Polish JmsAccessorTests

This commit reduces the visibility of JmsAccessorTests and its test
methods to package-private and removes unnecessary throws declarations.

Author: vpavic

spring-jms/src/test/java/org/springframework/jms/support/JmsAccessorTests.java

@@ -31,33 +31,33 @@
  * @author Chris Beams
  * @author Vedran Pavic
  */
-public class JmsAccessorTests {
+class JmsAccessorTests {
 
 	@Test
-	public void testChokesIfConnectionFactoryIsNotSupplied() throws Exception {
+	void testChokesIfConnectionFactoryIsNotSupplied() {
 		JmsAccessor accessor = new StubJmsAccessor();
 		assertThatIllegalArgumentException().isThrownBy(
 				accessor::afterPropertiesSet);
 	}
 
 	@Test
-	public void testSessionTransactedModeReallyDoesDefaultToFalse() throws Exception {
+	void testSessionTransactedModeReallyDoesDefaultToFalse() {
 		JmsAccessor accessor = new StubJmsAccessor();
 		assertThat(accessor.isSessionTransacted()).as("The [sessionTransacted] property of JmsAccessor must default to " +
 				"false. Change this test (and the attendant Javadoc) if you have " +
 				"changed the default.").isFalse();
 	}
 
 	@Test
-	public void testAcknowledgeModeReallyDoesDefaultToAutoAcknowledge() throws Exception {
+	void testAcknowledgeModeReallyDoesDefaultToAutoAcknowledge() {
 		JmsAccessor accessor = new StubJmsAccessor();
 		assertThat(accessor.getSessionAcknowledgeMode()).as("The [sessionAcknowledgeMode] property of JmsAccessor must default to " +
 				"[Session.AUTO_ACKNOWLEDGE]. Change this test (and the attendant " +
 				"Javadoc) if you have changed the default.").isEqualTo(Session.AUTO_ACKNOWLEDGE);
 	}
 
 	@Test
-	public void testSetAcknowledgeModeNameChokesIfBadAckModeIsSupplied() throws Exception {
+	void testSetAcknowledgeModeNameChokesIfBadAckModeIsSupplied() {
 		assertThatIllegalArgumentException().isThrownBy(() ->
 				new StubJmsAccessor().setSessionAcknowledgeModeName("Tally ho chaps!"));
 	}