tesh

tesh is a CLI tool and Go library used to test the output of shell commands.

⚠️ This is a very crude early proof of concept, use with caution.

A real life tesh test suite is used in the zk repository.

Build

You need a working Go installation to build tesh.

$ git clone https://github.com/mickael-menu/tesh.git
$ cd tesh
$ go install tesh.go

Usage

$ tesh <tests-dir> <working-dir>

Run all the .tesh files found in the tests-dir directory, recursively. The tests are run from a copy of the given working-dir, which can contain test fixtures.

$ tesh -u <tests-dir> <working-dir>

Update the .tesh files in place (stdout and stderr outputs) when encountering a failed test.

$ tesh -b <tests-dir> <working-dir>

Print raw bytes for the expected outputs, in case of failure. Useful for debugging whitespaces.

Syntax

A .tesh file represents a single tesh test case, but can contain several commands. Here's a complete example of a .tesh file:

# Test output on stdout
$ echo "hello\nworld"
>hello
>world

# Test output on stderr
1$ cat not-found
2>cat: not-found: No such file or directory

# Test input from stdin
$ cat -n
<Testing input
<on several lines
>     1	Testing input
>     2	on several lines

# Test exit code
42$ exit 42

Comments

Only single-line comments are supported, with #. End-of-line comments are not possible.

Commands

Each command must start with $, followed by a shell statement. You can use pipes and shell variables, as the statement will be passed to $SHELL -c.

An exit code of 0 is expected, unless you prefix the $ with a failure code, e.g. 1$ cat not-found.

cd command

The cd command is special with tesh, it needs to be on its own line and can't be combined with other commands (e.g. with && or |).

Input streams (stdin)

You can provide input for a command by prefixing it with <. Whitespaces after < are significant, including the final newline.

Output streams (stdout on stderr)

Use > for the expected output on stdout, or 2> for the expected output on stderr. Whitespaces after > are significant, including the final newline. If the command doesn't output a final newline, you can use a trailing \ to match the output.

Templates

Commands and streams can contain Handlebars statements. Some additional helpers are available

match helper (Regexes)

The match helper is useful to check for dynamic content, as you can use a regular expression to verify the content of an output stream.

$ uname -rs
>Darwin {{match '[0-9\.]+'}}

sh helper

The sh helper can be used to execute a shell command and expand its output in the template.

{{sh "echo 'Hello, world!'"}} -> Hello, world!
{{#sh "tr '[a-z]' '[A-Z]'"}}Hello, world!{{/sh}} -> HELLO, WORLD!

Character escaping

Some characters are significant in the commands and streams. If you want to use them literally, you must escape them with \:

• $, for example when used with shell environment variables.
• {{, as it is reserved for Handlebars templates.