diff --git a/tests/DeleteTest.php b/tests/DeleteTest.php
index 51774ab..d0d37d0 100644
--- a/tests/DeleteTest.php
+++ b/tests/DeleteTest.php
@@ -5,22 +5,8 @@
 use ipl\Sql\Delete;
 use ipl\Sql\QueryBuilder;
 
-class DeleteTest extends \PHPUnit\Framework\TestCase
+class DeleteTest extends TestCase
 {
-    /**
-     * The DELETE query to test
-     *
-     * @var Delete
-     */
-    protected $query;
-
-    /**
-     * The SQL query builder
-     *
-     * @var QueryBuilder
-     */
-    protected $queryBuilder;
-
     public function setupTestTest()
     {
         $this->query = new Delete();
@@ -53,12 +39,4 @@ public function testFromWithArray()
         $this->assertSame(['t1' => 'table'], $this->query->getFrom());
         $this->assertCorrectStatementAndValues('DELETE FROM table t1', []);
     }
-
-    protected function assertCorrectStatementAndValues($statement, $values)
-    {
-        list($actualStatement, $actualValues) = $this->queryBuilder->assembleDelete($this->query);
-
-        $this->assertSame($statement, $actualStatement);
-        $this->assertSame($values, $actualValues);
-    }
 }
diff --git a/tests/HavingTest.php b/tests/HavingTest.php
index c035d05..84d65b9 100644
--- a/tests/HavingTest.php
+++ b/tests/HavingTest.php
@@ -3,32 +3,10 @@
 namespace ipl\Tests\Sql;
 
 use ipl\Sql\Expression;
-use ipl\Sql\QueryBuilder;
 use ipl\Sql\Select;
-use ipl\Sql\Sql;
 
-class HavingTest extends \PHPUnit\Framework\TestCase
+class HavingTest extends TestCase
 {
-    /**
-     * The SELECT query to test
-     *
-     * @var Select
-     */
-    protected $query;
-
-    /**
-     * The SQL query builder
-     *
-     * @var QueryBuilder
-     */
-    protected $queryBuilder;
-
-    public function setupTest()
-    {
-        $this->query = new Select();
-        $this->queryBuilder = new QueryBuilder(new TestAdapter());
-    }
-
     public function testHavingStringFormat()
     {
         $this->setupTest();
@@ -95,12 +73,4 @@ public function testResetHaving()
             $this->query->getHaving()
         );
     }
-
-    protected function assertCorrectStatementAndValues($statement, $values)
-    {
-        list($actualStatement, $actualValues) = $this->queryBuilder->assembleSelect($this->query);
-
-        $this->assertSame($statement, $actualStatement);
-        $this->assertSame($values, $actualValues);
-    }
 }
diff --git a/tests/InsertTest.php b/tests/InsertTest.php
index dd1a200..1f3959d 100644
--- a/tests/InsertTest.php
+++ b/tests/InsertTest.php
@@ -4,30 +4,14 @@
 
 use ipl\Sql\Expression;
 use ipl\Sql\Insert;
-use ipl\Sql\QueryBuilder;
 use ipl\Sql\Select;
 
-class InsertTest extends \PHPUnit\Framework\TestCase
+class InsertTest extends TestCase
 {
-    /**
-     * The INSERT query to test
-     *
-     * @var Insert
-     */
-    protected $query;
-
-    /**
-     * The SQL query builder
-     *
-     * @var QueryBuilder
-     */
-    protected $queryBuilder;
+    protected $queryClass = Insert::class;
 
-    public function setupTest()
-    {
-        $this->query = new Insert();
-        $this->queryBuilder = new QueryBuilder(new TestAdapter());
-    }
+    /** @var Insert */
+    protected $query;
 
     public function testEmptyInsertInto()
     {
@@ -157,12 +141,4 @@ public function testInsertIntoStatementWithColumnsAndValues()
 
         $this->assertCorrectStatementAndValues('INSERT INTO table (c1,c2) VALUES(?,?)', ['v1', 'v2']);
     }
-
-    protected function assertCorrectStatementAndValues($statement, $values)
-    {
-        list($actualStatement, $actualValues) = $this->queryBuilder->assembleInsert($this->query);
-
-        $this->assertSame($statement, $actualStatement);
-        $this->assertSame($values, $actualValues);
-    }
 }
diff --git a/tests/Mssql/SelectTest.php b/tests/Mssql/SelectTest.php
index 2f055f4..65652de 100644
--- a/tests/Mssql/SelectTest.php
+++ b/tests/Mssql/SelectTest.php
@@ -3,30 +3,11 @@
 namespace ipl\Tests\Sql\Mssql;
 
 use ipl\Sql\Adapter\Mssql;
-use ipl\Sql\QueryBuilder;
-use ipl\Sql\Select;
+use ipl\Tests\Sql\TestCase;
 
-class SelectTest extends \PHPUnit\Framework\TestCase
+class SelectTest extends TestCase
 {
-    /**
-     * The SELECT query to test
-     *
-     * @var Select
-     */
-    protected $query;
-
-    /**
-     * The SQL query builder
-     *
-     * @var QueryBuilder
-     */
-    protected $queryBuilder;
-
-    public function setupTest()
-    {
-        $this->query = new Select();
-        $this->queryBuilder = new QueryBuilder(new Mssql());
-    }
+    protected $adapterClass = Mssql::class;
 
     public function testLimitOffset()
     {
@@ -63,12 +44,4 @@ public function testAutomaticallyFixesLimitWithoutOrder()
 
         $this->assertCorrectStatementAndValues('SELECT a FROM b ORDER BY 1 OFFSET 30 ROWS FETCH NEXT 10 ROWS ONLY');
     }
-
-    protected function assertCorrectStatementAndValues($statement, array $values = [])
-    {
-        list($actualStatement, $actualValues) = $this->queryBuilder->assembleSelect($this->query);
-
-        $this->assertSame($statement, $actualStatement);
-        $this->assertSame($values, $actualValues);
-    }
 }
diff --git a/tests/SelectTest.php b/tests/SelectTest.php
index 16155cc..03b1246 100644
--- a/tests/SelectTest.php
+++ b/tests/SelectTest.php
@@ -3,33 +3,12 @@
 namespace ipl\Tests\Sql;
 
 use ipl\Sql\Expression;
-use ipl\Sql\QueryBuilder;
 use ipl\Sql\Select;
 use ipl\Sql\Sql;
 use UnexpectedValueException;
 
-class SelectTest extends \PHPUnit\Framework\TestCase
+class SelectTest extends TestCase
 {
-    /**
-     * The SELECT query to test
-     *
-     * @var Select
-     */
-    protected $query;
-
-    /**
-     * The SQL query builder
-     *
-     * @var QueryBuilder
-     */
-    protected $queryBuilder;
-
-    public function setupTest()
-    {
-        $this->query = new Select();
-        $this->queryBuilder = new QueryBuilder(new TestAdapter());
-    }
-
     public function testDistinct()
     {
         $this->setupTest();
@@ -821,12 +800,4 @@ public function testInvalidOderByDirectionsThrowAnError()
 
         $this->queryBuilder->assembleSelect($this->query);
     }
-
-    protected function assertCorrectStatementAndValues($statement, $values)
-    {
-        list($actualStatement, $actualValues) = $this->queryBuilder->assembleSelect($this->query);
-
-        $this->assertSame($statement, $actualStatement);
-        $this->assertSame($values, $actualValues);
-    }
 }
diff --git a/tests/UpdateTest.php b/tests/UpdateTest.php
index 203bfa8..bb7a1b6 100644
--- a/tests/UpdateTest.php
+++ b/tests/UpdateTest.php
@@ -3,31 +3,15 @@
 namespace ipl\Tests\Sql;
 
 use ipl\Sql\Expression;
-use ipl\Sql\QueryBuilder;
 use ipl\Sql\Select;
 use ipl\Sql\Update;
 
-class UpdateTest extends \PHPUnit\Framework\TestCase
+class UpdateTest extends TestCase
 {
-    /**
-     * The UPDATE query to test
-     *
-     * @var Update
-     */
-    protected $query;
-
-    /**
-     * The SQL query builder
-     *
-     * @var QueryBuilder
-     */
-    protected $queryBuilder;
+    protected $queryClass = Update::class;
 
-    public function setupTest()
-    {
-        $this->query = new Update();
-        $this->queryBuilder = new QueryBuilder(new TestAdapter());
-    }
+    /** @var Update */
+    protected $query;
 
     public function testEmptyUpdateTable()
     {
@@ -100,12 +84,4 @@ public function testUpdateStatementWithSet()
 
         $this->assertCorrectStatementAndValues('UPDATE table SET c1 = ?, c2 = ?', ['v1', 'v2']);
     }
-
-    protected function assertCorrectStatementAndValues($statement, $values)
-    {
-        list($actualStatement, $actualValues) = $this->queryBuilder->assembleUpdate($this->query);
-
-        $this->assertSame($statement, $actualStatement);
-        $this->assertSame($values, $actualValues);
-    }
 }
diff --git a/tests/WhereTest.php b/tests/WhereTest.php
index 67a9950..00ae5c6 100644
--- a/tests/WhereTest.php
+++ b/tests/WhereTest.php
@@ -3,32 +3,11 @@
 namespace ipl\Tests\Sql;
 
 use ipl\Sql\Expression;
-use ipl\Sql\QueryBuilder;
 use ipl\Sql\Select;
 use ipl\Sql\Sql;
 
-class WhereTest extends \PHPUnit\Framework\TestCase
+class WhereTest extends TestCase
 {
-    /**
-     * The SELECT query to test
-     *
-     * @var Select
-     */
-    protected $query;
-
-    /**
-     * The SQL query builder
-     *
-     * @var QueryBuilder
-     */
-    protected $queryBuilder;
-
-    public function setupTest()
-    {
-        $this->query = new Select();
-        $this->queryBuilder = new QueryBuilder(new TestAdapter());
-    }
-
     public function testWhereStringFormat()
     {
         $this->setupTest();
@@ -287,12 +266,4 @@ public function testResetWhere()
             $this->query->getWhere()
         );
     }
-
-    protected function assertCorrectStatementAndValues($statement, $values)
-    {
-        list($actualStatement, $actualValues) = $this->queryBuilder->assembleSelect($this->query);
-
-        $this->assertSame($statement, $actualStatement);
-        $this->assertSame($values, $actualValues);
-    }
 }