Polishing

Author: sbrannen

spring-test/src/main/java/org/springframework/test/context/transaction/TestContextTransactionUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -205,13 +205,10 @@ public static PlatformTransactionManager retrieveTransactionManager(TestContext
 						"Only one TransactionManagementConfigurer may exist in the ApplicationContext");
 				if (configurers.size() == 1) {
 					TransactionManager tm = configurers.values().iterator().next().annotationDrivenTransactionManager();
-					if (tm instanceof PlatformTransactionManager) {
-						return (PlatformTransactionManager) tm;
-					}
-					else {
-						throw new IllegalStateException(
-								"Specified transaction manager is not a PlatformTransactionManager: " + tm);
-					}
+					Assert.state(tm instanceof PlatformTransactionManager, () ->
+						"Transaction manager specified via TransactionManagementConfigurer " +
+						"is not a PlatformTransactionManager: " + tm);
+					return (PlatformTransactionManager) tm;
 				}
 			}