Fix #562: Prevent direct execution of test server script unless testing

tests/PHPCurlClass/server.php

@@ -1,4 +1,6 @@
 <?php
+// Prevent direct access unless testing.
+getenv('PHP_CURL_CLASS_TEST_MODE_ENABLED') === 'yes' || exit;
 
 require_once 'ContentRangeServer.php';
 require_once 'RangeHeader.php';

tests/before_script.sh

@@ -40,6 +40,9 @@ else
     fastcgi_pass="127.0.0.1:9000"
 fi
 
+# Let test server know we should allow testing.
+export PHP_CURL_CLASS_TEST_MODE_ENABLED="yes"
+
 if [[ "${TRAVIS_PHP_VERSION}" == "5.3" ]]; then
     if ! [ -x "$(command -v add-apt-repository)" ]; then
         $superuser apt-get install -y python-software-properties

tests/run.sh

@@ -3,6 +3,9 @@ cd "${SCRIPT_DIR}"
 
 set -x
 
+# Let test server know we should allow testing.
+export PHP_CURL_CLASS_TEST_MODE_ENABLED="yes"
+
 php -S 127.0.0.1:8000 -t PHPCurlClass/ &> /dev/null &
 pid="${!}"
 extra_args="${@}"