DATAJDBC-493 - Polishing.

Reformat code. Introduce assertions.

spring-data-relational/src/main/java/org/springframework/data/relational/core/sql/LockMode.java

@@ -23,6 +23,5 @@ package org.springframework.data.relational.core.sql;
  */
 public enum LockMode {
 
-	PESSIMISTIC_READ,
+	PESSIMISTIC_READ, PESSIMISTIC_WRITE
-	PESSIMISTIC_WRITE
 }

spring-data-relational/src/main/java/org/springframework/data/relational/core/sql/LockOptions.java

@@ -15,8 +15,10 @@
  */
 package org.springframework.data.relational.core.sql;
 
+import org.springframework.util.Assert;
+
 /**
- * LockOptions has a LOCK option to apply to the Select statement.
+ * Value object providing lock options to apply to a {@link Select} statement.
  *
  * @author Myeonghyeon Lee
  * @since 2.0
@@ -26,7 +28,10 @@ public class LockOptions {
 	private final LockMode lockMode;
 	private final From from;
 
-	public LockOptions(LockMode lockMode, From  from) {
+	public LockOptions(LockMode lockMode, From from) {
+
+		Assert.notNull(lockMode, "LockMode must not be null");
+		Assert.notNull(from, "From must not be null");
 
 		this.lockMode = lockMode;
 		this.from = from;

spring-data-relational/src/test/java/org/springframework/data/relational/core/dialect/SqlServerDialectUnitTests.java

@@ -15,15 +15,15 @@
  */
 package org.springframework.data.relational.core.dialect;
 
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
 import org.junit.Test;
+
 import org.springframework.data.relational.core.sql.From;
 import org.springframework.data.relational.core.sql.LockMode;
 import org.springframework.data.relational.core.sql.LockOptions;
 
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.mockito.Mockito.mock;
-
 /**
  * Unit tests for {@link SqlServerDialect}.
  *