Generic/CyclomaticComplexity: improve code coverage

src/Standards/Generic/Sniffs/Metrics/CyclomaticComplexitySniff.php

@@ -60,7 +60,7 @@ public function process(File $phpcsFile, $stackPtr)
     {
         $tokens = $phpcsFile->getTokens();
 
-        // Ignore abstract methods.
+        // Ignore abstract and interface methods. Bail early when live coding.
         if (isset($tokens[$stackPtr]['scope_opener']) === false) {
             return;
         }

src/Standards/Generic/Tests/Metrics/CyclomaticComplexityUnitTest.1.inc

@@ -451,4 +451,10 @@ function complexityElevenWithNullSafeOperator()
     $bits = $object5->getX()?->getY()?->getZ();
 }
 
-?>
+abstract class AbstractClass {
+    abstract public function sniffShouldIgnoreAbstractMethods();
+}
+
+interface MyInterface {
+    public function sniffShouldIgnoreInterfaceMethods();
+}

src/Standards/Generic/Tests/Metrics/CyclomaticComplexityUnitTest.2.inc

@@ -0,0 +1,7 @@
+<?php
+
+// Intentional parse error (missing opening curly bracket).
+// This should be the only test in this file.
+// Testing that the sniff is *not* triggered.
+
+function sniffShouldBailMissingScopeOpener()