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|
package helper
import (
"context"
"io"
"testing"
"time"
"github.com/stretchr/testify/require"
)
type fakeReader struct {
n int
err error
}
func (f *fakeReader) Read(b []byte) (int, error) {
return f.n, f.err
}
type fakeContextWithTimeout struct {
n int
threshold int
}
func (*fakeContextWithTimeout) Deadline() (deadline time.Time, ok bool) {
return
}
func (*fakeContextWithTimeout) Done() <-chan struct{} {
return nil
}
func (*fakeContextWithTimeout) Value(key interface{}) interface{} {
return nil
}
func (f *fakeContextWithTimeout) Err() error {
f.n++
if f.n > f.threshold {
return context.DeadlineExceeded
}
return nil
}
func TestContextReaderRead(t *testing.T) {
underlyingReader := &fakeReader{n: 1, err: io.EOF}
for _, tc := range []struct {
desc string
ctx *fakeContextWithTimeout
expectedN int
expectedErr error
}{
{
desc: "Before and after read deadline checks are fine",
ctx: &fakeContextWithTimeout{n: 0, threshold: 2},
expectedN: underlyingReader.n,
expectedErr: underlyingReader.err,
},
{
desc: "Before read deadline check fails",
ctx: &fakeContextWithTimeout{n: 0, threshold: 0},
expectedN: 0,
expectedErr: context.DeadlineExceeded,
},
{
desc: "After read deadline check fails",
ctx: &fakeContextWithTimeout{n: 0, threshold: 1},
expectedN: underlyingReader.n,
expectedErr: context.DeadlineExceeded,
},
} {
t.Run(tc.desc, func(t *testing.T) {
cr := NewContextReader(tc.ctx, underlyingReader)
n, err := cr.Read(nil)
require.Equal(t, tc.expectedN, n)
require.Equal(t, tc.expectedErr, err)
})
}
}
|
