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71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
//go:build !windows
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// +build !windows
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package twin
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import (
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"io"
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"os"
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"testing"
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"time"
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"gotest.tools/v3/assert"
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)
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// This test should replace TestInterruptableReader_blockedOnRead if or when
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// Windows catches up with the shutdown implementation.
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func TestInterruptableReader_blockedOnReadImmediate(t *testing.T) {
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// Make a pipe to read from and write to
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pipeReader, pipeWriter, err := os.Pipe()
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assert.NilError(t, err)
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// Make an interruptable reader
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testMe, err := newInterruptableReader(pipeReader)
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assert.NilError(t, err)
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assert.Assert(t, testMe != nil)
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// Start a thread that reads from the pipe
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type readResult struct {
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n int
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err error
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}
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readResultChan := make(chan readResult)
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go func() {
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defer func() {
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panicHandler("TestInterruptableReader_blockedOnReadImmediate()", recover())
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}()
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buffer := make([]byte, 1)
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n, err := testMe.Read(buffer)
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readResultChan <- readResult{n, err}
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}()
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// Give the reader thread some time to start waiting
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time.Sleep(100 * time.Millisecond)
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// Interrupt the reader
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testMe.Interrupt()
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// Wait for the reader thread to finish
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result := <-readResultChan
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// Check the result
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assert.Equal(t, result.n, 0)
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assert.Equal(t, result.err, io.EOF)
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// Another read should return EOF immediately
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buffer := make([]byte, 1)
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n, err := testMe.Read(buffer)
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assert.Equal(t, err, io.EOF)
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assert.Equal(t, n, 0)
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// Even if there are bytes, the interrupted reader should still return EOF
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n, err = pipeWriter.Write([]byte{42})
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assert.NilError(t, err)
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assert.Equal(t, n, 1)
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n, err = testMe.Read(buffer)
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assert.Equal(t, err, io.EOF)
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assert.Equal(t, n, 0)
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}
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