Added tests for DropdownSingle twig component

tests/integration/Twig/Components/DropdownSingle/InputTest.php

@@ -0,0 +1,176 @@
+<?php
+
+/**
+ * @copyright Copyright (C) Ibexa AS. All rights reserved.
+ * @license For full copyright and license information view LICENSE file distributed with this source code.
+ */
+declare(strict_types=1);
+
+namespace Ibexa\Tests\Integration\DesignSystemTwig\Twig\Components\DropdownSingle;
+
+use Ibexa\DesignSystemTwig\Twig\Components\DropdownSingle\Input;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+use Symfony\Component\DomCrawler\Crawler;
+use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;
+use Symfony\Component\OptionsResolver\Exception\MissingOptionsException;
+use Symfony\UX\TwigComponent\Test\InteractsWithTwigComponents;
+
+final class InputTest extends KernelTestCase
+{
+    use InteractsWithTwigComponents;
+
+    public function testMount(): void
+    {
+        $component = $this->mountTwigComponent(Input::class, $this->baseProps(['value' => 'foo']));
+
+        self::assertInstanceOf(Input::class, $component, 'Component should mount as DropdownSingle\\Input.');
+    }
+
+    public function testEmptyStateShowsPlaceholderAndHidesSelectedItems(): void
+    {
+        $crawler = $this->renderTwigComponent(
+            Input::class,
+            $this->baseProps()
+        )->crawler();
+
+        $select = $this->getSelect($crawler);
+        $selectedOption = $select->filter('option[selected]')->first();
+        self::assertSame('a', $selectedOption->attr('value'), 'Without a value, the first option should be selected by default.');
+        self::assertSame('Alpha', trim($selectedOption->text('')), 'The first option label should be shown as selected by default.');
+
+        $placeholder = $crawler->filter('.ids-dropdown__placeholder')->first();
+        $selectedBox = $crawler->filter('.ids-dropdown__selection-info-items')->first();
+
+        self::assertNotNull($placeholder->attr('hidden'), 'Placeholder should be hidden when no explicit value is selected.');
+        self::assertNull($selectedBox->attr('hidden'), 'Selection box should be visible when no explicit value is selected.');
+        self::assertStringContainsString('Alpha', trim($selectedBox->text('')), 'Selection box should show the first item label by default.');
+    }
+
+    public function testSelectedValueHidesPlaceholderAndShowsSelectedLabel(): void
+    {
+        $crawler = $this->renderTwigComponent(Input::class, $this->baseProps(['value' => 'b']))->crawler();
+
+        $select = $this->getSelect($crawler);
+        $selectedOption = $select->filter('option[selected]')->first();
+
+        self::assertSame('b', $selectedOption->attr('value'), 'Selected <option> should match provided value.');
+        self::assertSame('Beta', trim($selectedOption->text('')), 'Selected <option> text should be the item label.');
+
+        $placeholder = $crawler->filter('.ids-dropdown__placeholder')->first();
+        $selectedBox = $crawler->filter('.ids-dropdown__selection-info-items')->first();
+
+        self::assertNotNull($placeholder->attr('hidden'), 'Placeholder should be hidden when a value is selected.');
+        self::assertNull($selectedBox->attr('hidden'), 'Selection box should be visible when a value is selected.');
+        self::assertStringContainsString('Beta', trim($selectedBox->text('')), 'Selection box should render selected label.');
+    }
+
+    public function testOptionsAreRenderedAndOneIsMarkedSelected(): void
+    {
+        $crawler = $this->renderTwigComponent(Input::class, $this->baseProps(['value' => 'a']))->crawler();
+
+        $select = $this->getSelect($crawler);
+        $options = $select->filter('option');
+
+        self::assertSame(3, $options->count(), 'Should render three <option> elements.');
+        self::assertSame('a', $select->filter('option[selected]')->attr('value'), 'The <option> with selected attribute should match provided value.');
+
+        $labels = $options->each(static fn (Crawler $o) => trim($o->text('')));
+
+        self::assertSame(['Alpha', 'Beta', 'Gamma'], $labels, 'Options should render provided labels in order.');
+    }
+
+    public function testDisabledAndErrorAddClassesAndSelectDisabled(): void
+    {
+        $crawler = $this->renderTwigComponent(
+            Input::class,
+            $this->baseProps(['disabled' => true, 'error' => true])
+        )->crawler();
+
+        $wrapper = $this->getWrapper($crawler);
+        $widget = $this->getWidget($crawler);
+        $select = $this->getSelect($crawler);
+
+        self::assertStringContainsString('ids-dropdown--disabled', $this->getClassAttr($wrapper), 'Wrapper should include disabled modifier.');
+        self::assertStringContainsString('ids-dropdown--error', $this->getClassAttr($wrapper), 'Wrapper should include error modifier.');
+        self::assertStringContainsString('ids-input--disabled', $this->getClassAttr($widget), 'Widget should include disabled modifier.');
+        self::assertStringContainsString('ids-input--error', $this->getClassAttr($widget), 'Widget should include error modifier.');
+        self::assertNotNull($select->attr('disabled'), 'Native "disabled" attribute should be present on <select> when disabled=true.');
+    }
+
+    public function testWrapperClassMergesFromAttributes(): void
+    {
+        $crawler = $this->renderTwigComponent(
+            Input::class,
+            $this->baseProps([
+                'attributes' => ['class' => 'extra-class'],
+            ])
+        )->crawler();
+
+        $wrapper = $this->getWrapper($crawler);
+
+        self::assertStringContainsString('extra-class', $this->getClassAttr($wrapper), 'Custom class should be merged into wrapper classes.');
+    }
+
+    public function testInvalidItemsTypeCausesResolverErrorOnMount(): void
+    {
+        $this->expectException(InvalidOptionsException::class);
+
+        $this->mountTwigComponent(Input::class, [
+            'name' => 'group',
+            'items' => 'not-an-array',
+        ]);
+    }
+
+    public function testMissingRequiredOptionsCauseResolverErrorOnMount(): void
+    {
+        $this->expectException(MissingOptionsException::class);
+
+        $this->mountTwigComponent(Input::class);
+    }
+
+    /**
+     * @param array<string, mixed> $overrides
+     *
+     * @return array<string, mixed>
+     */
+    private function baseProps(array $overrides = []): array
+    {
+        return array_replace([
+            'name' => 'group',
+            'items' => [
+                ['id' => 'a', 'label' => 'Alpha'],
+                ['id' => 'b', 'label' => 'Beta'],
+                ['id' => 'c', 'label' => 'Gamma'],
+            ],
+        ], $overrides);
+    }
+
+    private function getWrapper(Crawler $crawler): Crawler
+    {
+        $node = $crawler->filter('.ids-dropdown')->first();
+        self::assertGreaterThan(0, $node->count(), 'Wrapper ".ids-dropdown" should be present.');
+
+        return $node;
+    }
+
+    private function getWidget(Crawler $crawler): Crawler
+    {
+        $node = $crawler->filter('.ids-dropdown__widget')->first();
+        self::assertGreaterThan(0, $node->count(), 'Widget ".ids-dropdown__widget" should be present.');
+
+        return $node;
+    }
+
+    private function getSelect(Crawler $crawler): Crawler
+    {
+        $node = $crawler->filter('.ids-dropdown__source > select')->first();
+        self::assertGreaterThan(0, $node->count(), 'Source <select> should be present.');
+
+        return $node;
+    }
+
+    private function getClassAttr(Crawler $node): string
+    {
+        return (string) $node->attr('class');
+    }
+}