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