34324031cb
Signed-off-by: Adrian Cole <adrian@tetrate.io> Signed-off-by: Edoardo Vacchi <evacchi@users.noreply.github.com> Co-authored-by: Edoardo Vacchi <evacchi@users.noreply.github.com>
139 lines
3.3 KiB
Go
139 lines
3.3 KiB
Go
package sys
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import (
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"io/fs"
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"os"
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"testing"
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"github.com/tetratelabs/wazero/internal/testing/require"
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)
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func TestStdio(t *testing.T) {
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// simulate regular file attached to stdin
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f, err := os.CreateTemp(t.TempDir(), "somefile")
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require.NoError(t, err)
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defer f.Close()
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stdin, err := stdinFile(os.Stdin)
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require.NoError(t, err)
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stdinStat, err := os.Stdin.Stat()
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require.NoError(t, err)
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stdinNil, err := stdinFile(nil)
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require.NoError(t, err)
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stdinFile, err := stdinFile(f)
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require.NoError(t, err)
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stdout, err := stdioWriterFile("stdout", os.Stdout)
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require.NoError(t, err)
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stdoutStat, err := os.Stdout.Stat()
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require.NoError(t, err)
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stdoutNil, err := stdioWriterFile("stdout", nil)
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require.NoError(t, err)
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stdoutFile, err := stdioWriterFile("stdout", f)
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require.NoError(t, err)
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stderr, err := stdioWriterFile("stderr", os.Stderr)
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require.NoError(t, err)
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stderrStat, err := os.Stderr.Stat()
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require.NoError(t, err)
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stderrNil, err := stdioWriterFile("stderr", nil)
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require.NoError(t, err)
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stderrFile, err := stdioWriterFile("stderr", f)
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require.NoError(t, err)
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tests := []struct {
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name string
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f *FileEntry
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// Depending on how the tests run, os.Stdin won't necessarily be a char
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// device. We compare against an os.File, to account for this.
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expectedType fs.FileMode
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}{
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{
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name: "stdin",
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f: stdin,
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expectedType: stdinStat.Mode().Type(),
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},
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{
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name: "stdin noop",
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f: stdinNil,
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expectedType: fs.ModeDevice,
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},
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{
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name: "stdin file",
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f: stdinFile,
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expectedType: 0, // normal file
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},
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{
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name: "stdout",
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f: stdout,
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expectedType: stdoutStat.Mode().Type(),
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},
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{
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name: "stdout noop",
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f: stdoutNil,
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expectedType: fs.ModeDevice,
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},
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{
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name: "stdout file",
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f: stdoutFile,
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expectedType: 0, // normal file
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},
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{
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name: "stderr",
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f: stderr,
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expectedType: stderrStat.Mode().Type(),
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},
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{
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name: "stderr noop",
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f: stderrNil,
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expectedType: fs.ModeDevice,
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},
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{
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name: "stderr file",
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f: stderrFile,
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expectedType: 0, // normal file
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},
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}
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for _, tt := range tests {
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tc := tt
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t.Run(tc.name+" Stat", func(t *testing.T) {
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st, errno := tc.f.File.Stat()
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require.EqualErrno(t, 0, errno)
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require.Equal(t, tc.expectedType, st.Mode&fs.ModeType)
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require.Equal(t, uint64(1), st.Nlink)
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// Fake times are needed to pass wasi-testsuite.
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// See https://github.com/WebAssembly/wasi-testsuite/blob/af57727/tests/rust/src/bin/fd_filestat_get.rs#L1-L19
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require.Zero(t, st.Ctim)
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require.Zero(t, st.Mtim)
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require.Zero(t, st.Atim)
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})
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buf := make([]byte, 5)
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switch tc.f {
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case stdinNil:
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t.Run(tc.name+" returns zero on Read", func(t *testing.T) {
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n, errno := tc.f.File.Read(buf)
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require.EqualErrno(t, 0, errno)
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require.Zero(t, n) // like reading io.EOF
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})
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case stdoutNil, stderrNil:
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// This is important because some code will loop forever attempting
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// to write data. This happened in TestShortHash.
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t.Run(tc.name+" returns length on Write", func(t *testing.T) {
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n, errno := tc.f.File.Write(buf)
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require.EqualErrno(t, 0, errno)
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require.Equal(t, len(buf), n) // like io.Discard
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})
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}
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}
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}
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