test/fast/Running 'nvm use system' should work as expected

#!/bin/sh

set -eux

cleanup() {
  unset -f nvm_has_system_node nvm_print_npm_version
}
die() { echo "$@" ; cleanup ; exit 1; }

\. ../../nvm.sh

nvm_has_system_node() { return 0; }
nvm_print_npm_version() { command printf ' (npm v1.2.3)'; }

EXPECTED_OUTPUT="Now using system version of node: $(node -v)$(nvm_print_npm_version)"
set +x # since stderr is needed
OUTPUT="$(nvm use system 2>&1)"
set -x
[ "${OUTPUT}" = "${EXPECTED_OUTPUT}" ] || die "Could not use system version of node. Got >${OUTPUT}<, expected >${EXPECTED_OUTPUT}<"

EXPECTED_OUTPUT=""
set +x # since stderr is needed
OUTPUT="$(nvm use --silent system 2>&1 | tail -1)"
set -x
[ "${OUTPUT}" = "${EXPECTED_OUTPUT}" ] || die "Could not use system version of node or --silent was not silent"

nvm_has_system_node() { return 1; }
nvm_print_npm_version() { command printf ''; }

EXPECTED_OUTPUT="System version of node not found."
set +x # since stderr is needed
OUTPUT="$(nvm use system 2>&1 | tail -1)"
set -x
[ "${OUTPUT}" = "${EXPECTED_OUTPUT}" ] || die "Did not report error, system node not found"

nvm use system 2>&1 > /dev/null || [ $? -eq 127 ] || die "Did not return error code, system node not found"
EXPECTED_OUTPUT=""
set +x # since stderr is needed
OUTPUT="$(nvm use --silent system 2>&1 | tail -1)"
set -x
[ "${OUTPUT}" = "${EXPECTED_OUTPUT}" ] || die "Did not report error, system node not found or --silent was not silent"
nvm use --silent system 2>&1 > /dev/null || [ $? -eq 127 ] || die "Did not return error code, system node not found or --silent was not silent"

cleanup