Improve test coverage

tests/Db/QueryBuilder/ColumnDefinitionBuilderTest.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Db\Tests\Db\QueryBuilder;
+
+use PHPUnit\Framework\TestCase;
+use Yiisoft\Db\Exception\Exception;
+use Yiisoft\Db\QueryBuilder\AbstractColumnDefinitionBuilder;
+use Yiisoft\Db\Schema\Column\ColumnBuilder;
+use Yiisoft\Db\Schema\Column\ColumnSchemaInterface;
+use Yiisoft\Db\Tests\Support\Stub\ColumnDefinitionBuilder;
+use Yiisoft\Db\Tests\Support\TestTrait;
+
+/**
+ * @group db
+ */
+final class ColumnDefinitionBuilderTest extends TestCase
+{
+    use TestTrait;
+
+    /**
+     * @throws Exception
+     */
+    public function testBuildAlter(): void
+    {
+        $db = $this->getConnection();
+        $qb = $db->getQueryBuilder();
+
+        $cdb = new ColumnDefinitionBuilder($qb);
+
+        $column = ColumnBuilder::integer();
+
+        $this->assertEquals($cdb->build($column), $cdb->buildAlter($column));
+    }
+
+    public function testBuildEmptyDefaultForUuid(): void
+    {
+        $db = $this->getConnection();
+        $qb = $db->getQueryBuilder();
+
+        $cdb = new class ($qb) extends AbstractColumnDefinitionBuilder {
+            protected function getDbType(ColumnSchemaInterface $column): string
+            {
+                return 'uuid';
+            }
+        };
+
+        $column = ColumnBuilder::uuidPrimaryKey();
+
+        $this->assertSame('uuid PRIMARY KEY', $cdb->build($column));
+    }
+}