Squiz/FunctionDeclarationArgumentSpacing: add parse error/live coding tests

Author: jrfnl

src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.2.inc

@@ -0,0 +1,6 @@
+<?php
+
+// Intentional parse error/live coding.
+// Ensuring that the sniff ignores unfinished function declarations (missing open parenthesis).
+// This must be the only test in this file.
+function 

src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.3.inc

@@ -0,0 +1,6 @@
+<?php
+
+// Intentional parse error/live coding.
+// Ensuring that the sniff ignores unfinished function declarations (missing close parenthesis).
+// This must be the only test in this file.
+$closure = function (string $paramA, int &...$paramB,

src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.4.inc

@@ -0,0 +1,6 @@
+<?php
+
+// Intentional parse error/live coding.
+// Ensuring that the sniff ignores unfinished function declarations (missing open parenthesis for import use).
+// This must be the only test in this file.
+$closure = function (string $param) use

src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.5.inc

@@ -0,0 +1,6 @@
+<?php
+
+// Intentional parse error/live coding.
+// Ensuring that the sniff ignores unfinished function declarations (missing close parenthesis for import use).
+// This must be the only test in this file.
+$closure = function (string $param) use ($var

src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.6.inc

@@ -0,0 +1,6 @@
+<?php
+
+// Intentional parse error/live coding.
+// Ensuring that the sniff ignores unfinished function declarations (missing close parenthesis).
+// This must be the only test in this file.
+$arrow = static fn (string $paramA