Add unit tests for Prompter class methods #745

Job	Run time
copyright	3m 13s
shellcheck	3m 10s
build	5m 9s
checkstyle	3m 24s
cli/linux-amd64	4m 58s
javadoc	4m 1s
spotbugs	5m 22s
tests/cli-linux	5m 13s
cli/windows-amd64	6m 22s
tests/cli-functional-linux	6m 47s
cli/darwin-amd64	5m 35s
tests/archetype-linux	4m 47s
vscode-ext	4m 4s
tests/linker-linux	4m 39s
tests/others-linux	6m 17s
tests/cli-windows	6m 7s
tests/cli-functional-windows	7m 33s
tests/archetype-windows	5m 32s
tests/linker-windows	5m 47s
tests/others-windows	7m 58s
cli/binaries	8s
tests/results	5s
gate	1s
	1h 46m 12s

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