diff --git a/.github/workflows/go-test-build.yml b/.github/workflows/go-test-build.yml
index c8d024d..f4ff3f0 100644
--- a/.github/workflows/go-test-build.yml
+++ b/.github/workflows/go-test-build.yml
@@ -30,6 +30,9 @@ jobs:
     - name: Test
       run: go test -v ./...
 
+    - name: Benchmark
+      run: go test -bench=. -count 5 ./...
+
   build:
     needs: test
     strategy:
diff --git a/parser/execute_test.go b/parser/execute_test.go
index 8da91f1..b6a9dfb 100644
--- a/parser/execute_test.go
+++ b/parser/execute_test.go
@@ -20,7 +20,7 @@ func TestExecuteSmall(t *testing.T) {
 		{opNoop, 2},
 	}
 	startdata := make([]int, 65536)
-	outputBuf := bufio.NewWriter(os.Stdout)
+	outputBuf := bufio.NewWriter(&bufferWriter{})
 	inputBuf := bufio.NewReader(strings.NewReader("no input."))
 	data := Execute(startdata, program, inputBuf, outputBuf)[:10]
 	want := []int{0, 0, 0, 0, 0, 0, 10, 0, 0, 0}
@@ -42,7 +42,7 @@ func TestTokeniseExecuteSmall(t *testing.T) {
   >[<+>-]< and move the bit counter
 -]`)))
 	startdata := make([]int, 65536)
-	outputBuf := bufio.NewWriter(os.Stdout)
+	outputBuf := bufio.NewWriter(&bufferWriter{})
 	inputBuf := bufio.NewReader(strings.NewReader("no input."))
 	data := Execute(startdata, program, inputBuf, outputBuf)[:10]
 	want := []int{0, 0, 0, 170, 0, 0, 0, 0, 0, 0}
@@ -51,3 +51,27 @@ func TestTokeniseExecuteSmall(t *testing.T) {
 		t.Errorf("got %v want %v", data, want)
 	}
 }
+
+type bufferWriter struct {
+	buf []byte
+}
+
+func (writer *bufferWriter) Write(p []byte) (int, error) {
+	writer.buf = append(writer.buf, p...)
+	return 0, nil
+}
+
+func BenchmarkExecute(b *testing.B) {
+	sourceFile, err := os.Open("../sample/pi-digits.bf")
+	if err != nil {
+		b.Errorf("error opening program: err:")
+	}
+	buff := bufio.NewReader(sourceFile)
+	inputBuf := bufio.NewReader(strings.NewReader("80\n"))
+	outputBuf := bufio.NewWriter(&bufferWriter{})
+	program, _ := Tokenise(buff)
+	for i := 0; i < b.N; i++ {
+		startdata := make([]int, 65536)
+		Execute(startdata, program, inputBuf, outputBuf)
+	}
+}
diff --git a/parser/tokenise_test.go b/parser/tokenise_test.go
index d0cff37..7ae7c27 100644
--- a/parser/tokenise_test.go
+++ b/parser/tokenise_test.go
@@ -3,6 +3,7 @@ package parser
 import (
 	"bufio"
 	"errors"
+	"os"
 	"reflect"
 	"strings"
 	"testing"
@@ -164,3 +165,15 @@ func TestTokeniseError(t *testing.T) {
 		})
 	}
 }
+
+func BenchmarkTokenise(b *testing.B) {
+	sourceFile, err := os.Open("../sample/pi-digits.bf")
+	if err != nil {
+		b.Errorf("error opening program: err:")
+	}
+	buff := bufio.NewReader(sourceFile)
+	for i := 0; i < b.N; i++ {
+		Tokenise(buff)
+
+	}
+}