Introduce tests for @Sql and @Transactional support in @Nested test classes

This commit was inspired by the following question on Stack Overflow.

https://stackoverflow.com/questions/53236807/spring-boot-testing-run-script-in-a-nested-test-sql-script-sql

spring-test/src/test/java/org/springframework/test/context/jdbc/PopulatedSchemaDatabaseConfig.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -20,6 +20,7 @@ import javax.sql.DataSource;
 
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
 import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
 import org.springframework.transaction.PlatformTransactionManager;
@@ -47,4 +48,9 @@ public class PopulatedSchemaDatabaseConfig {
 		.build();
 	}
 
+	@Bean
+	public JdbcTemplate jdbcTemplate(DataSource dataSource) {
+		return new JdbcTemplate(dataSource);
+	}
+
 }

spring-test/src/test/java/org/springframework/test/context/junit/jupiter/nested/NestedTestsWithSqlScriptsAndJUnitJupiterTests.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2002-2018 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.test.context.junit.jupiter.nested;
+
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.api.TestInstance.Lifecycle;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.jdbc.PopulatedSchemaDatabaseConfig;
+import org.springframework.test.context.jdbc.Sql;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+import org.springframework.test.context.transaction.AfterTransaction;
+import org.springframework.test.context.transaction.BeforeTransaction;
+import org.springframework.test.jdbc.JdbcTestUtils;
+import org.springframework.transaction.annotation.Transactional;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Integration tests that verify support for {@link Nested @Nested} test classes in
+ * conjunction with the {@link SpringExtension}, {@link Sql @Sql}, and
+ * {@link Transactional @Transactional} in a JUnit Jupiter environment.
+ *
+ * @author Sam Brannen
+ * @since 5.1.2
+ */
+@SpringJUnitConfig(PopulatedSchemaDatabaseConfig.class)
+@Transactional
+@TestInstance(Lifecycle.PER_CLASS)
+class NestedTestsWithSqlScriptsAndJUnitJupiterTests {
+
+	@Autowired
+	JdbcTemplate jdbcTemplate;
+
+	@BeforeTransaction
+	@AfterTransaction
+	void checkInitialDatabaseState() {
+		assertEquals(0, countRowsInTable("user"));
+	}
+
+	@Test
+	@Sql("/org/springframework/test/context/jdbc/data.sql")
+	void sqlScripts() {
+		assertEquals(1, countRowsInTable("user"));
+	}
+
+	private int countRowsInTable(String tableName) {
+		return JdbcTestUtils.countRowsInTable(this.jdbcTemplate, tableName);
+	}
+
+	@Nested
+	@SpringJUnitConfig(PopulatedSchemaDatabaseConfig.class)
+	@Transactional
+	class NestedTests {
+
+		@Autowired
+		JdbcTemplate jdbcTemplate;
+
+		@BeforeTransaction
+		@AfterTransaction
+		void checkInitialDatabaseState() {
+			assertEquals(0, countRowsInTable("user"));
+		}
+
+		@Test
+		@Sql("/org/springframework/test/context/jdbc/data.sql")
+		void nestedSqlScripts() {
+			assertEquals(1, countRowsInTable("user"));
+		}
+
+		private int countRowsInTable(String tableName) {
+			return JdbcTestUtils.countRowsInTable(this.jdbcTemplate, tableName);
+		}
+
+	}
+
+}