diff --git a/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.2.inc b/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.2.inc
new file mode 100644
index 0000000000..1b572336b2
--- /dev/null
+++ b/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 
diff --git a/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.3.inc b/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.3.inc
new file mode 100644
index 0000000000..8b2baa7de2
--- /dev/null
+++ b/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,
diff --git a/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.4.inc b/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.4.inc
new file mode 100644
index 0000000000..df47a15c20
--- /dev/null
+++ b/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 $param) use
diff --git a/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.5.inc b/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.5.inc
new file mode 100644
index 0000000000..e4ddf5e476
--- /dev/null
+++ b/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.5.inc
@@ -0,0 +1,6 @@
+<?php
+
+// Intentional parse error/live coding.
+// Ensuring that the sniff ignores unfinished function declarations (missing close parenthesis for import use).
+// This must be the only test in this file.
+$closure = function (string $param) use ($var
diff --git a/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.6.inc b/src/Standards/Squiz/Tests/Functions/FunctionDeclarationArgumentSpacingUnitTest.6.inc
new file mode 100644
index 0000000000..7763b48d4c
--- /dev/null
+++ b/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