test: run_tests.sh should just assume 8050 and 8051 (#1315)

Right now run_tests.sh assumes it has 8053 and 9991 without causing any
problems.  Start assuming we have 8050 and 8051 as well instead of
requiring people to pass them in.

test/nginx_system_test.sh

@@ -1184,7 +1184,7 @@ OUT=$($WGET_DUMP --header=Host:response-header-disable.example.com $URL)
 check_not_from "$OUT" egrep -qi 'addInstrumentationInit'
 
 # TODO(jmaessen, jefftk): Port proxying tests, which rely on pointing a
-# MapProxyDomain construct at a static server.  Perhaps localhost:8050 will
+# MapProxyDomain construct at a static server.  Perhaps $HOSTNAME will
 # serve, but the tests need to use different urls then.  For mod_pagespeed these
 # tests immediately precede the "scrape_secondary_stat" definition in
 # system_test.sh.

test/pagespeed_test.conf.template

@@ -232,7 +232,7 @@ http {
 
     # Block 6: Location block with proxy_cache directives.
     location /mod_pagespeed_test/cachable_rewritten_html/ {
-      # 1: Upstream PageSpeed server is running at localhost:8050.
+      # 1: Upstream PageSpeed server is running at localhost:@@PRIMARY_PORT@@.
       proxy_pass http://localhost:@@PRIMARY_PORT@@;
       # 2: Use htmlcache as the zone for caching.
       proxy_cache htmlcache;

test/run_tests.sh

@@ -23,12 +23,12 @@
 # Exits with status 2 if command line args are wrong.
 #
 # Usage:
-#   ./run_tests.sh primary_port secondary_port mod_pagespeed_dir ngx_binary
-#   pagespeed_test_host
-# Example:
-#   ./run_tests.sh 8050 8051 /path/to/mod_pagespeed /path/to/nginx/binary
-#   selfsigned.modpagespeed.com
+#   ./run_tests.sh /path/to/mod_pagespeed /path/to/nginx/binary
 #
+# By default the test script uses several ports.  If you have a port conflict
+# and need to override one you can do that by setting the relevant environment
+# variable.  For example:
+#   PRIMARY_PORT=1234 ./run_tests.sh /.../mod_pagespeed /.../nginx/binary
 
 # Normally we test only with the native fetcher off.  Set
 # TEST_NATIVE_FETCHER=true to also test the native fetcher, set
@@ -45,19 +45,19 @@ RUN_TESTS=${RUN_TESTS:-true}
 # true.
 USE_VALGRIND=${USE_VALGRIND:-false}
 
-if [ "$#" -ne 5 ] ; then
-  echo "Usage: $0 primary_port secondary_port mod_pagespeed_dir"
-  echo "  nginx_executable"
+if [ "$#" -ne 2 ] ; then
+  echo "Usage: $0 mod_pagespeed_dir nginx_executable"
   exit 2
 fi
 
-PRIMARY_PORT="$1"
-SECONDARY_PORT="$2"
-MOD_PAGESPEED_DIR="$3"
-NGINX_EXECUTABLE="$4"
-PAGESPEED_TEST_HOST="$5"
-CONTROLLER_PORT=8053
-RCPORT=9991
+MOD_PAGESPEED_DIR="$1"
+NGINX_EXECUTABLE="$2"
+
+: ${PRIMARY_PORT:=8050}
+: ${SECONDARY_PORT:=8051}
+: ${CONTROLLER_PORT:=8053}
+: ${RCPORT:=9991}
+: ${PAGESPEED_TEST_HOST:=selfsigned.modpagespeed.com}
 
 this_dir="$( cd $(dirname "$0") && pwd)"