Bash Testing

• Testing Bash applications by Nikita Sobolev；
• Testing Your Shell Scripts, with Bats by Tim Perry；
• xUnit Patterns：SUT（system under test）；

bats-core

• Bats Evaluation Process；
• echo $output >&3：将被测函数的输出打印到屏幕；
• 在被测函数的 echo 语句中不使用 *，避免进行 Filename Generation（被解释成当下目录的所有文件）；
• echo "$output" >&3：必须在 bats 命令行指定 -t 参数可以起作用；

Comparison

No.	tools	language	star	release	date	description
1	bats-core	Shell	355	1.1.0	July 2018	Bats
<1	bats	Shell	4905	0.4.0	Aug 2014	Bash Automated Testing System
2	bash_unit	Shell	79	1.6.1	Feb 2018	bash unit testing enterprise edition framework for professionals !
3	shunit2	Shell	527	2.1.7	Jan 2018	xUnit unit test framework
4	assert.sh	Shell	361	1.1	Feb 2015	bash unit testing framework
5	roundup	Shell	385	0.0.6	Jan 2015	eliminate bugs and weeds from shell scripts
6	shelltestrunner	Haskel	36	1.9	Jan 2018	Easy, repeatable testing of CLI programs/commands
7	bashtest	python	24	0.0.7	Aug 2016	UNIX command-line tool for testing bash/sh scripts
8	BeakerLib	Shell	11	1.17	May 2018	shell-level integration testing library

参考

• Unit testing for shell scripts @ stackoverflow；
• TAP（Test Anything Protocol）
• Unit Testing bash scripts @ stackoverflow；

it's possible to import (include, whatever) a procedure (function, whatever it's named) from an external file. That's the key to writing a testing script: you break up your script into independent procedures that can then be imported into both your running script and your testing script, and then you have your running script be as simple as possible.

This method is like dependency injection for scripts, and sounds reasonable.