Allow single test to be specified as an argument to run-nio-alloc-cou…

…nter-tests.sh. (#1214)

* Allow single test to be specified as an argument to run-nio-alloc-counter-tests.sh.

Motivation:

run-nio-alloc-counter-tests.sh currently runs all tests. When writing or
debugging a test, you commonly want to run a single test. At the moment the
common practice is to edit the script to hardcode a test to run, which is
annoying and error-prone.

Modifications:

Add an optional argument to the script to specify the test to run.

Result:

$ ./run-nio-alloc-counter-tests.sh

runs all tests.

$ ./run-nio-alloc-counter-tests.sh test_decode_1000_ws_frames.swift

runs only test_decode_1000_ws_frames.swift.

IntegrationTests/tests_04_performance/test_01_resources/run-nio-alloc-counter-tests.sh

@@ -18,25 +18,28 @@ here="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 tmp_dir="/tmp"
 
-function die() {
-    echo >&2 "ERROR: $*"
-    exit 1
-}
-
 while getopts "t:" opt; do
     case "$opt" in
         t)
             tmp_dir="$OPTARG"
             ;;
-        \?)
-            die "unknown option $opt"
+        *)
+            exit 1
             ;;
     esac
 done
 
+shift $((OPTIND-1))
+
+tests_to_run=("$here"/test_*.swift)
+
+if [[ $# -gt 0 ]]; then
+    tests_to_run=$@
+fi
+
 "$here/../../allocation-counter-tests-framework/run-allocation-counter.sh" \
     -p "$here/../../.." \
     -m NIO -m NIOHTTP1 -m NIOWebSocket \
     -s "$here/shared.swift" \
     -t "$tmp_dir" \
-    "$here"/test_*.swift
+    "${tests_to_run[@]}"