```sh
assert_false value [error message]
```
Used to validate the input is falsy.<br>
If the value is one of the following:
* No output
* false (case insensitive)
* 0
* no (case insensitive)
* Empty value
It is considered falsy.
#### Parameters
* The value to evaluate
* Optional error message
#### Return Value
**true** if falsy.
#### Examples
```sh
# valid conditions
assert_false
assert_false false
assert_false 0
assert_false false "This is my error message"
# error conditions (each one will break the execution)
assert_false ok
assert_false true
assert_false yes
value = set "some text"
assert_false ${value}
```