Merge pull request #23762 from izeye

* pr/23762:
  Polish assertions
  Polish

Closes gh-23762

Author: snicoll

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/DataSourcePropertiesTests.java

@@ -103,7 +103,7 @@ void determineUsernameWhenEmpty() throws Exception {
 		DataSourceProperties properties = new DataSourceProperties();
 		properties.setUsername("");
 		properties.afterPropertiesSet();
-		assertThat(properties.getUsername());
+		assertThat(properties.getUsername()).isEqualTo("");
 		assertThat(properties.determineUsername()).isEqualTo("sa");
 	}
 
@@ -112,7 +112,7 @@ void determineUsernameWhenNull() throws Exception {
 		DataSourceProperties properties = new DataSourceProperties();
 		properties.setUsername(null);
 		properties.afterPropertiesSet();
-		assertThat(properties.getUsername());
+		assertThat(properties.getUsername()).isNull();
 		assertThat(properties.determineUsername()).isEqualTo("sa");
 	}
 

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jdbc/EmbeddedDatabaseConnection.java

@@ -140,7 +140,7 @@ boolean isDriverCompatible(String driverClass) {
 	 * database type.
 	 * @param driverClass the driver class
 	 * @return true if the driver class is one of the embedded types
-	 * @deprecated since 2.3.5 in favor of {@link #isEmbedded(String, String)}
+	 * @deprecated since 2.4.0 in favor of {@link #isEmbedded(String, String)}
 	 */
 	@Deprecated
 	public static boolean isEmbedded(String driverClass) {
@@ -151,8 +151,9 @@ public static boolean isEmbedded(String driverClass) {
 	 * Convenience method to determine if a given driver class name and url represent an
 	 * embedded database type.
 	 * @param driverClass the driver class
-	 * @param url the jdbc url (can be {@code null)}
+	 * @param url the jdbc url (can be {@code null})
 	 * @return true if the driver class and url refer to an embedded database
+	 * @since 2.4.0
 	 */
 	public static boolean isEmbedded(String driverClass, String url) {
 		if (driverClass == null) {