kill %1 in test is not robust enough

examples/run_test.sh

@@ -3,8 +3,10 @@
 PORT=8082
 
 ./sse_server.exe -p $PORT &
+PID=$!
+
 sleep 0.1
 ./sse_client.exe -p $PORT --alarm=1 /count | tr -d '\r' || true
 
-kill %1
+kill $PID
 echo "success"

tests/download_chunked.sh

@@ -3,11 +3,12 @@
 SERVER=$1
 PORT=8084
 "$SERVER" . -p $PORT &
+PID=$!
 
 sleep 0.1
 
 curl -N "http://localhost:${PORT}/foo_50" -o data2 \
   -H 'Tranfer-encoding: chunked'
 
-kill %1
+kill $PID
 wc data2

tests/echo1.sh

@@ -4,6 +4,7 @@ ECHO=$1
 PORT=8085
 
 "$ECHO" -p $PORT &
+PID=$!
 sleep 0.1
 curl -N "http://localhost:${PORT}/echo/?a=b&c=d" -H user-agent:test
-kill %1
+kill $PID

tests/sse_count.sh

@@ -4,7 +4,8 @@ SSE_SERVER=$1
 PORT=8086
 
 "$SSE_SERVER" -p $PORT &
+PID=$!
 sleep 0.1
 
 curl -N "http://localhost:${PORT}/count/10" -H user-agent:test
-kill %1
+kill $PID

tests/upload_chunked.sh

@@ -6,10 +6,11 @@ SERVER=$1
 PORT=8087
 
 "$SERVER" . -p $PORT --upload --max-upload 100000000000 &
+PID=$!
 
 sleep 0.1
 
 cat foo_50 | curl -N -X PUT http://localhost:$PORT/data --data-binary @- -H 'Transfer-Encoding: chunked'
 
-kill %1
+kill $PID
 wc data