Refined ApplicationContextInitializer assignability exception

(cherry picked from commit ca19920)

spring-webmvc/src/test/java/org/springframework/web/context/ContextLoaderTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -225,7 +225,7 @@ public class ContextLoaderTests {
 			listener.contextInitialized(new ServletContextEvent(sc));
 			fail("expected exception");
 		}
-		catch (IllegalArgumentException ex) {
+		catch (ApplicationContextException ex) {
 			assertTrue(ex.getMessage().contains("not assignable"));
 		}
 	}