diff --git a/tests/Phinx/Db/Adapter/PdoAdapterTest.php b/tests/Phinx/Db/Adapter/PdoAdapterTest.php
index fad2b1d07..623201b04 100644
--- a/tests/Phinx/Db/Adapter/PdoAdapterTest.php
+++ b/tests/Phinx/Db/Adapter/PdoAdapterTest.php
@@ -2,11 +2,10 @@
 
 namespace Test\Phinx\Db\Adapter;
 
+use PDO;
 use PDOException;
 use PHPUnit\Framework\TestCase;
 use RuntimeException;
-use Test\Phinx\Db\Mock\PdoAdapterTestPDOMock;
-use Test\Phinx\Db\Mock\PdoAdapterTestPDOMockWithExecChecks;
 
 class PdoAdapterTest extends TestCase
 {
@@ -34,7 +33,7 @@ public function testOptions()
 
     public function testOptionsSetConnection()
     {
-        $connection = new PdoAdapterTestPDOMock();
+        $connection = $this->getMockBuilder(PDO::class)->disableOriginalConstructor()->getMock();
         $this->adapter->setOptions(['connection' => $connection]);
 
         $this->assertSame($connection, $this->adapter->getConnection());
@@ -181,23 +180,21 @@ public function testGetVersionLongDryRun()
      */
     public function testExecuteCanBeCalled()
     {
-        $pdo = new PdoAdapterTestPDOMockWithExecChecks();
+        /** @var \PDO&\PHPUnit\Framework\MockObject\MockObject $pdo */
+        $pdo = $this->getMockBuilder(PDO::class)->disableOriginalConstructor()->onlyMethods(['exec'])->getMock();
+        $pdo->expects($this->once())->method('exec')->with('SELECT 1;')->will($this->returnValue(1));
 
         $this->adapter->setConnection($pdo);
-
         $this->adapter->execute('SELECT 1');
-
-        $this->assertSame('SELECT 1;', $pdo->getExecutedSqlForTest());
     }
 
     public function testExecuteRightTrimsSemiColons()
     {
-        $pdo = new PdoAdapterTestPDOMockWithExecChecks();
+        /** @var \PDO&\PHPUnit\Framework\MockObject\MockObject $pdo */
+        $pdo = $this->getMockBuilder(PDO::class)->disableOriginalConstructor()->onlyMethods(['exec'])->getMock();
+        $pdo->expects($this->once())->method('exec')->with('SELECT 1;')->will($this->returnValue(1));
 
         $this->adapter->setConnection($pdo);
-
         $this->adapter->execute('SELECT 1;;');
-
-        $this->assertSame('SELECT 1;', $pdo->getExecutedSqlForTest());
     }
 }
diff --git a/tests/Phinx/Db/Mock/PdoAdapterTestPDOMock.php b/tests/Phinx/Db/Mock/PdoAdapterTestPDOMock.php
deleted file mode 100644
index f2955fb87..000000000
--- a/tests/Phinx/Db/Mock/PdoAdapterTestPDOMock.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-
-namespace Test\Phinx\Db\Mock;
-
-class PdoAdapterTestPDOMock extends \PDO
-{
-    public function __construct()
-    {
-    }
-}
diff --git a/tests/Phinx/Db/Mock/PdoAdapterTestPDOMockWithExecChecks.php b/tests/Phinx/Db/Mock/PdoAdapterTestPDOMockWithExecChecks.php
deleted file mode 100644
index c35b2f595..000000000
--- a/tests/Phinx/Db/Mock/PdoAdapterTestPDOMockWithExecChecks.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-
-namespace Test\Phinx\Db\Mock;
-
-/**
- * A mock PDO that stores its last exec()'d SQL that can be retrieved for queries.
- *
- * This exists as $this->getMockForAbstractClass('\PDO') fails under PHP5.4 and
- * an older PHPUnit; a PDO instance cannot be serialised.
- */
-class PdoAdapterTestPDOMockWithExecChecks extends PdoAdapterTestPDOMock
-{
-    private $sql;
-
-    public function exec($sql)
-    {
-        $this->sql = $sql;
-
-        return 1;
-    }
-
-    public function prepare($sql, $options = [])
-    {
-        $this->sql = $sql;
-
-        return new PdoStatementMock();
-    }
-
-    public function getExecutedSqlForTest()
-    {
-        return $this->sql;
-    }
-}
diff --git a/tests/Phinx/Db/Mock/PdoStatementMock.php b/tests/Phinx/Db/Mock/PdoStatementMock.php
deleted file mode 100644
index e6051a7b3..000000000
--- a/tests/Phinx/Db/Mock/PdoStatementMock.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-namespace Test\Phinx\Db\Mock;
-
-class PdoStatementMock
-{
-    public function execute()
-    {
-        return true;
-    }
-
-    public function rowCount()
-    {
-        return 1;
-    }
-}