Issue #2969107 by raman.b, matiasmiranda, kkalashnikov, L-four, daffie,...

   */

  public function summaryName($data) {

    $month = str_pad($data->{$this->name_alias}, 2, '0', STR_PAD_LEFT);

    try {

      return $this->dateFormatter->format(strtotime("2005" . $month . "15" . " 00:00:00 UTC"), 'custom', $this->format, 'UTC');

    }

    catch (\InvalidArgumentException $e) {

      return parent::summaryName($data);

    }

  }

  /**

   * {@inheritdoc}

   */

  public function title() {

    $month = str_pad($this->argument, 2, '0', STR_PAD_LEFT);

    try {

      return $this->dateFormatter->format(strtotime("2005" . $month . "15" . " 00:00:00 UTC"), 'custom', $this->format, 'UTC');

    }

    catch (\InvalidArgumentException $e) {

      return parent::title();

    }

  }

  public function summaryArgument($data) {

    // Make sure the argument contains leading zeroes.

langcode: en

status: true

dependencies:

  module:

    - node

id: test_month_date_plugin

label: 'Test Month Date Plugin'

module: views

description: ''

tag: ''

base_table: node_field_data

base_field: nid

display:

  default:

    display_plugin: default

    id: default

    display_title: Master

    position: 0

    display_options:

      access:

        type: none

        options: {  }

      cache:

        type: tag

        options: {  }

      query:

        type: views_query

        options:

          disable_sql_rewrite: false

          distinct: false

          replica: false

          query_comment: ''

          query_tags: {  }

      exposed_form:

        type: basic

        options:

          submit_button: Apply

          reset_button: false

          reset_button_label: Reset

          exposed_sorts_label: 'Sort by'

          expose_sort_order: true

          sort_asc_label: Asc

          sort_desc_label: Desc

      pager:

        type: none

        options:

          offset: 0

      style:

        type: default

        options:

          grouping: {  }

          row_class: ''

          default_row_class: true

          uses_fields: false

      row:

        type: fields

        options:

          inline: {  }

          separator: ''

          hide_empty: false

          default_field_elements: true

      fields:

        title:

          id: title

          table: node_field_data

          field: title

          entity_type: node

          entity_field: title

          label: ''

          alter:

            alter_text: false

            make_link: false

            absolute: false

            trim: false

            word_boundary: false

            ellipsis: false

            strip_tags: false

            html: false

          hide_empty: false

          empty_zero: false

          settings:

            link_to_entity: true

          plugin_id: field

          relationship: none

          group_type: group

          admin_label: ''

          exclude: false

          element_type: ''

          element_class: ''

          element_label_type: ''

          element_label_class: ''

          element_label_colon: true

          element_wrapper_type: ''

          element_wrapper_class: ''

          element_default_classes: true

          empty: ''

          hide_alter_empty: true

          click_sort_column: value

          type: string

          group_column: value

          group_columns: {  }

          group_rows: true

          delta_limit: 0

          delta_offset: 0

          delta_reversed: false

          delta_first_last: false

          multi_type: separator

          separator: ', '

          field_api_classes: false

      filters: {  }

      sorts: {  }

      header: {  }

      footer: {  }

      empty: {  }

      relationships: {  }

      arguments:

        created_month:

          id: created_month

          table: node_field_data

          field: created_month

          relationship: none

          group_type: group

          admin_label: ''

          default_action: default

          exception:

            value: all

            title_enable: false

            title: All

          title_enable: false

          title: ''

          default_argument_type: query_parameter

          default_argument_options:

            query_param: month

            fallback: all

            multiple: or

          default_argument_skip_url: false

          summary_options:

            base_path: ''

            count: true

            items_per_page: 25

            override: false

          summary:

            sort_order: asc

            number_of_records: 0

            format: default_summary

          specify_validation: false

          validate:

            type: none

            fail: 'not found'

          validate_options: {  }

          entity_type: node

          plugin_id: date_month

      display_extenders: {  }

    cache_metadata:

      max-age: -1

      contexts:

        - url

        - 'user.node_grants:view'

      tags: {  }

  page_1:

    display_plugin: page

    id: page_1

    display_title: Page

    position: 1

    display_options:

      display_extenders: {  }

      path: test-month-date-plugin

    cache_metadata:

      max-age: -1

      contexts:

        - url

        - 'user.node_grants:view'

      tags: {  }

<?php

namespace Drupal\Tests\views\Functional\Plugin;

use Drupal\Core\Url;

use Drupal\Tests\views\Functional\ViewTestBase;

/**

 * Tests the Month Date Plugin.

 *

 * @group views

 */

class MonthDatePluginTest extends ViewTestBase {

  /**

   * Views used by this test.

   *

   * @var array

   */

  public static $testViews = ['test_month_date_plugin'];

  /**

   * Modules to enable.

   *

   * @var array

   */

  protected static $modules = ['node'];

  /**

   * {@inheritdoc}

   */

  protected $defaultTheme = 'stark';

  /**

   * Test node 1.

   *

   * @var \Drupal\node\NodeInterface

   */

  protected $node1;

  /**

   * Test node 2.

   *

   * @var \Drupal\node\NodeInterface

   */

  protected $node2;

  /**

   * {@inheritdoc}

   */

  public function setUp($import_test_views = TRUE): void {

    parent::setUp($import_test_views);

    $date1 = '2020-10-01 00:00:00';

    $this->node1 = $this->drupalCreateNode(['created' => strtotime($date1)]);

    $date2 = '2020-11-01 00:00:00';

    $this->node2 = $this->drupalCreateNode(['created' => strtotime($date2)]);

  }

  /**

   * Tests the Month Date Plugin.

   */

  public function testMonthDatePlugin() {

    $assert_session = $this->assertSession();

    // Test fallback value.

    $this->drupalGet('test-month-date-plugin');

    $assert_session->statusCodeEquals(200);

    $assert_session->pageTextContains($this->node1->getTitle());

    $assert_session->pageTextContains($this->node2->getTitle());

    // Test 'all' values.

    $this->drupalGet('test-month-date-plugin/all');

    $assert_session->statusCodeEquals(200);

    $assert_session->pageTextContains($this->node1->getTitle());

    $assert_session->pageTextContains($this->node2->getTitle());

    // Test valid month value.

    $this->drupalGet('test-month-date-plugin/10');

    $assert_session->statusCodeEquals(200);

    $assert_session->pageTextContains($this->node1->getTitle());

    $assert_session->pageTextNotContains($this->node2->getTitle());

    // Test query parameter.

    $url = Url::fromUserInput('/test-month-date-plugin', [

      'query' => [

        'month' => 10,

      ],

    ]);

    $this->drupalGet($url);

    $assert_session->statusCodeEquals(200);

    $assert_session->pageTextContains($this->node1->getTitle());

    $assert_session->pageTextNotContains($this->node2->getTitle());

    // Test invalid month name.

    $this->drupalGet('test-month-date-plugin/invalid-month');

    $assert_session->statusCodeEquals(200);

    $assert_session->pageTextNotContains($this->node1->getTitle());

    $assert_session->pageTextNotContains($this->node2->getTitle());

  }

}