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More txbuilder coverage (#472) #1573

Job	Run time
continuous-integration (ubuntu-latest, 3.11)	6m 15s
build (ubuntu-latest, 3.11)	1m 2s
build (ubuntu-latest, 3.9)	56s
build (ubuntu-latest, 3.10)	50s
build (ubuntu-latest, 3.12)	49s
build (ubuntu-latest, 3.13)	54s
build (macos-latest, 3.10)	1m 5s
build (macos-latest, 3.9)	1m 4s
build (macos-latest, 3.12)	1m 10s
build (macos-latest, 3.11)	1m 24s
build (macos-latest, 3.13)	58s
	16m 27s

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