issue_503: Closed test connection after use (#504)

* test connection closed after use in BloomFilterTableTest class

* Removed unnecessary setEnv() method and h2 test database clearing

* Removed unnecessary assertion

Author: Abigael-JT

src/test/java/com/teragrep/pth10/steps/teragrep/bloomfilter/BloomFilterTableTest.java

@@ -51,6 +51,7 @@
 import org.junit.jupiter.api.*;
 
 import java.sql.Connection;
+import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.util.ArrayList;
 import java.util.List;
@@ -59,29 +60,15 @@
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class BloomFilterTableTest {
 
-    final String username = "sa";
-    final String password = "";
-    final String connectionUrl = "jdbc:h2:mem:test;MODE=MariaDB;DATABASE_TO_LOWER=TRUE;CASE_INSENSITIVE_IDENTIFIERS=TRUE";
-
-    @BeforeAll
-    void setEnv() {
-        Config config = ConfigFactory.parseProperties(getDefaultProperties());
-        Connection connection = new LazyConnection(config).get();
-        Assertions.assertDoesNotThrow(() -> {
-            connection.prepareStatement("DROP ALL OBJECTS").execute(); // h2 clear database
-        });
-        Assertions.assertDoesNotThrow(() -> {
-            Class.forName("org.h2.Driver");
-        });
-    }
+    private final String username = "sa";
+    private final String password = "";
+    private final String connectionUrl = "jdbc:h2:mem:test;MODE=MariaDB;DATABASE_TO_LOWER=TRUE;CASE_INSENSITIVE_IDENTIFIERS=TRUE";
+    private final Connection connection = Assertions
+            .assertDoesNotThrow(() -> DriverManager.getConnection(connectionUrl, username, password));
 
     @AfterAll
     void tearDown() {
-        Assertions.assertDoesNotThrow(() -> {
-            Config config = ConfigFactory.parseProperties(getDefaultProperties());
-            Connection connection = new LazyConnection(config).get();
-            connection.prepareStatement("DROP ALL OBJECTS").execute(); // h2 clear database
-        });
+        Assertions.assertDoesNotThrow(connection::close);
     }
 
     @Test
@@ -121,7 +108,7 @@ void testCreateToDatabase() {
         table.create();
         String sql = "SHOW COLUMNS FROM " + tableName + ";";
         Assertions.assertDoesNotThrow(() -> {
-            ResultSet rs = new LazyConnection(config).get().prepareStatement(sql).executeQuery();
+            ResultSet rs = connection.prepareStatement(sql).executeQuery();
             int cols = 0;
             List<String> columnList = new ArrayList<>(4);
             while (rs.next()) {