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+---
+title: "**echo**(1) acceptance tests"
+author: The Subplot project
+bindings: echo.yaml
+...
+
+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.
+
+No arguments
+=============================================================================
+
+Run `/bin/echo` without arguments.
+
+```subplot
+when user runs echo without arguments
+then exit code is 0
+and standard output contains a newline
+and standard error is empty
+```
+
+Hello, world
+=============================================================================
+
+This scenario runs `/bin/echo` to produce the output "hello, world".
+
+```subplot
+when user runs echo with arguments hello, world
+then exit code is 0
+and standard output contains "hello, world"
+and standard error is empty
+```