Tests: add fixture for single unused global

Author: sirbrillig

VariableAnalysis/Tests/CodeAnalysis/VariableAnalysisTest.php

@@ -95,7 +95,8 @@ public function testFunctionWithGlobalVarWarnings() {
       8,
       23,
       28,
-      29
+      29,
+      39,
     ];
     $this->assertEquals($expectedWarnings, $lines);
   }
@@ -734,6 +735,7 @@ public function testValidUndefinedVariableNamesIgnoresVarsInGlobalScope() {
       4,
       7,
       23,
+      39,
     ];
     $this->assertEquals($expectedWarnings, $lines);
   }

VariableAnalysis/Tests/CodeAnalysis/fixtures/FunctionWithGlobalVarFixture.php

@@ -34,3 +34,7 @@ function updateGlobal($newVal) {
   global $myGlobal;
   $myGlobal = $newVal;
 }
+
+function unusedGlobal() {
+  global $myGlobal; // should warn that var is unused
+}