Remove unused vendor/test-utils (#1043)

Since the unit tests instead use the utilities in this separate file:
https://github.com/heroku/heroku-buildpack-python/blob/419ef479969c4d5945f2c0620292229ef464f4c8/test/utils

A changelog entry has been added since whilst this file is for internal
testing only, the buildpack's `vendor/` directory is put on `PATH`, so
in theory it could have been called outside the buildpack (though this
seems extremely unlikely since the script isn't very useful externally).

Fixes #1027.
Closes @W-7918496@.

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Fix the security update version check message for apps using PyPy (#1040).
+- Remove `vendor/test-utils` (#1043).
 
 ## v175 (2020-08-05)
 

vendor/test-utils

@@ -1,204 +0,0 @@
-#!/bin/sh
-
-# taken from
-# https://github.com/ryanbrainard/heroku-buildpack-testrunner/blob/master/lib/test_utils.sh
-
-oneTimeSetUp()
-{
-   TEST_SUITE_CACHE="$(mktemp -d ${SHUNIT_TMPDIR}/test_suite_cache.XXXX)"
-}
-
-oneTimeTearDown()
-{
-  rm -rf ${TEST_SUITE_CACHE}
-}
-
-setUp()
-{
-  OUTPUT_DIR="$(mktemp -d ${SHUNIT_TMPDIR}/output.XXXX)"
-  STD_OUT="${OUTPUT_DIR}/stdout"
-  STD_ERR="${OUTPUT_DIR}/stderr"
-  BUILD_DIR="${OUTPUT_DIR}/build"
-  CACHE_DIR="${OUTPUT_DIR}/cache"
-  mkdir -p ${OUTPUT_DIR}
-  mkdir -p ${BUILD_DIR}
-  mkdir -p ${CACHE_DIR}
-}
-
-tearDown()
-{
-  rm -rf ${OUTPUT_DIR}
-}
-
-capture()
-{
-  resetCapture
-
-  LAST_COMMAND="$@"
-
-  "$@" >${STD_OUT} 2>${STD_ERR}
-  RETURN=$?
-  rtrn=${RETURN} # deprecated
-}
-
-resetCapture()
-{
-  if [ -f ${STD_OUT} ]; then
-    rm ${STD_OUT}
-  fi
-
-  if [ -f ${STD_ERR} ]; then
-    rm ${STD_ERR}
-  fi
-
-  unset LAST_COMMAND
-  unset RETURN
-  unset rtrn # deprecated
-}
-
-detect()
-{
-  capture ${BUILDPACK_HOME}/bin/detect ${BUILD_DIR}
-}
-
-compile()
-{
-  capture ${BUILDPACK_HOME}/bin/compile ${BUILD_DIR} ${CACHE_DIR}
-}
-
-release()
-{
-  capture ${BUILDPACK_HOME}/bin/release ${BUILD_DIR}
-}
-
-assertCapturedEquals()
-{
-  assertEquals "$@" "$(cat ${STD_OUT})"
-}
-
-assertCapturedNotEquals()
-{
-  assertNotEquals "$@" "$(cat ${STD_OUT})"
-}
-
-assertCaptured()
-{
-  assertFileContains "$@" "${STD_OUT}"
-}
-
-assertNotCaptured()
-{
-  assertFileNotContains "$@" "${STD_OUT}"
-}
-
-assertCapturedSuccess()
-{
-  assertEquals "Expected captured exit code to be 0; was <${RETURN}>" "0" "${RETURN}"
-  assertEquals "Expected STD_ERR to be empty; was <$(cat ${STD_ERR})>" "" "$(cat ${STD_ERR})"
-}
-
-# assertCapturedError [[expectedErrorCode] expectedErrorMsg]
-assertCapturedError()
-{
-  if [ $# -gt 1 ]; then
-    expectedErrorCode=${1}
-    shift
-  fi
-
-  expectedErrorMsg=${1:-""}
-
-  if [ -z ${expectedErrorCode} ]; then
-    assertTrue "Expected captured exit code to be greater than 0; was <${RETURN}>" "[ ${RETURN} -gt 0 ]"
-  else
-    assertTrue "Expected captured exit code to be <${expectedErrorCode}>; was <${RETURN}>" "[ ${RETURN} -eq ${expectedErrorCode} ]"
-  fi
-
-  assertFileContains "Expected STD_OUT to contain error <${expectedErrorMsg}>" "${expectedErrorMsg}" "${STD_OUT}"
-  assertEquals       "STD_ERR should always be empty" "" "$(cat ${STD_ERR})"
-}
-
-assertAppDetected()
-{
-  expectedAppType=${1?"Must provide app type"}
-
-  assertCapturedSuccess
-  assertEquals "${expectedAppType}" "$(cat ${STD_OUT})"
-}
-
-assertNoAppDetected()
-{
-  assertEquals "1" "${RETURN}"
-  assertEquals "no" "$(cat ${STD_OUT})"
-  assertEquals "" "$(cat ${STD_ERR})"
-}
-
-_assertContains()
-{
-  if [ 5 -eq $# ]; then
-    msg=$1
-    shift
-  elif [ ! 4 -eq $# ]; then
-    fail "Expected 4 or 5 parameters; Receieved $# parameters"
-  fi
-
-  needle=$1
-  haystack=$2
-  expectation=$3
-  haystack_type=$4
-
-  case "${haystack_type}" in
-    "file") grep -q -F -e "${needle}" ${haystack} ;;
-    "text") echo "${haystack}" | grep -q -F -e "${needle}" ;;
-  esac
-
-  if [ "${expectation}" != "$?" ]; then
-    case "${expectation}" in
-      0) default_msg="Expected <${haystack}> to contain <${needle}>" ;;
-      1) default_msg="Did not expect <${haystack}> to contain <${needle}>" ;;
-    esac
-
-    fail "${msg:-${default_msg}}"
-  fi
-}
-
-assertContains()
-{
-  _assertContains "$@" 0 "text"
-}
-
-assertNotContains()
-{
-  _assertContains "$@" 1 "text"
-}
-
-assertFileContains()
-{
-  _assertContains "$@" 0 "file"
-}
-
-assertFileNotContains()
-{
-  _assertContains "$@" 1 "file"
-}
-
-command_exists () {
-    type "$1" > /dev/null 2>&1 ;
-}
-
-assertFileMD5()
-{
-  expectedHash=$1
-  filename=$2
-
-  if command_exists "md5sum"; then
-    md5_cmd="md5sum ${filename}"
-    expected_md5_cmd_output="${expectedHash}  ${filename}"
-  elif command_exists "md5"; then
-    md5_cmd="md5 ${filename}"
-    expected_md5_cmd_output="MD5 (${filename}) = ${expectedHash}"
-  else
-    fail "no suitable MD5 hashing command found on this system"
-  fi
-
-  assertEquals "${expected_md5_cmd_output}" "`${md5_cmd}`"
-}