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/usr/lib/obs/tests/appliance/bash-tap is in obs-server 2.7.4-2.

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The actual contents of the file can be viewed below.

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#!/bin/bash

bash_tap_version='1.0.2'

# Our state.

_bt_plan=''
_bt_expected_tests=0
_bt_plan_output=0
_bt_current_test=0
_bt_tap_output=''
_bt_has_output_plan=0
_bt_done_testing=0
_bt_output_capture=0

# Our test results so far
unset _bt_test_ok
unset _bt_test_actual_ok
unset _bt_test_name
unset _bt_test_type
unset _bt_test_reason

# Cleanup stuff.
declare -a _bt_on_exit_cmds
trap "_bt_on_exit" EXIT

# Planning functions.

function _bt_output_plan() {
    local num_tests="$1"
    local directive="$2"
    local reason="$3"

    if [ "$_bt_has_output_plan" = 1 ]; then
        _caller_error "The plan was already output"
    fi

    _bt_clear_out
    _bt_out "1..$num_tests"
    if [ -n "$directive" ]; then
        _bt_out " # $directive"
    fi
    if [ -n "$reason" ]; then
        _bt_out " $reason"
    fi
    _bt_print_out
    _bt_has_output_plan=1
}

function plan() {
    local plan="$1"

    case "$plan" in
        no_plan)  no_plan             ;;
        skip_all) skip_all "$2"       ;;
        tests)    expected_tests "$2" ;;
        *)        _bt_die "Unknown or missing plan: '$plan'" ;;
    esac
}

function expected_tests() {
    local num="$1"

    if [ -z "$num" ]; then
        echo $_bt_expected_tests
    else
        if [ -n "$_bt_plan" ]; then
            _bt_caller_error "Plan is already defined"
        fi
        # TODO: validate
        _bt_plan="$num"
        _bt_expected_tests="$num"
        _bt_output_plan "$_bt_expected_tests"
    fi
}

function no_plan() {
    if [ -n "$_bt_plan" ]; then
        _bt_caller_error "Plan is already defined"
    fi
    _bt_plan="no plan"
}

function done_testing() {
    local num_tests="$1"

    if [ -z "$num_tests" ]; then
        num_tests="$_bt_current_test"
    fi

    if [ "$_bt_done_testing" = 1 ]; then
        _bt_caller_error "done_testing was already called"
    fi

    if [ "$_bt_expected_tests" != 0 -a "$num_tests" != "$_bt_expected_tests" ]; then
        ok 0 "planned to run $_bt_expected_tests but done_testing expects $num_tests"
    else
        _bt_expected_tests="$num_tests"
    fi

    if [ "$_bt_has_output_plan" = 0 ]; then
        _bt_plan="done testing"
        _bt_output_plan "$num_tests"
    fi
}

function has_plan() {
    test -n "$_bt_plan"
}

function skip_all() {
    local reason="${*:?}"

    _bt_output_plan 0 SKIP "$reason"
}

# Test functions.

function ok() {
    local result="$1"
    local name="$2"

    _bt_current_test=$((_bt_current_test + 1))

    # TODO: validate $name
    if [ -z "$name" ]; then
        name='unnamed test'
    fi
    name="${name//#/\\#}"

    _bt_clear_out
    if [ "$result" = 0 ]; then
        _bt_out "not ok"
        if [ -n "$TODO" ]; then
            _bt_test_ok[$_bt_current_test]=1
        else
            _bt_test_ok[$_bt_current_test]=0
        fi
        _bt_test_actual_ok[$_bt_current_test]=0
    else
        _bt_out "ok"
        _bt_test_ok[$_bt_current_test]=1
        _bt_test_actual_ok[$_bt_current_test]="$result"
    fi

    _bt_out " $_bt_current_test - $name"
    _bt_test_name[$_bt_current_test]="$name"

    if [ -n "$TODO" ]; then
        _bt_out " # TODO $TODO"
        _bt_test_reason[$_bt_current_test]="$TODO"
        _bt_test_type[$_bt_current_test]="todo"
    else
        _bt_test_reason[$_bt_current_test]=''
        _bt_test_type[$_bt_current_test]=''
    fi

    _bt_print_out
}

function _is_diag() {
    local result="$1"
    local expected="$2"

    diag "         got: '$result'"
    diag "    expected: '$expected'"
}

function is() {
    local result="$1"
    local expected="$2"
    local name="$3"

    if [ "$result" = "$expected" ]; then
        ok 1 "$name"
    else
        ok 0 "$name"
        _is_diag "$result" "$expected"
    fi
}

function _isnt_diag() {
    local result="$1"
    local expected="$2"

    diag "         got: '$result'"
    diag "    expected: anything else"
}

function isnt() {
    local result="$1"
    local expected="$2"
    local name="$3"

    if [ "$result" != "$expected" ]; then
        ok 1 "$name"
    else
        ok 0 "$name"
        _isnt_diag "$result" "$expected"
    fi
}

function like() {
    local result="$1"
    local pattern="$2"
    local name="$3"

    # NOTE: leave $pattern unquoted, see http://stackoverflow.com/a/218217/870000
    if [[ "$result" =~ $pattern ]]; then
        ok 1 "$name"
    else
        ok 0 "$name"
        diag "         got: '$result'"
        diag "    expected: match for '$pattern'"
    fi
}

function unlike() {
    local result="$1"
    local pattern="$2"
    local name="$3"

    # NOTE: leave $pattern unquoted, see http://stackoverflow.com/a/218217/870000
    if [[ ! "$result" =~ $pattern ]]; then
        ok 1 "$name"
    else
        ok 0 "$name"
        diag "         got: '$result'"
        diag "    expected: no match for '$pattern'"
    fi
}

function cmp_ok() {
    echo TODO
}

# Other helper functions

function BAIL_OUT() {
    echo "Bail out! $@"
    exit 255
}

function skip() {
    echo TODO
}

function todo_skip() {
    echo TODO
}

function todo_start() {
    echo TODO
}

function todo_end() {
    echo TODO
}

# Output

function diag() {
    local message="$1"

    if [ -n "$message" ]; then
        _bt_escaped_echo "# $message"
    fi
}

# Util functions for output capture within current shell

function start_output_capture() {
    if [ $_bt_output_capture = 1 ]; then
        finish_output_capture
        _bt_caller_error "Can't start output capture while already active"
    fi
    local stdout_tmpfile="/tmp/bash-itunes-test-out.$$"
    local stderr_tmpfile="/tmp/bash-itunes-test-err.$$"
    _bt_add_on_exit_cmd "rm -f '$stdout_tmpfile' '$stderr_tmpfile'"
    _bt_output_capture=1
    exec 3>&1 >$stdout_tmpfile 4>&2 2>$stderr_tmpfile
}

function finish_output_capture() {
    local capture_stdout_varname="$1"
    local capture_stderr_varname="$2"
    if [ $_bt_output_capture != 1 ]; then
        _bt_caller_error "Can't finish output capture when it wasn't started"
    fi
    exec 1>&3 3>&- 2>&4 4>&-
    _bt_output_capture=0
    if [ -n "$capture_stdout_varname" ]; then
        local stdout_tmpfile="/tmp/bash-itunes-test-out.$$"
        eval "$capture_stdout_varname=\$(< $stdout_tmpfile)"
    fi
    if [ -n "$capture_stderr_varname" ]; then
        local stderr_tmpfile="/tmp/bash-itunes-test-err.$$"
        eval "$capture_stderr_varname=\$(< $stderr_tmpfile)"
    fi
}

# Internals

function _bt_stdout() {
    echo "$@"
}

function _bt_stderr() {
    echo "$@" >&2
}

function _bt_die() {
    _bt_stderr "$@"
    exit 255
}

#  Report an error from the POV of the first calling point outside this file
function _bt_caller_error() {
    local message="$*"

    local thisfile="${BASH_SOURCE[0]}"
    local file="$thisfile"
    local frame_num=2
    until [ "$file" != "$thisfile" ]; do
        frame=$(caller "$frame_num")
        IFS=' ' read line func file <<<"$frame"
    done

    _bt_die "Error: $message, on line $line of $file"
}

#  Echo the supplied message with lines after the
#  first escaped as TAP comments.
function _bt_escaped_echo() {
    local message="$*"

    local output=''
    while IFS= read -r line; do
        output="$output\n# $line"
    done <<<"$message"
    echo -e "${output:4}"
}

function _bt_clear_out() {
    _bt_tap_output=""
}

function _bt_out() {
    _bt_tap_output="$_bt_tap_output$*"
}

function _bt_print_out() {
    _bt_escaped_echo "$_bt_tap_output"
}

#  Cleanup stuff
function _bt_add_on_exit_cmd() {
    _bt_on_exit_cmds[${#_bt_on_exit_cmds[*]}]="$*"
}

function _bt_on_exit() {
    if [ $_bt_output_capture = 1 ]; then
        finish_output_capture
    fi
    for exit_cmd in "${_bt_on_exit_cmds[@]}"; do
        diag "cleanup: $exit_cmd"
        eval "$exit_cmd"
    done
    # TODO: check that we've output a plan/results
}