diff --git a/modules/field/field.test b/modules/field/field.test
index 07d047f0650..1ac788098ec 100644
--- a/modules/field/field.test
+++ b/modules/field/field.test
@@ -712,7 +712,7 @@ class FieldAttachTestCase extends DrupalWebTestCase {
    */
   function testFieldAttachCache() {
     // Initialize random values and a test entity.
-    $entity = field_test_create_stub_entity(1, 1, $this->instance['bundle']);
+    $entity_init = field_test_create_stub_entity(1, 1, $this->instance['bundle']);
     $values = $this->_generateTestFieldValues($this->field['cardinality']);
 
     $noncached_type = 'test_entity';
@@ -720,57 +720,65 @@ class FieldAttachTestCase extends DrupalWebTestCase {
 
 
     // Non-cacheable entity type.
-    $cid = "field:$noncached_type:{$entity->ftid}";
+    $cid = "field:$noncached_type:{$entity_init->ftid}";
 
     // Check that no initial cache entry is present.
     $this->assertFalse(cache_get($cid, 'cache_field'), t('Non-cached: no initial cache entry'));
 
     // Save, and check that no cache entry is present.
+    $entity = clone($entity_init);
     $entity->{$this->field_name} = $values;
     field_attach_insert($noncached_type, $entity);
     $this->assertFalse(cache_get($cid, 'cache_field'), t('Non-cached: no cache entry on insert'));
 
     // Load, and check that no cache entry is present.
+    $entity = clone($entity_init);
     field_attach_load($noncached_type, array($entity->ftid => $entity));
     $this->assertFalse(cache_get($cid, 'cache_field'), t('Non-cached: no cache entry on load'));
 
 
     // Cacheable entity type.
-    $cid = "field:$cached_type:{$entity->ftid}";
+    $cid = "field:$cached_type:{$entity_init->ftid}";
 
     // Check that no initial cache entry is present.
     $this->assertFalse(cache_get($cid, 'cache_field'), t('Cached: no initial cache entry'));
 
     // Save, and check that no cache entry is present.
+    $entity = clone($entity_init);
     $entity->{$this->field_name} = $values;
     field_attach_insert($cached_type, $entity);
     $this->assertFalse(cache_get($cid, 'cache_field'), t('Cached: no cache entry on insert'));
 
     // Load, and check that a cache entry is present with the expected values.
+    $entity = clone($entity_init);
     field_attach_load($cached_type, array($entity->ftid => $entity));
     $cache = cache_get($cid, 'cache_field');
     $this->assertEqual($cache->data[$this->field_name], $values, t('Cached: correct cache entry on load'));
 
     // Update with different values, and check that the cache entry is wiped.
     $values = $this->_generateTestFieldValues($this->field['cardinality']);
+    $entity = clone($entity_init);
     $entity->{$this->field_name} = $values;
     field_attach_update($cached_type, $entity);
     $this->assertFalse(cache_get($cid, 'cache_field'), t('Cached: no cache entry on update'));
 
     // Load, and check that a cache entry is present with the expected values.
+    $entity = clone($entity_init);
     field_attach_load($cached_type, array($entity->ftid => $entity));
     $cache = cache_get($cid, 'cache_field');
     $this->assertEqual($cache->data[$this->field_name], $values, t('Cached: correct cache entry on load'));
 
     // Create a new revision, and check that the cache entry is wiped.
+    $entity_init = field_test_create_stub_entity(1, 2, $this->instance['bundle']);
     $values = $this->_generateTestFieldValues($this->field['cardinality']);
+    $entity = clone($entity_init);
     $entity->{$this->field_name} = $values;
-    $entity->ftvid = 2;
     field_attach_update($cached_type, $entity);
     $cache = cache_get($cid, 'cache_field');
     $this->assertFalse(cache_get($cid, 'cache_field'), t('Cached: no cache entry on new revision creation'));
 
     // Load, and check that a cache entry is present with the expected values.
+    $entity = clone($entity_init);
     field_attach_load($cached_type, array($entity->ftid => $entity));
     $cache = cache_get($cid, 'cache_field');
     $this->assertEqual($cache->data[$this->field_name], $values, t('Cached: correct cache entry on load'));