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fix: deflake BackedWriter tests#19802

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ibetitsmike merged 1 commit intomainfrommike/fix-backed-pipe-flake
Sep 12, 2025
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40 changes: 18 additions & 22 deletionsagent/immortalstreams/backedpipe/backed_writer_test.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -177,18 +177,12 @@ func TestBackedWriter_BlockOnWriteFailure(t *testing.T) {
// Expected - write is blocked
}

// Should be disconnected
// Wait for error event which implies writer was marked disconnected
receivedErrorEvent := testutil.RequireReceive(ctx, t, errChan)
require.Contains(t, receivedErrorEvent.Err.Error(), "write failed")
require.Equal(t, "writer", receivedErrorEvent.Component)
require.False(t, bw.Connected())

// Error should be sent to error channel
select {
case receivedErrorEvent := <-errChan:
require.Contains(t, receivedErrorEvent.Err.Error(), "write failed")
require.Equal(t, "writer", receivedErrorEvent.Component)
default:
t.Fatal("Expected error to be sent to error channel")
}

// Reconnect with working writer and verify write completes
writer2 := newMockWriter()
err = bw.Reconnect(0, writer2) // Replay from beginning
Expand All@@ -205,6 +199,7 @@ func TestBackedWriter_BlockOnWriteFailure(t *testing.T) {

func TestBackedWriter_ReplayOnReconnect(t *testing.T) {
t.Parallel()
ctx := testutil.Context(t, testutil.WaitShort)

errChan := make(chan backedpipe.ErrorEvent, 1)
bw := backedpipe.NewBackedWriter(backedpipe.DefaultBufferSize, errChan)
Expand DownExpand Up@@ -243,6 +238,10 @@ func TestBackedWriter_ReplayOnReconnect(t *testing.T) {
// Expected - write is blocked
}

// Wait for error event which implies writer was marked disconnected
receivedErrorEvent := testutil.RequireReceive(ctx, t, errChan)
require.Contains(t, receivedErrorEvent.Err.Error(), "connection lost")
require.Equal(t, "writer", receivedErrorEvent.Component)
require.False(t, bw.Connected())

// Reconnect with new writer and request replay from beginning
Expand DownExpand Up@@ -479,18 +478,12 @@ func TestBackedWriter_BlockOnPartialWrite(t *testing.T) {
// Expected - write is blocked
}

// Should be disconnected
// Wait for error event which implies writer was marked disconnected
receivedErrorEvent := testutil.RequireReceive(ctx, t, errChan)
require.Contains(t, receivedErrorEvent.Err.Error(), "short write")
require.Equal(t, "writer", receivedErrorEvent.Component)
require.False(t, bw.Connected())

// Error should be sent to error channel
select {
case receivedErrorEvent := <-errChan:
require.Contains(t, receivedErrorEvent.Err.Error(), "short write")
require.Equal(t, "writer", receivedErrorEvent.Component)
default:
t.Fatal("Expected error to be sent to error channel")
}

// Reconnect with working writer and verify write completes
writer2 := newMockWriter()
err := bw.Reconnect(0, writer2) // Replay from beginning
Expand DownExpand Up@@ -605,7 +598,10 @@ func TestBackedWriter_WriteBlocksAfterDisconnection(t *testing.T) {
// Expected - write is blocked
}

// Should be disconnected
// Wait for error event which implies writer was marked disconnected
receivedErrorEvent := testutil.RequireReceive(ctx, t, errChan)
require.Contains(t, receivedErrorEvent.Err.Error(), "connection lost")
require.Equal(t, "writer", receivedErrorEvent.Component)
require.False(t, bw.Connected())

// Reconnect and verify write completes
Expand DownExpand Up@@ -910,7 +906,7 @@ func TestBackedWriter_MultipleWritesDuringReconnect(t *testing.T) {
<-writesReadyTimer.C

// Start reconnection with controlled replay
replayStarted := make(chan struct{})
replayStarted := make(chan struct{}, 1)
replayCanComplete := make(chan struct{})
writer2 := &mockWriter{
writeFunc: func(p []byte) (int, error) {
Expand Down
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