87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package readers
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import (
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"bytes"
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"io"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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// Check interface
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var _ io.ReadSeeker = &FakeSeeker{}
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func TestFakeSeeker(t *testing.T) {
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// Test that passing in an io.ReadSeeker just passes it through
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bufReader := bytes.NewReader([]byte{1})
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r := NewFakeSeeker(bufReader, 5)
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assert.Equal(t, r, bufReader)
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in := bytes.NewBufferString("hello")
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buf := make([]byte, 16)
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r = NewFakeSeeker(in, 5)
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assert.NotEqual(t, r, in)
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// check the seek offset is as passed in
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checkPos := func(pos int64) {
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abs, err := r.Seek(0, io.SeekCurrent)
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require.NoError(t, err)
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assert.Equal(t, pos, abs)
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}
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// Test some seeking
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checkPos(0)
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abs, err := r.Seek(2, io.SeekStart)
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require.NoError(t, err)
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assert.Equal(t, int64(2), abs)
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checkPos(2)
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abs, err = r.Seek(-1, io.SeekEnd)
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require.NoError(t, err)
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assert.Equal(t, int64(4), abs)
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checkPos(4)
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// Check can't read if not at start
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_, err = r.Read(buf)
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require.ErrorContains(t, err, "not at start")
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// Seek back to start
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abs, err = r.Seek(-4, io.SeekCurrent)
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require.NoError(t, err)
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assert.Equal(t, int64(0), abs)
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checkPos(0)
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_, err = r.Seek(42, 17)
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require.ErrorContains(t, err, "invalid whence")
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_, err = r.Seek(-1, io.SeekStart)
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require.ErrorContains(t, err, "negative position")
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// Test reading now seeked back to the start
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n, err := r.Read(buf)
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require.NoError(t, err)
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assert.Equal(t, 5, n)
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assert.Equal(t, []byte("hello"), buf[:5])
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// Seeking should give an error now
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_, err = r.Seek(-1, io.SeekEnd)
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require.ErrorContains(t, err, "after reading")
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}
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func TestFakeSeekerError(t *testing.T) {
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in := bytes.NewBufferString("hello")
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r := NewFakeSeeker(in, 5)
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assert.NotEqual(t, r, in)
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buf, err := io.ReadAll(r)
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require.NoError(t, err)
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assert.Equal(t, []byte("hello"), buf)
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_, err = r.Read(buf)
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assert.Equal(t, io.EOF, err)
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_, err = r.Seek(0, io.SeekStart)
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assert.Equal(t, io.EOF, err)
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}
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