@Override
    public String format( Boolean b, String... args ) {
        return super.format( b, "", "not" );
    }
Translates <code>false</code> to the word "not" and <code>true</code> to the empty word "".

<pre>
true:  ""
false: "not"
</pre>

<h1>Example:</h1>
<pre>
then().the_coffee_should_$_be_served( coffeeServed )
</pre>
<h2>Result:</h2>
<h3>coffeeServed == false</h3>
<pre>
then the coffee should not be served
</pre>
<h3>coffeeServed == true</h3>
<pre>
then the coffee should be served
</pre>
jgiven-core/src/main/java/com/tngtech/jgiven/format/NotFormatter.java