echo(1) acceptance tests

The Fable project

Lars Wirzenius

Daniel Silverstone

0.2-56-g70d22ac

1 Introduction

echo(1) is a Unix command line tool, which writes its command line arguments to the standard output. This is a simple acceptance test suite for the /bin/echo implementation.

2 No arguments

Run /bin/echo without arguments.

when user runs echo without arguments
then exit code is 0
and standard output contains a newline
and standard error is empty

3 Hello, world

This scenario runs /bin/echo to produce the output “hello, world”.

when user runs echo with arguments hello, world
then exit code is 0
and standard output contains “hello, world
and standard error is empty