DATAMONGO-2394 - Fix test issues related to JUnit5 upgrade.

Execution time and test order changed by using JUnit5. This commit fixes some of the issues related to index creation where actually not needed.

Original pull request: #798.

Author: christophstrobl

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateCollationTests.java

@@ -60,6 +60,11 @@ public MongoClient mongoClient() {
 		protected String getDatabaseName() {
 			return "collation-tests";
 		}
+
+		@Override
+		protected boolean autoIndexCreation() {
+			return false;
+		}
 	}
 
 	@Autowired MongoTemplate template;

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateTransactionTests.java

@@ -85,6 +85,11 @@ protected String getDatabaseName() {
 			return DB_NAME;
 		}
 
+		@Override
+		protected boolean autoIndexCreation() {
+			return false;
+		}
+
 		@Bean
 		MongoTransactionManager txManager(MongoDbFactory dbFactory) {
 			return new MongoTransactionManager(dbFactory);

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateValidationTests.java

@@ -74,6 +74,11 @@ public MongoClient mongoClient() {
 		protected String getDatabaseName() {
 			return "validation-tests";
 		}
+
+		@Override
+		protected boolean autoIndexCreation() {
+			return false;
+		}
 	}
 
 	@Autowired MongoTemplate template;

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/NoExplicitIdTests.java

@@ -59,6 +59,11 @@ protected String getDatabaseName() {
 		public MongoClient mongoClient() {
 			return MongoTestUtils.client();
 		}
+
+		@Override
+		protected boolean autoIndexCreation() {
+			return false;
+		}
 	}
 
 	@Autowired MongoOperations mongoOps;