feat: Add benchmark tests

.gitignore

@@ -0,0 +1 @@
+benchmark

benchresults.txt

@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/Serares/coolStats
+BenchmarkRun-16    	      10	 326633135 ns/op
+PASS
+ok  	github.com/Serares/coolStats	3.594s

csv_test.go

@@ -45,8 +45,8 @@ func TestCSV2Float(t *testing.T) {
 	192.168.0.88,899,220
 	192.168.0.199,3054,226
 	192.168.0.100,4133,218
-	192.168.0.199,950,238
+	192.168.0.199,950,238`
-	`
+
 	testCases := []struct {
 		name   string
 		col    int

main_test.go

@@ -3,7 +3,9 @@ package main
 import (
 	"bytes"
 	"errors"
+	"io"
 	"os"
+	"path/filepath"
 	"testing"
 )
 
@@ -65,3 +67,17 @@ func TestRun(t *testing.T) {
 		})
 	}
 }
+
+func BenchmarkRun(b *testing.B) {
+	filenames, err := filepath.Glob("./testdata/benchmark/*.csv")
+	if err != nil {
+		b.Fatal(err)
+	}
+	// reset the time before running the benchmark loop
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if err := run(filenames, "avg", 2, io.Discard); err != nil {
+			b.Error(err)
+		}
+	}
+}