Move into nested docroot

web/core/modules/views/tests/themes/views_test_checkboxes_theme/views_test_checkboxes_theme.info.yml

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+name: Views test checkboxes theme
+type: theme
+description: Theme for testing Views rendering of checkboxes.
+version: VERSION
+core: 8.x

web/core/modules/views/tests/themes/views_test_checkboxes_theme/views_test_checkboxes_theme.theme

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+<?php
+
+/**
+ * @file
+ * Changes an exposed "type" filter from a multi-select to checkboxes.
+ */
+
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Changes an exposed "type" filter from a multi-select to checkboxes.
+ */
+function views_test_checkboxes_theme_form_views_exposed_form_alter(&$form, FormStateInterface $form_state) {
+  $form['type']['#type'] = 'checkboxes';
+}

web/core/modules/views/tests/themes/views_test_theme/templates/views-view-field.html.twig

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+{#
+/**
+ * @file
+ * Theme override to display all the fields in a views row.
+ *
+ * The reason for this template is to override the theme function provided by
+ * views to allow tests to run against the twig template.
+ */
+#}
+{% include '@views/views-view-field.html.twig' %}
+Use posts instead of twigs to protect your llamas from escaping the field.

web/core/modules/views/tests/themes/views_test_theme/templates/views-view-fields.html.twig

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+{#
+/**
+ * @file
+ * Theme override to display all the fields in a views row.
+ *
+ * The reason for this template is to override the theme function provided by
+ * views.
+ */
+#}
+{% include '@views/views-view-fields.html.twig' %}
+May the force be with you!

web/core/modules/views/tests/themes/views_test_theme/views_test_theme.info.yml

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+name: Views test theme
+type: theme
+description: Theme for testing Views functionality.
+version: VERSION
+core: 8.x