Use JUnit 5 convention for class visibility

Author: garydgregory

src/test/java/org/apache/commons/dbcp2/Jdbc41BridgeTest.java

@@ -37,7 +37,7 @@
 /**
  * Tests {@link Jdbc41Bridge}.
  */
-public class Jdbc41BridgeTest {
+class Jdbc41BridgeTest {
 
     private Connection getConnection() throws SQLException {
         return DriverManager.getConnection("jdbc:h2:mem:test");

src/test/java/org/apache/commons/dbcp2/datasources/CharArrayTest.java

@@ -27,7 +27,7 @@
 /**
  * Tests {@link CharArray}.
  */
-public class CharArrayTest {
+class CharArrayTest {
 
     @Test
     void testAsString() {

src/test/java/org/apache/commons/dbcp2/datasources/PooledConnectionManagerTest.java

@@ -28,7 +28,7 @@
 /*
  * Tests {@link PooledConnectionManager}.
  */
-public class PooledConnectionManagerTest {
+class PooledConnectionManagerTest {
 
     static class Fixture implements PooledConnectionManager {
 

src/test/java/org/apache/commons/dbcp2/datasources/UserPassKeyTest.java

@@ -26,7 +26,7 @@
 /**
  * Tests {@link UserPassKey}
  */
-public class UserPassKeyTest {
+class UserPassKeyTest {
 
     @Test
     void testClear() {