Merge pull request #28472 from JiayiLi1999

* pr/28472:
  Polish "Improve test coverage of RdbmsOperation"
  Improve test coverage of RdbmsOperation

Closes gh-28472

Author: snicoll

spring-jdbc/src/test/java/org/springframework/jdbc/object/RdbmsOperationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -78,29 +78,39 @@ public void tooFewParameters() {
 
 	@Test
 	public void tooFewMapParameters() {
+		operation.setDataSource(new DriverManagerDataSource());
 		operation.setSql("select * from mytable");
 		operation.setTypes(new int[] { Types.INTEGER });
 		assertThatExceptionOfType(InvalidDataAccessApiUsageException.class).isThrownBy(() ->
 				operation.validateNamedParameters((Map<String, String>) null));
 	}
 
 	@Test
-	public void operationConfiguredViaJdbcTemplateMustGetDataSource() throws Exception {
+	public void operationConfiguredViaJdbcTemplateMustGetDataSource() {
 		operation.setSql("foo");
 		assertThatExceptionOfType(InvalidDataAccessApiUsageException.class).isThrownBy(() ->
 				operation.compile())
-			.withMessageContaining("ataSource");
+			.withMessageContaining("'dataSource'");
 	}
 
 	@Test
 	public void tooManyParameters() {
+		operation.setDataSource(new DriverManagerDataSource());
 		operation.setSql("select * from mytable");
 		assertThatExceptionOfType(InvalidDataAccessApiUsageException.class).isThrownBy(() ->
 				operation.validateParameters(new Object[] { 1, 2 }));
 	}
+	@Test
+	public void tooManyMapParameters() {
+		operation.setDataSource(new DriverManagerDataSource());
+		operation.setSql("select * from mytable");
+		assertThatExceptionOfType(InvalidDataAccessApiUsageException.class).isThrownBy(() ->
+				operation.validateNamedParameters(Map.of("a", "b", "c", "d")));
+	}
 
 	@Test
 	public void unspecifiedMapParameters() {
+		operation.setDataSource(new DriverManagerDataSource());
 		operation.setSql("select * from mytable");
 		Map<String, String> params = new HashMap<>();
 		params.put("col1", "value");