Issue #12261: Resolve Pitest suppression for EmptyForIteratorPadCheck

[Kevin222004]

Issue #12261: Resolve Pitest suppression for EmptyForIteratorPadCheck

killed two surviving mutation

checkstyle/.ci/pitest-suppressions/pitest-whitespace-suppressions.xml

Line 44 in ba8efc2

<description>replaced call to java/lang/String::toUpperCase with receiver</description>

and

checkstyle/.ci/pitest-suppressions/pitest-whitespace-suppressions.xml

Line 53 in ba8efc2

<description>replaced call to java/lang/String::trim with receiver</description>

[Kevin222004]

1. pitest report
   https://kevin222004.github.io/AfterChanges/com.puppycrawl.tools.checkstyle.checks.whitespace/EmptyForIteratorPadCheck.java.html
   Surviving Mutation: java/lang/String::trim with receiver → SURVIVED
   and
   Surviving Mutation: java/lang/String::toUpperCase with receiver → SURVIVED

2. Mutated code

1. trim --> our Surviving mutation is java/lang/String::trim with receiver → SURVIVED
   this trim function will remove the extra space added before or after
   while setting the property SPACEto option
   if we see the without mutation the code looks like.
   option = PadOption.valueOf(optionString.toUpperCase(Locale.ENGLISH));

2. toUppercase --> our Surviving mutation is java/lang/String::toUpperCase with receiver → SURVIVED
   this toUpperCase function will change the string as --> SPACE
   while setting the property space to option
   if we see the without mutation the code looks like.
   option = PadOption.valueOf(optionStr.trim());

but we can't remove or make any changes to this Method bcs enum has set to be like
SPACE so all the letter we set to option is must be in Uppercase

3. Analysis

a) the toUpperCase function and trim function will work here as like

<property name="option" value="  space"/>

as the output of this code we will get only SPACE which is good

b) if we remove the toUpperCase function and then try to set the property

<property name="option" value="space"/>

it will give us the error like

com.puppycrawl.tools.checkstyle.api.CheckstyleException: cannot initialize module TreeWalker
 - cannot initialize module ParenPad - Cannot set property 'option' to 'space'
        at com.puppycrawl.tools.checkstyle.Checker.setupChild(Checker.java:481)
error continue...

and similarly
if we remove the trim function the and set the property

<property name="option" value=" space "/>

it will give us the error like

com.puppycrawl.tools.checkstyle.api.CheckstyleException: cannot initialize module TreeWalker
 - cannot initialize module ParenPad - Cannot set property 'option' to ' space '
        at com.puppycrawl.tools.checkstyle.Checker.setupChild(Checker.java:481)
error continue...

4. How to kill this

a) currently in our testing case all the test case which are available
that all have set the property directly SPACE the usage of toUpperCase function
and trimfunction is nothing in all the condition thats why it is Mutated

now to kill this mutation i have create the test file with
space and SPACE so it will appear to code as SPACE
as know the usage of toUpperCase and trim come so the muattion will be killed
https://kevin222004.github.io/EmptyforIteratorPad/com.puppycrawl.tools.checkstyle.checks.whitespace/EmptyForIteratorPadCheck.java.html