diff --git a/test/ComposerRequireCheckerTest/UsedSymbolsLocator/LocateUsedSymbolsFromASTRootsTest.php b/test/ComposerRequireCheckerTest/UsedSymbolsLocator/LocateUsedSymbolsFromASTRootsTest.php
index a8a0ff11..7b96ae14 100644
--- a/test/ComposerRequireCheckerTest/UsedSymbolsLocator/LocateUsedSymbolsFromASTRootsTest.php
+++ b/test/ComposerRequireCheckerTest/UsedSymbolsLocator/LocateUsedSymbolsFromASTRootsTest.php
@@ -46,6 +46,7 @@ public function testInvokeReturnsSymbolsSorted(): void
     {
         $expectedSymbols = [
             'Doctrine\Common\Collections\ArrayCollection',
+            'Example\Library\foo',
             'FILTER_VALIDATE_URL',
             'filter_var',
             'Foo\Bar\Baz',
diff --git a/test/fixtures/unknownSymbols/src/OtherThing.php b/test/fixtures/unknownSymbols/src/OtherThing.php
index b74aa532..cdbbecb6 100644
--- a/test/fixtures/unknownSymbols/src/OtherThing.php
+++ b/test/fixtures/unknownSymbols/src/OtherThing.php
@@ -6,6 +6,9 @@
 
 use Foo\Bar\Baz;
 
+function foo() {
+}
+
 final class OtherThing
 {
     public function baz(Baz $baz)
@@ -18,5 +21,7 @@ public function baz(Baz $baz)
             $baz->value(),
             FILTER_VALIDATE_URL
         );
+
+        foo();
     }
 }