shunit2_test_helpers

# vim:et:ft=sh:sts=2:sw=2
#
# shUnit2 unit test common functions
#
# Copyright 2008-2021 Kate Ward. All Rights Reserved.
# Released under the Apache 2.0 license.
# http://www.apache.org/licenses/LICENSE-2.0
#
# Author: kate.ward@forestent.com (Kate Ward)
# https://github.com/kward/shunit2
#
### ShellCheck (http://www.shellcheck.net/)
# expr may be antiquated, but it is the only solution in some cases.
#   shellcheck disable=SC2003
# $() are not fully portable (POSIX != portable).
#   shellcheck disable=SC2006

# Exit immediately if a simple command exits with a non-zero status.
set -e

# Treat unset variables as an error when performing parameter expansion.
set -u

# Set shwordsplit for zsh.
[ -n "${ZSH_VERSION:-}" ] && setopt shwordsplit

#
# Constants.
#

# Path to shUnit2 library. Can be overridden by setting SHUNIT_INC.
TH_SHUNIT=${SHUNIT_INC:-./shunit2}; export TH_SHUNIT

# Configure debugging. Set the DEBUG environment variable to any
# non-empty value to enable debug output, or TRACE to enable trace
# output.
TRACE=${TRACE:+'th_trace '}
[ -n "${TRACE}" ] && DEBUG=1
[ -z "${TRACE}" ] && TRACE=':'

DEBUG=${DEBUG:+'th_debug '}
[ -z "${DEBUG}" ] && DEBUG=':'

#
# Variables.
#

th_RANDOM=0

#
# Functions.
#

# Logging functions.
th_trace() { echo "test:TRACE $*" >&2; }
th_debug() { echo "test:DEBUG $*" >&2; }
th_info()  { echo "test:INFO $*" >&2; }
th_warn()  { echo "test:WARN $*" >&2; }
th_error() { echo "test:ERROR $*" >&2; }
th_fatal() { echo "test:FATAL $*" >&2; }

# Output subtest name.
th_subtest() { echo " $*" >&2; }

th_oneTimeSetUp() {
  # These files will be cleaned up automatically by shUnit2.
  stdoutF="${SHUNIT_TMPDIR}/stdout"
  stderrF="${SHUNIT_TMPDIR}/stderr"
  returnF="${SHUNIT_TMPDIR}/return"
  expectedF="${SHUNIT_TMPDIR}/expected"
  export stdoutF stderrF returnF expectedF
}

# Generate a random number.
th_generateRandom() {
  tfgr_random=${th_RANDOM}

  while [ "${tfgr_random}" = "${th_RANDOM}" ]; do
    # shellcheck disable=SC2039
    if [ -n "${RANDOM:-}" ]; then
      # $RANDOM works
      # shellcheck disable=SC2039
      tfgr_random=${RANDOM}${RANDOM}${RANDOM}$$
    elif [ -r '/dev/urandom' ]; then
      tfgr_random=`od -vAn -N4 -tu4 </dev/urandom |sed 's/^[^0-9]*//'`
    else
      tfgr_date=`date '+%H%M%S'`
      tfgr_random=`expr "${tfgr_date}" \* $$`
      unset tfgr_date
    fi
    [ "${tfgr_random}" = "${th_RANDOM}" ] && sleep 1
  done

  th_RANDOM=${tfgr_random}
  unset tfgr_random
}

# This section returns the data section from the specified section of a file. A
# data section is defined by a [header], one or more lines of data, and then a
# blank line.
th_getDataSect() {
  th_sgrep "\\[$1\\]" "$2" |sed '1d'
}

# This function greps a section from a file. a section is defined as a group of
# lines preceded and followed by blank lines..
th_sgrep() {
  th_pattern_=$1
  shift

  # shellcheck disable=SC2068
  sed -e '/./{H;$!d;}' -e "x;/${th_pattern_}/"'!d;' $@ |sed '1d'

  unset th_pattern_
}

# Custom assert that checks for true return value (0), and no output to STDOUT
# or STDERR. If a non-zero return value is encountered, the output of STDERR
# will be output.
#
# Args:
#  th_test_: string: name of the subtest
#  th_rtrn_: integer: the return value of the subtest performed
#  th_stdout_: string: filename where stdout was redirected to
#  th_stderr_: string: filename where stderr was redirected to
th_assertTrueWithNoOutput() {
  th_test_=$1
  th_rtrn_=$2
  th_stdout_=$3
  th_stderr_=$4

  assertEquals "${th_test_}: expected return value of true" "${SHUNIT_TRUE}" "${th_rtrn_}"
  assertFalse "${th_test_}: expected no output to STDOUT" "[ -s '${th_stdout_}' ]"
  assertFalse "${th_test_}: expected no output to STDERR" "[ -s '${th_stderr_}' ]"
  # shellcheck disable=SC2166
  if [ -s "${th_stdout_}" -o -s "${th_stderr_}" ]; then
    _th_showOutput "${SHUNIT_FALSE}" "${th_stdout_}" "${th_stderr_}"
  fi

  unset th_test_ th_rtrn_ th_stdout_ th_stderr_
}

# Custom assert that checks for non-zero return value, output to STDOUT, but no
# output to STDERR.
#
# Args:
#  th_test_: string: name of the subtest
#  th_rtrn_: integer: the return value of the subtest performed
#  th_stdout_: string: filename where stdout was redirected to
#  th_stderr_: string: filename where stderr was redirected to
th_assertFalseWithOutput()
{
  th_test_=$1
  th_rtrn_=$2
  th_stdout_=$3
  th_stderr_=$4

  assertNotEquals "${th_test_}: expected non-true return value" "${SHUNIT_TRUE}" "${th_rtrn_}"
  assertTrue "${th_test_}: expected output to STDOUT" "[ -s '${th_stdout_}' ]"
  assertFalse "${th_test_}: expected no output to STDERR" "[ -s '${th_stderr_}' ]"
  # shellcheck disable=SC2166
  if ! [ -s "${th_stdout_}" -a ! -s "${th_stderr_}" ]; then
    _th_showOutput "${SHUNIT_FALSE}" "${th_stdout_}" "${th_stderr_}"
  fi

  unset th_test_ th_rtrn_ th_stdout_ th_stderr_
}

# Custom assert that checks for non-zero return value, no output to STDOUT, but
# output to STDERR.
#
# Args:
#  th_test_: string: name of the subtest
#  th_rtrn_: integer: the return value of the subtest performed
#  th_stdout_: string: filename where stdout was redirected to
#  th_stderr_: string: filename where stderr was redirected to
th_assertFalseWithError() {
  th_test_=$1
  th_rtrn_=$2
  th_stdout_=$3
  th_stderr_=$4

  assertFalse "${th_test_}: expected non-zero return value" "${th_rtrn_}"
  assertFalse "${th_test_}: expected no output to STDOUT" "[ -s '${th_stdout_}' ]"
  assertTrue "${th_test_}: expected output to STDERR" "[ -s '${th_stderr_}' ]"
  # shellcheck disable=SC2166
  if ! [ ! -s "${th_stdout_}" -a -s "${th_stderr_}" ]; then
    _th_showOutput "${SHUNIT_FALSE}" "${th_stdout_}" "${th_stderr_}"
  fi

  unset th_test_ th_rtrn_ th_stdout_ th_stderr_
}

# Some shells, zsh on Solaris in particular, return immediately from a sub-shell
# when a non-zero return value is encountered. To properly catch these values,
# they are either written to disk, or recognized as an error the file is empty.
th_clearReturn() { cp /dev/null "${returnF}"; }
th_queryReturn() {
  if [ -s "${returnF}" ]; then
    th_return=`cat "${returnF}"`
  else
    th_return=${SHUNIT_ERROR}
  fi
  export th_return
}

# Providing external and internal calls to the showOutput helper function.
th_showOutput() { _th_showOutput "$@"; }
_th_showOutput() {
  if isSkipping; then
    return
  fi

  _th_return_="${1:-${returnF}}"
  _th_stdout_="${2:-${stdoutF}}"
  _th_stderr_="${3:-${stderrF}}"

  if [ "${_th_return_}" != "${SHUNIT_TRUE}" ]; then
    # shellcheck disable=SC2166
    if [ -n "${_th_stdout_}" -a -s "${_th_stdout_}" ]; then
      echo '>>> STDOUT' >&2
      cat "${_th_stdout_}" >&2
      echo '<<< STDOUT' >&2
    fi
    # shellcheck disable=SC2166
    if [ -n "${_th_stderr_}" -a -s "${_th_stderr_}" ]; then
      echo '>>> STDERR' >&2
      cat "${_th_stderr_}" >&2
      echo '<<< STDERR' >&2
    fi
  fi

  unset _th_return_ _th_stdout_ _th_stderr_
}

#
# Main.
#

${TRACE} 'trace output enabled'
${DEBUG} 'debug output enabled'