Flaky Test: com.google.cloud.spanner.pgadapter.CopyInMockServerTest.testCopyInBatchPsqlWithError

The automated dependency reviewer bot detected a flaky test failure in PR #4759.

**Failed Test:** `com.google.cloud.spanner.pgadapter.CopyInMockServerTest.testCopyInBatchPsqlWithError`
**Failure Summary:** Test timed out after 30 seconds on ubuntu (21) while passing on all other platforms.
**Workflow Run:** https://github.com/GoogleCloudPlatform/pgadapter/actions/runs/32220656175

**Log Excerpt:**
```text
) UNKNOWN STEP 2026-08-19T05:56:23.8361357Z [WARNING] Tests run: 12, Failures: 0, Errors: 0, Skipped: 1, Time elapsed: 0.279 s -- in com.google.cloud.spanner.pgadapter.EmulatedPsqlMockServerTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8390399Z [INFO] Running com.google.cloud.spanner.pgadapter.wireoutput.NoticeResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8421133Z [INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.001 s -- in com.google.cloud.spanner.pgadapter.wireoutput.NoticeResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8450200Z [INFO] Running com.google.cloud.spanner.pgadapter.wireoutput.CloseResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8451980Z [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0 s -- in com.google.cloud.spanner.pgadapter.wireoutput.CloseResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8510226Z [INFO] Running com.google.cloud.spanner.pgadapter.wireoutput.CopyInResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8521031Z [INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.001 s -- in com.google.cloud.spanner.pgadapter.wireoutput.CopyInResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8522704Z [INFO] Running com.google.cloud.spanner.pgadapter.wireoutput.StartupMessageResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8524589Z [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0 s -- in com.google.cloud.spanner.pgadapter.wireoutput.StartupMessageResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8569973Z [INFO] Running com.google.cloud.spanner.pgadapter.wireoutput.RowDescriptionTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8591537Z [INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0 s -- in com.google.cloud.spanner.pgadapter.wireoutput.RowDescriptionTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8593172Z [INFO] Running com.google.cloud.spanner.pgadapter.wireoutput.AcceptSSLResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8594622Z [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0 s -- in com.google.cloud.spanner.pgadapter.wireoutput.AcceptSSLResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:23.8595602Z [INFO] Running com.google.cloud.spanner.pgadapter.wireoutput.ErrorResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.3671562Z [INFO] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.512 s -- in com.google.cloud.spanner.pgadapter.wireoutput.ErrorResponseTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.3673109Z [INFO] Running com.google.cloud.spanner.pgadapter.SSLMockServerTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.7817958Z [INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.413 s -- in com.google.cloud.spanner.pgadapter.SSLMockServerTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.7818922Z [INFO] Running com.google.cloud.spanner.pgadapter.utils.MutationWriterTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8041972Z [INFO] Tests run: 10, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.014 s -- in com.google.cloud.spanner.pgadapter.utils.MutationWriterTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8070180Z [INFO] Running com.google.cloud.spanner.pgadapter.utils.BinaryCopyParserTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8071906Z [INFO] Tests run: 18, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0 s -- in com.google.cloud.spanner.pgadapter.utils.BinaryCopyParserTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8123973Z [INFO] Running com.google.cloud.spanner.pgadapter.utils.CopyInParserTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8180794Z [INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0 s -- in com.google.cloud.spanner.pgadapter.utils.CopyInParserTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8252692Z [INFO] Running com.google.cloud.spanner.pgadapter.utils.StatementParserTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8311153Z ##[error]Exception in thread "Thread-1938" java.lang.RuntimeException: java.io.IOException: Pipe closed
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8313813Z [INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.001 s -- in com.google.cloud.spanner.pgadapter.utils.StatementParserTest
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8340490Z at com.google.cloud.spanner.pgadapter.utils.CsvCopyParserTest.lambda$testCanCreateIteratorWithHeader$0(CsvCopyParserTest.java:73)
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8360788Z at java.base/java.lang.Thread.run(Thread.java:1583)
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8361558Z Caused by: java.io.IOException: Pipe closed
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8362522Z at java.base/java.io.PipedInputStream.checkStateForReceive(PipedInputStream.java:266)
ubuntu (21) UNKNOWN STEP 2026-08-19T05:56:25.8363683Z at java.base/java.io.PipedInputStream.receive(PipedInputStream.java:232
```

This issue was automatically created by the dependency reviewer bot.

Start with CopyInMockServerTest.testCopyInBatchPsqlWithError and reproduce the failure using the Ubuntu 21 workflow run and its log excerpt. Trace the 30-second timeout and verify the test completes reliably without the reported failure or related pipe-closed error.

Written by the indexing model from the issue text.