Write simple util [Bash Hackers Wiki]

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The one of the simplest way to check your bash/sh scripts is run it and check it output or run it and check the result. This tutorial shows how-to use [[https://github.com/pahaz/bashtest|bashtest]] tool for testing your scripts.

==== Write simple util ====

We have a simple **stat.sh** script:

<code>
#!/usr/bin/env bash

if [ -z "$1" ]
then
    DIR=./
else
    DIR=$1
fi

echo "Evaluate *.py statistics"
FILES=$(find $DIR -name '*.py' | wc -l)
LINES=$((find $DIR -name '*.py' -print0 | xargs -0 cat) | wc -l)
echo "PYTHON FILES: $FILES"
echo "PYTHON LINES: $LINES"
</code>

This script evaluate the number of python files and the number of python code lines in the files.
We can use it like **./stat.sh <dir>**

==== Create testsuit ====

Then make test suits for **stat.sh**. We make a directory **testsuit** which contain test python files.

**testsuit/main.py**
<code>
import foo
print(foo)
</code>

**testsuit/foo.py**
<code>
BAR = 1
BUZ = BAR + 2
</code>

Ok! Our test suit is ready! 
We have 2 python files which contains 4 lines of code.

==== Write bashtests ====

Lets write tests. We just write a shell command for testing our work.

Create file **tests.bashtest**:

<code>
$ ./stat.sh testsuit/
Evaluate *.py statistics
PYTHON FILES:        2
PYTHON LINES:        4

</code>

This is our test! This is simple. Try to run it.

<code>
# install bashtest if required!
$ pip install bashtest
</code>

<code>
# run tests
$ bashtest *.bashtest
1 items passed all tests:
   1 tests in tests.bashtest
1 tests in 1 items.
1 passed and 0 failed.
Test passed.
</code>

Thats all. We wrote one test. You can write more tests if you want.

<code>
$ ls testsuit/
foo.py  main.py

$ ./stat.sh testsuit/
Evaluate *.py statistics
PYTHON FILES:        2
PYTHON LINES:        4

</code>

And run tests again:

<code>
$ bashtest *.bashtest
1 items passed all tests:
   2 tests in tests.bashtest
2 tests in 1 items.
2 passed and 0 failed.
Test passed.
</code>

You can find more **.bashtest** examples in the [[https://github.com/pahaz/bashtest | bashtest github repo]]. You can also write your question or report a bug [[https://github.com/pahaz/bashtest/issues | here]].

Happy testing!