Ruleset::setSniffProperty(): add extra test with empty string as array value

Add tests for a scenario that I found on the WPCS codebase that I
believe was not documented in a test in PHPCS, and I'm not sure if it is
intentional or not. Also, not sure if it should be documented explicitly
 in the upgrade guide.

 https://github.com/WordPress/WordPress-Coding-Standards/blob/4d0160f32f8537f3cdf2e301433cb15641083963/WordPress/Tests/NamingConventions/PrefixAllGlobalsUnitTest.1.inc#L513

Co-authored-by: jrfnl <jrfnl@users.noreply.github.com>

Author: rodrigoprimo

tests/Core/Ruleset/Fixtures/PropertyTypeHandlingInline.inc

@@ -20,12 +20,12 @@
 // phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsBooleanFalseCase fALSe
 // phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsBooleanFalseTrimmed      false
 
-// phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsArrayWithOnlyValues[] string, 10, 1.5, null, true, false
-// phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsArrayWithKeysAndValues[] string=>string,10=>10,float=>1.5,null=>null,true=>true,false=>false
+// phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsArrayWithOnlyValues[] string, 10, 1.5, , null, true, false
+// phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsArrayWithKeysAndValues[] string=>string,10=>10,float=>1.5,=>,null=>null,true=>true,false=>false
 // phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsEmptyArray[]
 
-// phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsOldSchoolArrayWithOnlyValues[] string, 10, 1.5, null, true, false
-// phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsOldSchoolArrayWithKeysAndValues[] string=>string,10=>10,float=>1.5,null=>null,true=>true,false=>false
+// phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsOldSchoolArrayWithOnlyValues[] string, 10, 1.5, , null, true, false
+// phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsOldSchoolArrayWithKeysAndValues[] string=>string,10=>10,float=>1.5,=>,null=>null,true=>true,false=>false
 // phpcs:set TestStandard.SetProperty.PropertyTypeHandling expectsOldSchoolEmptyArray[]
 
 echo 'hello!';

tests/Core/Ruleset/PropertyTypeHandlingTest.php

@@ -120,6 +120,7 @@ public static function dataTypeHandling()
             'string',
             '10',
             '1.5',
+            '',
             'null',
             'true',
             'false',
@@ -128,6 +129,7 @@ public static function dataTypeHandling()
             'string' => 'string',
             10       => '10',
             'float'  => '1.5',
+            11       => '',
             'null'   => 'null',
             'true'   => 'true',
             'false'  => 'false',

tests/Core/Ruleset/PropertyTypeHandlingTest.xml

@@ -25,6 +25,7 @@
                 <element value="string"/>
                 <element value="10"/>
                 <element value="1.5"/>
+                <element value=""/>
                 <element value="null"/>
                 <element value="true"/>
                 <element value="false"/>
@@ -34,6 +35,7 @@
                 <element key="string" value="string"/>
                 <element key="10" value="10"/>
                 <element key="float" value="1.5"/>
+                <element key="" value=""/>
                 <element key="null" value="null"/>
                 <element key="true" value="true"/>
                 <element key="false" value="false"/>
@@ -60,9 +62,9 @@
 
             <property name="expectsEmptyArray" type="array"/>
 
-            <property name="expectsOldSchoolArrayWithOnlyValues" type="array" value="string, 10, 1.5, null, true, false" />
+            <property name="expectsOldSchoolArrayWithOnlyValues" type="array" value="string, 10, 1.5, , null, true, false" />
 
-            <property name="expectsOldSchoolArrayWithKeysAndValues" type="array" value="string=>string,10=>10,float=>1.5,null=>null,true=>true,false=>false" />
+            <property name="expectsOldSchoolArrayWithKeysAndValues" type="array" value="string=>string,10=>10,float=>1.5,=>,null=>null,true=>true,false=>false" />
 
             <property name="expectsOldSchoolArrayWithExtendedValues" type="array" value="string" />
             <property name="expectsOldSchoolArrayWithExtendedValues" type="array" extend="true" value="15,another string" />