pkgsh/test/coreutils/test-cat.sh

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#!/bin/bash
# Tests bash implementation of cat
#
# Copyright (C) 2014 Mike Gerwitz
#
# This file is part of pkgsh.
#
# pkgsh is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
##
source src/coreutils/cat.sh
set -T
declare -r qcalled=$'\001'
trap _callset RETURN
_callset()
{
# can't set a var because we're likely in a subshell
if [ "${FUNCNAME[1]}" == quickcat ]; then
# quickcat recurses
if [ "${FUNCNAME[2]}" != quickcat ]; then
echo -n "$qcalled"
fi
fi
}
_chk()
{
local given="$1" expected="$2"
[[ "$given" =~ "$qcalled"$ ]] \
|| assert -z "quickcat not called: $given"
given="${given%$qcalled}"
assert "$given" == "$expected"
}
_readall()
{
local -r var="$1"
IFS= read -rd '' "$var" || true
}
##
# Leading and trailing whitespace, be it spaces, newlines, or otherwise,
# should be retained (something that the shell does not normally like doing)
test-retains-leading-trailing-whitespace()
{
_readall val < <( echo -e "\n foo \n" )
_readall expected < <( command cat <( echo -n "$val" ) )
_readall given < <( cat <( echo -n "$val" ) )
_chk "$given" "$expected"
}
##
# If there is no trailing newline, one should not be added
test-does-not-add-trailing-whitespace()
{
_readall expected < <( command cat <( echo -n foo ) )
_readall given < <( cat <( echo -n foo ) )
_chk "$given" "$expected"
}
##
# It is, after all, what `cat` is good at
test-concatenates-multiple-files()
{
_readall expected < <( command cat <( echo -n foo ) <( echo "Bar" ) )
_readall given < <( cat <( echo -n foo ) <( echo "Bar" ) )
_chk "$given" "$expected"
}
##
# As by convention, `-` means `stdin` and can appear anywhere in the file
# list
test-can-read-stdin-via-dash()
{
_readall expected < <( command cat <( echo -n foo ) - <<< "Baz" )
_readall given < <( cat <( echo -n foo ) - <<< "Baz" )
_chk "$given" "$expected"
}
##
# If no arguments are provided, input is accepted from `stdin`
test-defaults-to-stdin()
{
_readall expected < <( command cat <<< "foo" )
_readall given < <( cat <<< "foo" )
_chk "$given" "$expected"
}
##
# We do not currently handle any options; defer to system binary
test-any-option-defers-to-binary()
{
_readall given < <( cat -E <<< "foo" )
# note that this assertion will implicitly ensure that quickcat was not
# called; see _callset
assert "$given" == 'foo$'$'\n'
}
test-concatenates-multiple-files
test-can-read-stdin-via-dash
test-defaults-to-stdin
test-retains-leading-trailing-whitespace
test-does-not-add-trailing-whitespace
test-any-option-defers-to-binary