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nginx-proxy/test/lib/bats/batslib.bash

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#
# batslib.bash
# ------------
#
# The Standard Library is a collection of test helpers intended to
# simplify testing. It contains the following types of test helpers.
#
# - Assertions are functions that perform a test and output relevant
# information on failure to help debugging. They return 1 on failure
# and 0 otherwise.
#
# All output is formatted for readability using the functions of
# `output.bash' and sent to the standard error.
#
source "${BATS_LIB}/batslib/output.bash"
########################################################################
# ASSERTIONS
########################################################################
# Fail and display a message. When no parameters are specified, the
# message is read from the standard input. Other functions use this to
# report failure.
#
# Globals:
# none
# Arguments:
# $@ - [=STDIN] message
# Returns:
# 1 - always
# Inputs:
# STDIN - [=$@] message
# Outputs:
# STDERR - message
fail() {
(( $# == 0 )) && batslib_err || batslib_err "$@"
return 1
}
# Fail and display details if the expression evaluates to false. Details
# include the expression, `$status' and `$output'.
#
# NOTE: The expression must be a simple command. Compound commands, such
# as `[[', can be used only when executed with `bash -c'.
#
# Globals:
# status
# output
# Arguments:
# $1 - expression
# Returns:
# 0 - expression evaluates to TRUE
# 1 - otherwise
# Outputs:
# STDERR - details, on failure
assert() {
if ! "$@"; then
{ local -ar single=(
'expression' "$*"
'status' "$status"
)
local -ar may_be_multi=(
'output' "$output"
)
local -ir width="$( batslib_get_max_single_line_key_width \
"${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
batslib_print_kv_single_or_multi "$width" "${may_be_multi[@]}"
} | batslib_decorate 'assertion failed' \
| fail
fi
}
# Fail and display details if the expected and actual values do not
# equal. Details include both values.
#
# Globals:
# none
# Arguments:
# $1 - actual value
# $2 - expected value
# Returns:
# 0 - values equal
# 1 - otherwise
# Outputs:
# STDERR - details, on failure
assert_equal() {
if [[ $1 != "$2" ]]; then
batslib_print_kv_single_or_multi 8 \
'expected' "$2" \
'actual' "$1" \
| batslib_decorate 'values do not equal' \
| fail
fi
}
# Fail and display details if `$status' is not 0. Details include
# `$status' and `$output'.
#
# Globals:
# status
# output
# Arguments:
# none
# Returns:
# 0 - `$status' is 0
# 1 - otherwise
# Outputs:
# STDERR - details, on failure
assert_success() {
if (( status != 0 )); then
{ local -ir width=6
batslib_print_kv_single "$width" 'status' "$status"
batslib_print_kv_single_or_multi "$width" 'output' "$output"
} | batslib_decorate 'command failed' \
| fail
fi
}
# Fail and display details if `$status' is 0. Details include `$output'.
#
# Optionally, when the expected status is specified, fail when it does
# not equal `$status'. In this case, details include the expected and
# actual status, and `$output'.
#
# Globals:
# status
# output
# Arguments:
# $1 - [opt] expected status
# Returns:
# 0 - `$status' is not 0, or
# `$status' equals the expected status
# 1 - otherwise
# Outputs:
# STDERR - details, on failure
assert_failure() {
(( $# > 0 )) && local -r expected="$1"
if (( status == 0 )); then
batslib_print_kv_single_or_multi 6 'output' "$output" \
| batslib_decorate 'command succeeded, but it was expected to fail' \
| fail
elif (( $# > 0 )) && (( status != expected )); then
{ local -ir width=8
batslib_print_kv_single "$width" \
'expected' "$expected" \
'actual' "$status"
batslib_print_kv_single_or_multi "$width" \
'output' "$output"
} | batslib_decorate 'command failed as expected, but status differs' \
| fail
fi
}
# Fail and display details if the expected does not match the actual
# output or a fragment of it.
#
# By default, the entire output is matched. The assertion fails if the
# expected output does not equal `$output'. Details include both values.
#
# When `-l <index>' is used, only the <index>-th line is matched. The
# assertion fails if the expected line does not equal
# `${lines[<index>}'. Details include the compared lines and <index>.
#
# When `-l' is used without the <index> argument, the output is searched
# for the expected line. The expected line is matched against each line
# in `${lines[@]}'. If no match is found the assertion fails. Details
# include the expected line and `$output'.
#
# By default, literal matching is performed. Options `-p' and `-r'
# enable partial (i.e. substring) and extended regular expression
# matching, respectively. Specifying an invalid extended regular
# expression with `-r' displays an error.
#
# Options `-p' and `-r' are mutually exclusive. When used
# simultaneously, an error is displayed.
#
# Globals:
# output
# lines
# Options:
# -l <index> - match against the <index>-th element of `${lines[@]}'
# -l - search `${lines[@]}' for the expected line
# -p - partial matching
# -r - extended regular expression matching
# Arguments:
# $1 - expected output
# Returns:
# 0 - expected matches the actual output
# 1 - otherwise
# Outputs:
# STDERR - details, on failure
# error message, on error
assert_output() {
local -i is_match_line=0
local -i is_match_contained=0
local -i is_mode_partial=0
local -i is_mode_regex=0
# Handle options.
while (( $# > 0 )); do
case "$1" in
-l)
if (( $# > 2 )) && [[ $2 =~ ^([0-9]|[1-9][0-9]+)$ ]]; then
is_match_line=1
local -ri idx="$2"
shift
else
is_match_contained=1;
fi
shift
;;
-p) is_mode_partial=1; shift ;;
-r) is_mode_regex=1; shift ;;
--) break ;;
*) break ;;
esac
done
if (( is_match_line )) && (( is_match_contained )); then
echo "\`-l' and \`-l <index>' are mutually exclusive" \
| batslib_decorate 'ERROR: assert_output' \
| fail
return $?
fi
if (( is_mode_partial )) && (( is_mode_regex )); then
echo "\`-p' and \`-r' are mutually exclusive" \
| batslib_decorate 'ERROR: assert_output' \
| fail
return $?
fi
# Arguments.
local -r expected="$1"
if (( is_mode_regex == 1 )) && [[ '' =~ $expected ]] || (( $? == 2 )); then
echo "Invalid extended regular expression: \`$expected'" \
| batslib_decorate 'ERROR: assert_output' \
| fail
return $?
fi
# Matching.
if (( is_match_contained )); then
# Line contained in output.
if (( is_mode_regex )); then
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
[[ ${lines[$idx]} =~ $expected ]] && return 0
done
{ local -ar single=(
'regex' "$expected"
)
local -ar may_be_multi=(
'output' "$output"
)
local -ir width="$( batslib_get_max_single_line_key_width \
"${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
batslib_print_kv_single_or_multi "$width" "${may_be_multi[@]}"
} | batslib_decorate 'no output line matches regular expression' \
| fail
elif (( is_mode_partial )); then
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
[[ ${lines[$idx]} == *"$expected"* ]] && return 0
done
{ local -ar single=(
'substring' "$expected"
)
local -ar may_be_multi=(
'output' "$output"
)
local -ir width="$( batslib_get_max_single_line_key_width \
"${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
batslib_print_kv_single_or_multi "$width" "${may_be_multi[@]}"
} | batslib_decorate 'no output line contains substring' \
| fail
else
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
[[ ${lines[$idx]} == "$expected" ]] && return 0
done
{ local -ar single=(
'line' "$expected"
)
local -ar may_be_multi=(
'output' "$output"
)
local -ir width="$( batslib_get_max_single_line_key_width \
"${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
batslib_print_kv_single_or_multi "$width" "${may_be_multi[@]}"
} | batslib_decorate 'output does not contain line' \
| fail
fi
elif (( is_match_line )); then
# Specific line.
if (( is_mode_regex )); then
if ! [[ ${lines[$idx]} =~ $expected ]]; then
batslib_print_kv_single 5 \
'index' "$idx" \
'regex' "$expected" \
'line' "${lines[$idx]}" \
| batslib_decorate 'regular expression does not match line' \
| fail
fi
elif (( is_mode_partial )); then
if [[ ${lines[$idx]} != *"$expected"* ]]; then
batslib_print_kv_single 9 \
'index' "$idx" \
'substring' "$expected" \
'line' "${lines[$idx]}" \
| batslib_decorate 'line does not contain substring' \
| fail
fi
else
if [[ ${lines[$idx]} != "$expected" ]]; then
batslib_print_kv_single 8 \
'index' "$idx" \
'expected' "$expected" \
'actual' "${lines[$idx]}" \
| batslib_decorate 'line differs' \
| fail
fi
fi
else
# Entire output.
if (( is_mode_regex )); then
if ! [[ $output =~ $expected ]]; then
batslib_print_kv_single_or_multi 6 \
'regex' "$expected" \
'output' "$output" \
| batslib_decorate 'regular expression does not match output' \
| fail
fi
elif (( is_mode_partial )); then
if [[ $output != *"$expected"* ]]; then
batslib_print_kv_single_or_multi 9 \
'substring' "$expected" \
'output' "$output" \
| batslib_decorate 'output does not contain substring' \
| fail
fi
else
if [[ $output != "$expected" ]]; then
batslib_print_kv_single_or_multi 8 \
'expected' "$expected" \
'actual' "$output" \
| batslib_decorate 'output differs' \
| fail
fi
fi
fi
}
# Fail and display details if the unexpected matches the actual output
# or a fragment of it.
#
# By default, the entire output is matched. The assertion fails if the
# unexpected output equals `$output'. Details include `$output'.
#
# When `-l <index>' is used, only the <index>-th line is matched. The
# assertion fails if the unexpected line equals `${lines[<index>}'.
# Details include the compared line and <index>.
#
# When `-l' is used without the <index> argument, the output is searched
# for the unexpected line. The unexpected line is matched against each
# line in `${lines[<index>]}'. If a match is found the assertion fails.
# Details include the unexpected line, the index where it was found and
# `$output' (with the unexpected line highlighted in it if `$output` is
# longer than one line).
#
# By default, literal matching is performed. Options `-p' and `-r'
# enable partial (i.e. substring) and extended regular expression
# matching, respectively. On failure, the substring or the regular
# expression is added to the details (if not already displayed).
# Specifying an invalid extended regular expression with `-r' displays
# an error.
#
# Options `-p' and `-r' are mutually exclusive. When used
# simultaneously, an error is displayed.
#
# Globals:
# output
# lines
# Options:
# -l <index> - match against the <index>-th element of `${lines[@]}'
# -l - search `${lines[@]}' for the unexpected line
# -p - partial matching
# -r - extended regular expression matching
# Arguments:
# $1 - unexpected output
# Returns:
# 0 - unexpected matches the actual output
# 1 - otherwise
# Outputs:
# STDERR - details, on failure
# error message, on error
refute_output() {
local -i is_match_line=0
local -i is_match_contained=0
local -i is_mode_partial=0
local -i is_mode_regex=0
# Handle options.
while (( $# > 0 )); do
case "$1" in
-l)
if (( $# > 2 )) && [[ $2 =~ ^([0-9]|[1-9][0-9]+)$ ]]; then
is_match_line=1
local -ri idx="$2"
shift
else
is_match_contained=1;
fi
shift
;;
-L) is_match_contained=1; shift ;;
-p) is_mode_partial=1; shift ;;
-r) is_mode_regex=1; shift ;;
--) break ;;
*) break ;;
esac
done
if (( is_match_line )) && (( is_match_contained )); then
echo "\`-l' and \`-l <index>' are mutually exclusive" \
| batslib_decorate 'ERROR: refute_output' \
| fail
return $?
fi
if (( is_mode_partial )) && (( is_mode_regex )); then
echo "\`-p' and \`-r' are mutually exclusive" \
| batslib_decorate 'ERROR: refute_output' \
| fail
return $?
fi
# Arguments.
local -r unexpected="$1"
if (( is_mode_regex == 1 )) && [[ '' =~ $unexpected ]] || (( $? == 2 )); then
echo "Invalid extended regular expression: \`$unexpected'" \
| batslib_decorate 'ERROR: refute_output' \
| fail
return $?
fi
# Matching.
if (( is_match_contained )); then
# Line contained in output.
if (( is_mode_regex )); then
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
if [[ ${lines[$idx]} =~ $unexpected ]]; then
{ local -ar single=(
'regex' "$unexpected"
'index' "$idx"
)
local -a may_be_multi=(
'output' "$output"
)
local -ir width="$( batslib_get_max_single_line_key_width \
"${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
if batslib_is_single_line "${may_be_multi[1]}"; then
batslib_print_kv_single "$width" "${may_be_multi[@]}"
else
may_be_multi[1]="$( printf '%s' "${may_be_multi[1]}" \
| batslib_prefix \
| batslib_mark '>' "$idx" )"
batslib_print_kv_multi "${may_be_multi[@]}"
fi
} | batslib_decorate 'no line should match the regular expression' \
| fail
return $?
fi
done
elif (( is_mode_partial )); then
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
if [[ ${lines[$idx]} == *"$unexpected"* ]]; then
{ local -ar single=(
'substring' "$unexpected"
'index' "$idx"
)
local -a may_be_multi=(
'output' "$output"
)
local -ir width="$( batslib_get_max_single_line_key_width \
"${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
if batslib_is_single_line "${may_be_multi[1]}"; then
batslib_print_kv_single "$width" "${may_be_multi[@]}"
else
may_be_multi[1]="$( printf '%s' "${may_be_multi[1]}" \
| batslib_prefix \
| batslib_mark '>' "$idx" )"
batslib_print_kv_multi "${may_be_multi[@]}"
fi
} | batslib_decorate 'no line should contain substring' \
| fail
return $?
fi
done
else
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
if [[ ${lines[$idx]} == "$unexpected" ]]; then
{ local -ar single=(
'line' "$unexpected"
'index' "$idx"
)
local -a may_be_multi=(
'output' "$output"
)
local -ir width="$( batslib_get_max_single_line_key_width \
"${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
if batslib_is_single_line "${may_be_multi[1]}"; then
batslib_print_kv_single "$width" "${may_be_multi[@]}"
else
may_be_multi[1]="$( printf '%s' "${may_be_multi[1]}" \
| batslib_prefix \
| batslib_mark '>' "$idx" )"
batslib_print_kv_multi "${may_be_multi[@]}"
fi
} | batslib_decorate 'line should not be in output' \
| fail
return $?
fi
done
fi
elif (( is_match_line )); then
# Specific line.
if (( is_mode_regex )); then
if [[ ${lines[$idx]} =~ $unexpected ]] || (( $? == 0 )); then
batslib_print_kv_single 5 \
'index' "$idx" \
'regex' "$unexpected" \
'line' "${lines[$idx]}" \
| batslib_decorate 'regular expression should not match line' \
| fail
fi
elif (( is_mode_partial )); then
if [[ ${lines[$idx]} == *"$unexpected"* ]]; then
batslib_print_kv_single 9 \
'index' "$idx" \
'substring' "$unexpected" \
'line' "${lines[$idx]}" \
| batslib_decorate 'line should not contain substring' \
| fail
fi
else
if [[ ${lines[$idx]} == "$unexpected" ]]; then
batslib_print_kv_single 5 \
'index' "$idx" \
'line' "${lines[$idx]}" \
| batslib_decorate 'line should differ' \
| fail
fi
fi
else
# Entire output.
if (( is_mode_regex )); then
if [[ $output =~ $unexpected ]] || (( $? == 0 )); then
batslib_print_kv_single_or_multi 6 \
'regex' "$unexpected" \
'output' "$output" \
| batslib_decorate 'regular expression should not match output' \
| fail
fi
elif (( is_mode_partial )); then
if [[ $output == *"$unexpected"* ]]; then
batslib_print_kv_single_or_multi 9 \
'substring' "$unexpected" \
'output' "$output" \
| batslib_decorate 'output should not contain substring' \
| fail
fi
else
if [[ $output == "$unexpected" ]]; then
batslib_print_kv_single_or_multi 6 \
'output' "$output" \
| batslib_decorate 'output equals, but it was expected to differ' \
| fail
fi
fi
fi
}