feat(go): add 100k ingest hardening baseline

go/vehicle-gateway/internal/loadsim/runner_test.go

@@ -0,0 +1,73 @@
+package loadsim
+
+import (
+	"context"
+	"net"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestRunnerDialsTargetConnectionsAndWritesFrames(t *testing.T) {
+	var writes atomic.Int64
+	var closed atomic.Int64
+	runner := Runner{
+		Dial: func(ctx context.Context, network, addr string) (net.Conn, error) {
+			return &recordingConn{
+				write: func(p []byte) (int, error) {
+					writes.Add(1)
+					return len(p), nil
+				},
+				close: func() error {
+					closed.Add(1)
+					return nil
+				},
+			}, nil
+		},
+	}
+
+	stats, err := runner.Run(context.Background(), Config{
+		Protocol:             ProtocolJT808,
+		Addr:                 "127.0.0.1:808",
+		Connections:          3,
+		ConnectRatePerSecond: 1000,
+		SendInterval:         time.Millisecond,
+		Duration:             5 * time.Millisecond,
+		Template:             "0200",
+	})
+	if err != nil {
+		t.Fatalf("Run() error = %v", err)
+	}
+
+	if stats.ConnectionsOpened != 3 {
+		t.Fatalf("ConnectionsOpened = %d, want 3", stats.ConnectionsOpened)
+	}
+	if stats.FramesWritten == 0 {
+		t.Fatalf("FramesWritten = 0, want at least one")
+	}
+	if writes.Load() != int64(stats.FramesWritten) {
+		t.Fatalf("recorded writes = %d, stats = %d", writes.Load(), stats.FramesWritten)
+	}
+	if closed.Load() != 3 {
+		t.Fatalf("closed = %d, want 3", closed.Load())
+	}
+}
+
+type recordingConn struct {
+	write func([]byte) (int, error)
+	close func() error
+}
+
+func (c *recordingConn) Read(p []byte) (int, error)         { return 0, context.Canceled }
+func (c *recordingConn) Write(p []byte) (int, error)        { return c.write(p) }
+func (c *recordingConn) Close() error                       { return c.close() }
+func (c *recordingConn) LocalAddr() net.Addr                { return testAddr("local") }
+func (c *recordingConn) RemoteAddr() net.Addr               { return testAddr("remote") }
+func (c *recordingConn) SetDeadline(t time.Time) error      { return nil }
+func (c *recordingConn) SetReadDeadline(t time.Time) error  { return nil }
+func (c *recordingConn) SetWriteDeadline(t time.Time) error { return nil }
+
+type testAddr string
+
+func (a testAddr) Network() string { return "tcp" }
+func (a testAddr) String() string  { return string(a) }