests for command-line option handling and help output,similar to what we have for other command-line programs. This alsocreates a place to put some more one-off test cases later.Discussion:https://www.postgresql.org/message-id/2570e2ae-fa0f-aac9-f72f-bb59a9983a20@enterprisedb.com

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	`1`	`+`
	`2`	`+# Copyright (c) 2021, PostgreSQL Global Development Group`
	`3`	`+`
	`4`	`+use strict;`
	`5`	`+use warnings;`
	`6`	`+`
	`7`	`+use PostgresNode;`
	`8`	`+use TestLib;`
	`9`	`+use Test::Moretests=> 23;`
	`10`	`+`
	`11`	`+program_help_ok('psql');`
	`12`	`+program_version_ok('psql');`
	`13`	`+program_options_handling_ok('psql');`
	`14`	`+`
	`15`	`+my ($stdout,$stderr);`
	`16`	`+my$result;`
	`17`	`+`
	`18`	`+# test --help=foo, analogous to program_help_ok()`
	`19`	`+foreachmy$arg (qw(commands variables))`
	`20`	`+{`
	`21`	`+$result = IPC::Run::run ['psql',"--help=$arg" ],'>', \$stdout,'2>', \$stderr;`
	`22`	`+ok($result,"psql --help=$arg exit code 0");`
	`23`	`+isnt($stdout,'',"psql --help=$arg goes to stdout");`
	`24`	`+is($stderr,'',"psql --help=$arg nothing to stderr");`
	`25`	`+}`
	`26`	`+`
	`27`	`+my$node = PostgresNode->new('main');`
	`28`	`+$node->init;`
	`29`	`+$node->start;`
	`30`	`+`
	`31`	`+$node->command_like(['psql','-c','\copyright' ],qr/Copyright/,'\copyright');`
	`32`	`+$node->command_like(['psql','-c','\help' ],qr/ALTER/,'\help without arguments');`
	`33`	`+$node->command_like(['psql','-c','\help SELECT' ],qr/SELECT/,'\help');`

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