Support single address fields in WrapperField.

src/CRM/Export/WrapperField.php

@@ -11,17 +11,25 @@ public function __construct($key) {
     $this->key = $key;
   }
 
+  /**
+   * Get value(s) for this field.
+   *
+   * @return mixed
+   *   - NULL if the field doesn’t exist.
+   *   - A single field value if $delta is given and not NULL.
+   *   - All values as an array if $delta is NULL.
+   */
   public function value($delta = 0) {
     $w = $this->exporter->getWrappedContact();
-    if ($w->__isset($this->key)) {
-      $value = $w->{$this->key}->value();
-      if (isset($delta) && is_array($value) && isset($value[$delta])) {
-        return $value[$delta];
-      }
-      return $value;
+    if (!$w->__isset($this->key)) {
+      return NULL;
+    }
+    $field = $w->{$this->key};
+    if ($field instanceof \EntityListWrapper) {
+      return is_null($delta) ? $field->value() : $field->get($delta)->value();
     }
     else {
-      return NULL;
+      return is_null($delta) ? [$field->value()] : $field->value();
     }
   }
 

test/CRM/Export/WrapperFieldTest.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Drupal\campaignion\CRM\Export;
+
+use Drupal\campaignion\CRM\ExporterBase;
+
+/**
+ * Test the WrapperField exporter.
+ */
+class WrapperFieldTest extends \DrupalUnitTestCase {
+
+  /**
+   * Prepare a contact and exporter object for testing.
+   *
+   * We use the contact type provided by the campaignion_test module here.
+   */
+  public function setUp() {
+    $this->contact = entity_create('redhen_contact', ['type' => 'contact']);
+    $w = $this->contact->wrap();
+    $w->field_address->set([[
+      'country' => 'GB',
+    ]]);
+    $w->field_gender->set('o');
+    $this->exporter = new ExporterBase([]);
+    $this->exporter->setContact($this->contact);
+  }
+
+  /**
+   * Test getting values from a multi-value field.
+   */
+  public function testMultiValueField() {
+    $w = new WrapperField('field_address');
+    $w->setExporter($this->exporter);
+    $this->assertEqual(['country' => 'GB'], $w->value());
+    $this->assertEqual(['country' => 'GB'], $w->value(0));
+    $this->assertEqual([['country' => 'GB']], $w->value(NULL));
+    $this->assertNull($w->value(1));
+  }
+
+  /**
+   * Test getting values from a single value field.
+   */
+  public function testSingleValueField() {
+    $w = new WrapperField('field_gender');
+    $w->setExporter($this->exporter);
+    $this->assertEqual('o', $w->value());
+    $this->assertEqual('o', $w->value(0));
+    $this->assertEqual(['o'], $w->value(NULL));
+    $this->assertEqual('o', $w->value(1));
+  }
+
+}