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package limit
import (
"strings"
"testing"
"github.com/stretchr/testify/require"
)
func TestReadAt(t *testing.T) {
t.Run("when limit has not been reached", func(t *testing.T) {
r := strings.NewReader("some string to read")
buf := make([]byte, 11)
reader := NewLimitedReaderAt(r, 32, func(n int64) {
require.Zero(t, n)
})
p, err := reader.ReadAt(buf, 0)
require.NoError(t, err)
require.Equal(t, 11, p)
require.Equal(t, "some string", string(buf))
})
t.Run("when read limit is exceeded", func(t *testing.T) {
r := strings.NewReader("some string to read")
buf := make([]byte, 11)
reader := NewLimitedReaderAt(r, 9, func(n int64) {
require.Equal(t, 9, int(n))
})
p, err := reader.ReadAt(buf, 0)
require.Error(t, err)
require.Equal(t, 9, p)
require.Equal(t, "some stri\x00\x00", string(buf))
})
t.Run("when offset is higher than a limit", func(t *testing.T) {
r := strings.NewReader("some string to read")
buf := make([]byte, 4)
reader := NewLimitedReaderAt(r, 5, func(n int64) {
require.Zero(t, n)
})
p, err := reader.ReadAt(buf, 15)
require.NoError(t, err)
require.Equal(t, 4, p)
require.Equal(t, "read", string(buf))
})
t.Run("when a read starts at the limit", func(t *testing.T) {
r := strings.NewReader("some string to read")
buf := make([]byte, 11)
reader := NewLimitedReaderAt(r, 10, func(n int64) {
require.Equal(t, 10, int(n))
})
reader.ReadAt(buf, 0)
p, err := reader.ReadAt(buf, 0)
require.EqualError(t, err, ErrLimitExceeded.Error())
require.Equal(t, 0, p)
require.Equal(t, "some strin\x00", string(buf))
})
}
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