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+---
+title: "**echo**(1) acceptance tests"
+...
+# 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.
+```fable
+when user runs echo without arguments
+then exit code is 0
+and standard output contains a newline
+and standard error is empty
+```