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The Discover tests step runs under set -euo pipefail, so when every Test function in a file is filtered out by the exclude regex (as with vnetperf_test.go, whose TestVnetPerf* tests need special invocation), the final grep -vE produces no output and exits 1, failing the whole step. Tolerate empty results from both greps so such files simply contribute no matrix entries. Same for a hypothetical future test file containing only helpers and no Test functions. Updates tailscale/corp#44805 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: If20c9a1de37e97b1553bd7d5559e2b876a45c19b