Add unit tests for Prompter class methods #744

Job	Run time
build	4m 59s
shellcheck	3m 6s
copyright	3m 15s
checkstyle	3m 28s
javadoc	4m 2s
spotbugs	5m 21s
cli/linux-amd64	4m 52s
cli/windows-amd64	5m 44s
tests/cli-linux	5m 10s
vscode-ext	3m 51s
cli/darwin-amd64	7m 57s
tests/cli-functional-linux	7m 6s
tests/archetype-linux	4m 47s
tests/linker-linux	4m 41s
tests/others-linux	5m 54s
tests/cli-windows	6m 21s
tests/cli-functional-windows	7m 50s
tests/archetype-windows	6m 25s
tests/linker-windows	5m 40s
tests/others-windows	7m 56s
cli/binaries	6s
tests/results	6s
gate	1s
	1h 48m 38s

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