--- /dev/null
+package pkg
+
+import (
+ "bytes"
+ "io"
+ "io/ioutil"
+ "testing"
+)
+
+type countReadSeeker struct {
+ io.ReadSeeker
+ N int64
+}
+
+func (rs *countReadSeeker) Read(buf []byte) (int, error) {
+ n, err := rs.ReadSeeker.Read(buf)
+ rs.N += int64(n)
+ return n, err
+}
+
+func TestFoo(t *testing.T) {
+ r := bytes.NewReader([]byte("Hello, world!"))
+ cr := &countReadSeeker{ReadSeeker: r}
+ ioutil.ReadAll(cr)
+ if cr.N != 13 {
+ t.Errorf("got %d, want 13", cr.N)
+ }
+}
+
+var sink int
+
+func BenchmarkFoo(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ sink = fn()
+ }
+}
+
+func fn() int { return 0 }