Polish RowMapper tests

spring-jdbc/src/test/java/org/springframework/jdbc/core/BeanPropertyRowMapperTests.java

@@ -16,8 +16,6 @@
 
 package org.springframework.jdbc.core;
 
-import java.util.List;
-
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.CsvSource;
@@ -64,44 +62,40 @@ class BeanPropertyRowMapperTests extends AbstractRowMapperTests {
 	@Test
 	void staticQueryWithRowMapper() throws Exception {
 		Mock mock = new Mock();
-		List<Person> result = mock.getJdbcTemplate().query(
+		Person person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birth_date, balance from people",
 				new BeanPropertyRowMapper<>(Person.class));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 		mock.verifyClosed();
 	}
 
 	@Test
 	void mappingWithInheritance() throws Exception {
 		Mock mock = new Mock();
-		List<ConcretePerson> result = mock.getJdbcTemplate().query(
+		ConcretePerson person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birth_date, balance from people",
 				new BeanPropertyRowMapper<>(ConcretePerson.class));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 		mock.verifyClosed();
 	}
 
 	@Test
 	void mappingWithNoUnpopulatedFieldsFound() throws Exception {
 		Mock mock = new Mock();
-		List<ConcretePerson> result = mock.getJdbcTemplate().query(
+		ConcretePerson person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birth_date, balance from people",
 				new BeanPropertyRowMapper<>(ConcretePerson.class, true));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 		mock.verifyClosed();
 	}
 
 	@Test
 	void mappingWithUnpopulatedFieldsNotChecked() throws Exception {
 		Mock mock = new Mock();
-		List<ExtendedPerson> result = mock.getJdbcTemplate().query(
+		ExtendedPerson person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birth_date, balance from people",
 				new BeanPropertyRowMapper<>(ExtendedPerson.class));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 		mock.verifyClosed();
 	}
 
@@ -134,44 +128,40 @@ class BeanPropertyRowMapperTests extends AbstractRowMapperTests {
 	@Test
 	void queryWithSpaceInColumnNameAndLocalDateTime() throws Exception {
 		Mock mock = new Mock(MockType.THREE);
-		List<SpacePerson> result = mock.getJdbcTemplate().query(
+		SpacePerson person = mock.getJdbcTemplate().queryForObject(
 				"select last_name as \"Last Name\", age, birth_date, balance from people",
 				new BeanPropertyRowMapper<>(SpacePerson.class));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 		mock.verifyClosed();
 	}
 
 	@Test
 	void queryWithSpaceInColumnNameAndLocalDate() throws Exception {
 		Mock mock = new Mock(MockType.THREE);
-		List<DatePerson> result = mock.getJdbcTemplate().query(
+		DatePerson person = mock.getJdbcTemplate().queryForObject(
 				"select last_name as \"Last Name\", age, birth_date, balance from people",
 				new BeanPropertyRowMapper<>(DatePerson.class));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 		mock.verifyClosed();
 	}
 
 	@Test
 	void queryWithDirectNameMatchOnBirthDate() throws Exception {
 		Mock mock = new Mock(MockType.FOUR);
-		List<ConcretePerson> result = mock.getJdbcTemplate().query(
+		ConcretePerson person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birthdate, balance from people",
 				new BeanPropertyRowMapper<>(ConcretePerson.class));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 		mock.verifyClosed();
 	}
 
 	@Test
 	void queryWithUnderscoreInColumnNameAndPersonWithMultipleAdjacentUppercaseLettersInPropertyName() throws Exception {
 		Mock mock = new Mock();
-		List<EmailPerson> result = mock.getJdbcTemplate().query(
+		EmailPerson person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birth_date, balance, e_mail from people",
 				new BeanPropertyRowMapper<>(EmailPerson.class));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 		mock.verifyClosed();
 	}
 

spring-jdbc/src/test/java/org/springframework/jdbc/core/DataClassRowMapperTests.java

@@ -17,9 +17,7 @@
 package org.springframework.jdbc.core;
 
 import java.math.BigDecimal;
-import java.util.Collections;
 import java.util.Date;
-import java.util.List;
 
 import org.junit.jupiter.api.Test;
 
@@ -30,7 +28,10 @@ import org.springframework.jdbc.core.test.ConstructorPersonWithSetters;
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
+ * Tests for {@link DataClassRowMapper}.
+ *
  * @author Juergen Hoeller
+ * @author Sam Brannen
  * @since 5.3
  */
 class DataClassRowMapperTests extends AbstractRowMapperTests {
@@ -38,11 +39,10 @@ class DataClassRowMapperTests extends AbstractRowMapperTests {
 	@Test
 	void staticQueryWithDataClass() throws Exception {
 		Mock mock = new Mock();
-		List<ConstructorPerson> result = mock.getJdbcTemplate().query(
+		ConstructorPerson person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birth_date, balance from people",
 				new DataClassRowMapper<>(ConstructorPerson.class));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 
 		mock.verifyClosed();
 	}
@@ -50,15 +50,13 @@ class DataClassRowMapperTests extends AbstractRowMapperTests {
 	@Test
 	void staticQueryWithDataClassAndGenerics() throws Exception {
 		Mock mock = new Mock();
-		List<ConstructorPersonWithGenerics> result = mock.getJdbcTemplate().query(
+		ConstructorPersonWithGenerics person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birth_date, balance from people",
 				new DataClassRowMapper<>(ConstructorPersonWithGenerics.class));
-		assertThat(result).hasSize(1);
-		ConstructorPersonWithGenerics person = result.get(0);
 		assertThat(person.name()).isEqualTo("Bubba");
 		assertThat(person.age()).isEqualTo(22L);
 		assertThat(person.birthDate()).usingComparator(Date::compareTo).isEqualTo(new Date(1221222L));
-		assertThat(person.balance()).isEqualTo(Collections.singletonList(new BigDecimal("1234.56")));
+		assertThat(person.balance()).containsExactly(new BigDecimal("1234.56"));
 
 		mock.verifyClosed();
 	}
@@ -66,11 +64,9 @@ class DataClassRowMapperTests extends AbstractRowMapperTests {
 	@Test
 	void staticQueryWithDataClassAndSetters() throws Exception {
 		Mock mock = new Mock(MockType.FOUR);
-		List<ConstructorPersonWithSetters> result = mock.getJdbcTemplate().query(
+		ConstructorPersonWithSetters person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birthdate, balance from people",
 				new DataClassRowMapper<>(ConstructorPersonWithSetters.class));
-		assertThat(result).hasSize(1);
-		ConstructorPersonWithSetters person = result.get(0);
 		assertThat(person.name()).isEqualTo("BUBBA");
 		assertThat(person.age()).isEqualTo(22L);
 		assertThat(person.birthDate()).usingComparator(Date::compareTo).isEqualTo(new Date(1221222L));
@@ -82,11 +78,10 @@ class DataClassRowMapperTests extends AbstractRowMapperTests {
 	@Test
 	void staticQueryWithDataRecord() throws Exception {
 		Mock mock = new Mock();
-		List<RecordPerson> result = mock.getJdbcTemplate().query(
+		RecordPerson person = mock.getJdbcTemplate().queryForObject(
 				"select name, age, birth_date, balance from people",
 				new DataClassRowMapper<>(RecordPerson.class));
-		assertThat(result).hasSize(1);
-		verifyPerson(result.get(0));
+		verifyPerson(person);
 
 		mock.verifyClosed();
 	}