Add very broad integration test to get some coverage.

.travis.yml

@@ -26,7 +26,7 @@ before_script:
   - ln -s $repo $root/sites/all/modules/webform_paymethod_select
   - cd $root
   - drush dl ctools currency entity jquery_update little_helpers-2.0-alpha3 payment payment_context psr0 views webform
-  - drush --yes pm-enable webform_paymethod_select
+  - drush --yes pm-enable webform_paymethod_select wps_test_method
 
 script:
   - cd $repo

tests/WebformPaymentTest.php

@@ -0,0 +1,67 @@
+<?php
+
+use Upal\DrupalUnitTestCase;
+
+/**
+ * Integration test for webform_paymethod_select.
+ */
+class WebformPaymentTest extends DrupalUnitTestCase {
+
+  /**
+   * Prepare a test node.
+   */
+  public function setUp() {
+    parent::setUp();
+    $controller = payment_method_controller_load(wps_test_method_payment_method_controller_info()[0]);
+    $method = entity_create('payment_method', ['controller' => $controller]);
+    entity_save('payment_method', $method);
+    $this->method = $method;
+
+    module_load_include('components.inc', 'webform', 'includes/webform');
+    $node = (object) ['type' => 'webform'];
+    node_object_prepare($node);
+    $node->webform['components'][1] = [
+      'type' => 'paymethod_select',
+      'pid' => 0,
+      'form_key' => 'paymethod_select',
+      'name' => 'Pay',
+      'weight' => 0,
+      'extra' => [
+        'selected_payment_methods' => [$method->pmid => $method->pmid],
+      ],
+    ];
+    foreach ($node->webform['components'] as &$c) {
+      webform_component_defaults($c);
+    }
+    node_save($node);
+    $this->node = node_load($node->nid);
+    $GLOBALS['conf']['webform_tracking_mode'] = '<none>';
+  }
+
+  /**
+   * Test a simple dummy payment.
+   */
+  public function testPayment() {
+    $form_state['values']['submitted']['paymethod_select']['payment_method_all_forms'][$this->method->pmid] = [
+      'validate_timeout' => 0,
+    ];
+    $form_state['values']['op'] = 'Submit';
+    $form_state['values']['details']['sid'] = NULL;
+    drupal_form_submit("webform_client_form_{$this->node->nid}", $form_state, $this->node);
+    $submissions = webform_get_submissions(['nid' => $this->node->nid]);
+    $this->assertCount(1, $submissions);
+    $submission = reset($submissions);
+    $payment = entity_load_single('payment', $submission->data[1][0]);
+    $this->assertNotEmpty($payment);
+  }
+
+  /**
+   * Remove the test node.
+   */
+  public function tearDown() {
+    entity_delete('payment_method', $this->method->pmid);
+    node_delete($this->node->nid);
+    parent::tearDown();
+  }
+
+}