diff --git a/tests/api_objects.test b/tests/api_objects.test
index 194c369..2022aa8 100644
--- a/tests/api_objects.test
+++ b/tests/api_objects.test
@@ -21,7 +21,7 @@ class ApiBranchCreation extends ApiTestCase {
     // Make sure we have the right number of doc objects.
     $branch = $this->getBranch();
     $count = db_result(db_query("SELECT count(*) FROM {api_documentation} WHERE branch_id = %d", $branch->branch_id));
-    $this->assertEqual($count, 26, 'Found ' . $count . ' documentation objects.');
+    $this->assertEqual($count, 32, 'Found ' . $count . ' documentation objects.');
 
     // Check sample.php
     $object = api_filename_load('sample.php', $branch->project, $branch->branch_name);
diff --git a/tests/sample/sample.php b/tests/sample/sample.php
index 9c5318b..1811f8b 100644
--- a/tests/sample/sample.php
+++ b/tests/sample/sample.php
@@ -68,6 +68,10 @@ function sample_function($parameter, $complex_parameter) {
 }
 
 /**
+ * @} end samples
+ */
+
+/**
  * Function that has classes for parameter and return value.
  *
  * @param SubSample $parameter
@@ -75,15 +79,13 @@ function sample_function($parameter, $complex_parameter) {
  *
  * @return SampleInterface
  *   This return value should link to the interface.
+ *
+ * @ingroup samples
  */
 function sample_class_function($parameter) {
 }
 
 /**
- * @} end samples
- */
-
-/**
  * For testing duplicate function name linking.
  */
 function duplicate_function() {
@@ -93,3 +95,71 @@ function duplicate_function() {
  * For testing duplicate constant linking.
  */
 define('DUPLICATE_CONSTANT');
+
+/**
+ * Respond to sample updates.
+ *
+ * This hook is for testing hook linking.
+ */
+function hook_sample_name() {
+}
+
+/**
+ * Returns HTML for a sample.
+ *
+ * This theme function is for testing linking in theme().
+ *
+ * @param $variables
+ *   An associative array containing:
+ *   - foo: The foo object that is being formatted.
+ *   - show_bar: TRUE to show the bar component, FALSE to omit it.
+ */
+function theme_sample_one($variables) {
+}
+
+/**
+ * Returns HTML for another sample.
+ *
+ * This theme function is for testing linking in theme(). It should not be
+ * linked, because of the sample-two.tpl.php file, which has higher priority.
+ *
+ * @param $variables
+ *   An associative array containing:
+ *   - foo: The foo object that is being formatted.
+ *   - show_bar: TRUE to show the bar component, FALSE to omit it.
+ */
+function theme_sample_two($variables) {
+}
+
+/**
+ * Does something interesting, to test in-code linking.
+ */
+function sample_in_code_links() {
+  // Should link to function.
+  $foo = sample_function();
+  // Should link to theme function.
+  $bar = theme('sample_one', $foo);
+  // Should link to theme template, not function, though both exist.
+  $baz = theme('sample_two', $foo);
+  // Should link to theme template.
+  $boo = theme('sample_three');
+  // Should link to hook.
+  $x = module_invoke_all('sample_name', $foo, $baz);
+  $stuff = '';
+  // Should link to hook.
+  foreach (module_implements('sample_name') as $mod) {
+    // Should link to hook.
+    module_invoke($mod, 'sample_name', $baz);
+  }
+
+  // Should link to search for this function.
+  $z = duplicate_function();
+
+  // Should link to class.
+  $j = new SubSample();
+
+  // Should link to constant.
+  $k = SAMPLE_CONSTANT;
+  // Should link to search for this constant.
+  $l = DUPLICATE_CONSTANT;
+}