add some scanner benchmarks

server/scanner/scanner_benchmark_test.go

@@ -0,0 +1,35 @@
+package scanner_test
+
+import (
+	"fmt"
+	"testing"
+
+	"go.senan.xyz/gonic/server/mockfs"
+)
+
+func BenchmarkScanIncremental(b *testing.B) {
+	m := mockfs.New(b)
+	defer m.CleanUp()
+	for i := 0; i < 5; i++ {
+		m.AddItemsPrefix(fmt.Sprintf("t-%d", i))
+	}
+	m.ScanAndClean()
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		m.ScanAndClean()
+	}
+}
+
+func BenchmarkScanFull(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		m := mockfs.New(b)
+		for i := 0; i < 5; i++ {
+			m.AddItemsPrefix(fmt.Sprintf("t-%d", i))
+		}
+		b.StartTimer()
+		m.ScanAndClean()
+		b.StopTimer()
+		m.CleanUp()
+	}
+}