should be a.Call18, not a.Call17

Jint.Tests/Runtime/InteropTests.cs

@@ -1374,7 +1374,7 @@ namespace Jint.Tests.Runtime
             _engine.SetValue("a", new A());
             // Action<int>
             RunTest(@"
-                assert(a.Call17(function(value){ assert(value === 18); }));
+                assert(a.Call18(function(value){ assert(value === 18); }));
             ");
         }