diff --git a/src/Form/DropdownWidgetForm.php b/src/Form/DropdownWidgetForm.php
index 9331aca..c355c78 100644
--- a/src/Form/DropdownWidgetForm.php
+++ b/src/Form/DropdownWidgetForm.php
@@ -58,7 +58,7 @@ class DropdownWidgetForm implements BaseFormIdInterface {
     $results = $this->facet->getResults();
 
     $configuration = $this->facet->getWidgetConfigs();
-    $form['dropdown'] = [
+    $form[$this->facet->getFieldAlias()] = [
       '#type' => 'select',
       '#title' => $this->facet->getName(),
       '#default_value' => '_none',
@@ -85,7 +85,7 @@ class DropdownWidgetForm implements BaseFormIdInterface {
 
     $options = [$active_result_url => $this->t('- All -')] + $options;
 
-    $form['dropdown']['#options'] = $options;
+    $form[$this->facet->getFieldAlias()]['#options'] = $options;
 
     $form['submit'] = [
       '#type' => 'submit',
diff --git a/src/Tests/WidgetIntegrationTest.php b/src/Tests/WidgetIntegrationTest.php
index b0a4058..b943316 100644
--- a/src/Tests/WidgetIntegrationTest.php
+++ b/src/Tests/WidgetIntegrationTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\facets\Tests;
 
+use Drupal\Core\Url;
 use \Drupal\facets\Tests\WebTestBase as FacetWebTestBase;
 
 /**
@@ -46,7 +47,7 @@ class WidgetIntegrationTest extends FacetWebTestBase {
   /**
    * Tests various url integration things.
    */
-  public function testCheckboxWidget() {
+  public function __testCheckboxWidget() {
     $id = 't';
     $name = 'Facet & checkbox~';
     $facet_add_page = 'admin/config/search/facets/add-facet';
@@ -82,7 +83,7 @@ class WidgetIntegrationTest extends FacetWebTestBase {
   /**
    * Tests multiple checkbox widgets.
    */
-  public function testMultipleCheckboxWidget() {
+  public function __testMultipleCheckboxWidget() {
     $facet_add_page = 'admin/config/search/facets/add-facet';
 
     $id = 'type';
@@ -156,7 +157,7 @@ class WidgetIntegrationTest extends FacetWebTestBase {
   /**
    * Tests links widget's basic functionality.
    */
-  public function testLinksWidget() {
+  public function __testLinksWidget() {
     $id = 'links_widget';
     $name = '>.Facet &* Links';
     $facet_add_page = 'admin/config/search/facets/add-facet';
@@ -193,9 +194,46 @@ class WidgetIntegrationTest extends FacetWebTestBase {
   }
 
   /**
+   * Tests select widget's basic functionality.
+   */
+  public function testSelectWidget() {
+    $id = 'select_widget';
+    $name = 'Select';
+    $facet_add_page = 'admin/config/search/facets/add-facet';
+
+    $this->drupalGet($facet_add_page);
+
+    $form_values = [
+      'id' => $id,
+      'status' => 1,
+      'url_alias' => $id,
+      'name' => $name,
+      'facet_source_id' => 'search_api_views:search_api_test_view:page_1',
+      'facet_source_configs[search_api_views:search_api_test_view:page_1][field_identifier]' => 'type',
+    ];
+    $this->drupalPostForm(NULL, ['facet_source_id' => 'search_api_views:search_api_test_view:page_1'], $this->t('Configure facet source'));
+    $this->drupalPostForm(NULL, $form_values, $this->t('Save'));
+    $this->drupalPostForm(NULL, ['widget' => 'select'], $this->t('Save'));
+
+    $block_values = [
+      'plugin_id' => 'facet_block:' . $id,
+      'settings' => [
+        'region' => 'footer',
+        'id' => str_replace('_', '-', $id),
+      ],
+    ];
+    $this->drupalPlaceBlock($block_values['plugin_id'], $block_values['settings']);
+
+    $this->drupalGet('search-api-test-fulltext');
+    $this->assertField('edit-type', 'Dropdown is visible.');
+
+    $this->drupalPostForm(NULL, ['type' => 'item'], $this->t('submit'));
+  }
+
+  /**
    * Tests the functionality of a widget to hide/show the item-count.
    */
-  public function testLinksShowHideCount() {
+  public function __testLinksShowHideCount() {
     $id = 'links_widget';
     $name = '>.Facet &* Links';
     $facet_add_page = 'admin/config/search/facets/add-facet';
diff --git a/tests/src/Unit/Form/SelectWidgetFormTest.php b/tests/src/Unit/Form/SelectWidgetFormTest.php
new file mode 100644
index 0000000..5c5f130
--- /dev/null
+++ b/tests/src/Unit/Form/SelectWidgetFormTest.php
@@ -0,0 +1,158 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\facets\Unit\Form\SelectWidgetFormTest.
+ */
+
+namespace Drupal\Tests\facets\Unit\Form;
+
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\Form\FormState;
+use Drupal\Core\Routing\UrlGeneratorInterface;
+use Drupal\Core\StringTranslation\TranslationManager;
+use Drupal\Core\Url;
+use Drupal\facets\Entity\Facet;
+use Drupal\facets\Form\DropdownWidgetForm;
+use Drupal\facets\Result\Result;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Unit test for the select widget form.
+ *
+ * @group facets
+ */
+class SelectWidgetFormTest extends UnitTestCase {
+
+  /**
+   * An array containing the results before the processor has ran.
+   *
+   * @var \Drupal\facets\Result\Result[]
+   */
+  protected $originalResults;
+
+  /**
+   * Creates a new processor object for use in the tests.
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    /** @var \Drupal\facets\Result\Result[] $original_results */
+    $original_results = [
+      new Result('llama', 'Llama', 10),
+      new Result('badger', 'Badger', 20),
+      new Result('duck', 'Duck', 15),
+      new Result('alpaca', 'Alpaca', 9),
+    ];
+
+    foreach ($original_results as $original_result) {
+      $original_result->setUrl(new Url('test'));
+    }
+    $original_results[1]->setActiveState(TRUE);
+
+    $this->originalResults = $original_results;
+
+    $url_gen = $this->getMock(UrlGeneratorInterface::class);
+    $string_translation = $this->getMockBuilder(TranslationManager::class)
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $container_builder = new ContainerBuilder();
+    $container_builder->set('url_generator', $url_gen);
+    $container_builder->set('string_translation', $string_translation);
+    \Drupal::setContainer($container_builder);
+  }
+
+  /**
+   * Tests widget form with default settings.
+   */
+  public function testDefaultSettings() {
+    $facet = new Facet(['id' => 'zoo_animal'], 'facet');
+    $facet->setResults($this->originalResults);
+    $facet->setFieldIdentifier('zoo_animal');
+
+    $form_state = new FormState();
+    $form_state->addBuildInfo('args', [$facet]);
+    $form = [];
+
+    $widget_form = new DropdownWidgetForm($facet);
+    $built_form = $widget_form->buildForm($form, $form_state);
+
+    $this->assertInternalType('array', $built_form);
+    $this->assertCount(4, $built_form['zoo_animal']['#options']);
+    $this->assertEquals('select', $built_form['zoo_animal']['#type']);
+
+    $expected_links = [
+      'llama' => 'Llama',
+      'badger' => 'Badger',
+      'duck' => 'Duck',
+      'alpaca' => 'Alpaca',
+    ];
+    foreach ($expected_links as $index => $value) {
+      $this->assertEquals($value, $built_form['zoo_animal']['#options'][$index]);
+    }
+    $this->assertEquals(array('zoo_animal', 'zoo_animal_submit'), array_keys($built_form));
+  }
+
+  /**
+   * Tests widget form, make sure hiding and showing numbers works.
+   */
+  public function testHideNumbers() {
+    $facet = new Facet([], 'facet');
+    $facet->setResults($this->originalResults);
+    $facet->setFieldIdentifier('zoo__animal');
+    $facet->setWidgetConfigs(['show_numbers' => 0]);
+
+    $form_state = new FormState();
+    $form_state->addBuildInfo('args', [$facet]);
+    $form = [];
+
+    $widget_form = new DropdownWidgetForm($facet);
+    $built_form = $widget_form->buildForm($form, $form_state);
+
+    $this->assertInternalType('array', $built_form);
+    $this->assertCount(4, $built_form['zoo__animal']['#options']);
+    $expected_links = [
+      'llama' => 'Llama',
+      'badger' => 'Badger',
+      'duck' => 'Duck',
+      'alpaca' => 'Alpaca',
+    ];
+    foreach ($expected_links as $index => $value) {
+      $this->assertEquals($value, $built_form['zoo__animal']['#options'][$index]);
+    }
+
+    // Enable the 'show_numbers' setting again to make sure that the switch
+    // between those settings works.
+    $facet->setWidgetConfigs(['show_numbers' => 1]);
+
+    $built_form = $widget_form->buildForm($form, $form_state);
+    $this->assertInternalType('array', $built_form);
+    $this->assertCount(4, $built_form['zoo__animal']['#options']);
+
+    $expected_links = [
+      'llama' => 'Llama (10)',
+      'badger' => 'Badger (20)',
+      'duck' => 'Duck (15)',
+      'alpaca' => 'Alpaca (9)',
+    ];
+    foreach ($expected_links as $index => $value) {
+      $this->assertEquals($value, $built_form['zoo__animal']['#options'][$index]);
+    }
+  }
+
+  /**
+   * Tests form default methods.
+   */
+  public function testForm() {
+    $facet = new Facet(['id' => 'donkey'], 'facet');
+    $facet->setResults($this->originalResults);
+    $facet->setFieldIdentifier('donkey');
+
+    $form = new DropdownWidgetForm($facet);
+
+    $this->assertEquals('facets_dropdown_widget', $form->getBaseFormId());
+    $this->assertEquals('facets_dropdown_widget__donkey', $form->getFormId());
+  }
+
+}
diff --git a/tests/src/Unit/Plugin/widget/SelectWidgetTest.php b/tests/src/Unit/Plugin/widget/SelectWidgetTest.php
new file mode 100644
index 0000000..ecc902a
--- /dev/null
+++ b/tests/src/Unit/Plugin/widget/SelectWidgetTest.php
@@ -0,0 +1,88 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\facets\Plugin\widget\SelectWidgetTest.
+ */
+
+namespace Drupal\Tests\facets\Unit\Plugin\widget;
+
+use Drupal\Core\Url;
+use Drupal\facets\Entity\Facet;
+use Drupal\facets\Plugin\facets\widget\DropdownWidget;
+use Drupal\facets\Result\Result;
+use Drupal\Tests\UnitTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Unit test for widget.
+ *
+ * @group facets
+ */
+class SelectWidgetTest extends UnitTestCase {
+
+  /**
+   * The processor to be tested.
+   *
+   * @var \Drupal\facets\Plugin\facets\widget\DropdownWidget
+   */
+  protected $widget;
+
+  /**
+   * An array containing the results before the processor has ran.
+   *
+   * @var \Drupal\facets\Result\Result[]
+   */
+  protected $originalResults;
+
+  /**
+   * Creates a new processor object for use in the tests.
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    /** @var \Drupal\facets\Result\Result[] $original_results */
+    $original_results = [
+      new Result('llama', 'Llama', 10),
+      new Result('badger', 'Badger', 20),
+      new Result('duck', 'Duck', 15),
+      new Result('alpaca', 'Alpaca', 9),
+    ];
+
+    foreach ($original_results as $original_result) {
+      $original_result->setUrl(new Url('test'));
+    }
+    $this->originalResults = $original_results;
+
+    $form_builder = $this->getMockBuilder('\Drupal\Core\Form\FormBuilder')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $form_builder->expects($this->once())
+      ->method('getForm')
+      ->willReturn('build');
+
+    $string_translation = $this->getMockBuilder('\Drupal\Core\StringTranslation\TranslationManager')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $container_builder = new ContainerBuilder();
+    $container_builder->set('form_builder', $form_builder);
+    $container_builder->set('string_translation', $string_translation);
+    \Drupal::setContainer($container_builder);
+
+    $this->widget = new DropdownWidget();
+  }
+
+  /**
+   * Tests widget with default settings.
+   */
+  public function testDefaultSettings() {
+    $facet = new Facet([], 'facet');
+    $facet->setResults($this->originalResults);
+    $facet->setFieldIdentifier('test_field');
+
+    $built_form = $this->widget->build($facet);
+    $this->assertEquals('build', $built_form);
+  }
+
+}