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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))
})
}
func TestSizeToLimit(t *testing.T) {
tests := []struct {
size int64
limit int64
name string
}{
{size: 1, limit: 104857600, name: "1b to 100mb"},
{size: 100, limit: 104857600, name: "100b to 100mb"},
{size: 104857600, limit: 104857600, name: "100mb to 100mb"},
{size: 1073741824, limit: 104857600, name: "1gb to 100mb"},
{size: 10737418240, limit: 1073741824, name: "10gb to 1gb"},
{size: 53687091200, limit: 5368709120, name: "50gb to 5gb"},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
require.Equal(t, test.limit, SizeToLimit(test.size))
})
}
}
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