Add e2e tests

benchmark.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+RUNS=20
+CMD="go run ./cmd/cli -U http://localhost:80 -r 1_000_000 -c 100"
+
+declare -a times_default
+declare -a times_gogcoff
+
+echo "===== Benchmark: default GC ====="
+for i in $(seq 1 $RUNS); do
+    echo "Run $i/$RUNS ..."
+    start=$(date +%s%N)
+    $CMD
+    end=$(date +%s%N)
+    elapsed=$(( (end - start) / 1000000 )) # milliseconds
+    times_default+=("$elapsed")
+    echo "  -> ${elapsed} ms"
+done
+
+echo ""
+echo "===== Benchmark: GOGC=off ====="
+for i in $(seq 1 $RUNS); do
+    echo "Run $i/$RUNS ..."
+    start=$(date +%s%N)
+    GOGC=off $CMD
+    end=$(date +%s%N)
+    elapsed=$(( (end - start) / 1000000 ))
+    times_gogcoff+=("$elapsed")
+    echo "  -> ${elapsed} ms"
+done
+
+echo ""
+echo "============================================"
+echo "                 RESULTS"
+echo "============================================"
+
+echo ""
+echo "--- Default GC ---"
+sum=0
+for i in $(seq 0 $((RUNS - 1))); do
+    echo "  Run $((i + 1)): ${times_default[$i]} ms"
+    sum=$((sum + times_default[$i]))
+done
+avg_default=$((sum / RUNS))
+echo "  Average: ${avg_default} ms"
+
+echo ""
+echo "--- GOGC=off ---"
+sum=0
+for i in $(seq 0 $((RUNS - 1))); do
+    echo "  Run $((i + 1)): ${times_gogcoff[$i]} ms"
+    sum=$((sum + times_gogcoff[$i]))
+done
+avg_gogcoff=$((sum / RUNS))
+echo "  Average: ${avg_gogcoff} ms"
+
+echo ""
+echo "--- Comparison ---"
+if [ "$avg_default" -gt 0 ]; then
+    diff=$((avg_default - avg_gogcoff))
+    echo "  Difference: ${diff} ms (positive = GOGC=off is faster)"
+fi
+echo "============================================"