Fix schema and parser test

Author: neomerx

tests/Data/CommentSchema.php

@@ -53,7 +53,7 @@ public function getRelationships($comment, array $includeRelationships = [])
     {
         assert('$comment instanceof '.Comment::class);
 
-        if (isset($includeRelationships[Comment::LINK_AUTHOR]) === false) {
+        if (isset($includeRelationships[Comment::LINK_AUTHOR]) === true) {
             $data = $comment->{Comment::LINK_AUTHOR};
         } else {
             // issue #75 https://github.com/neomerx/json-api/issues/75

tests/Encoder/Parser/ParserTest.php

@@ -65,6 +65,11 @@ class ParserTest extends BaseTestCase
      */
     private $authorAttr;
 
+    /**
+     * @var array
+     */
+    private $authorAttrNull;
+
     /**
      * @var array
      */
@@ -132,6 +137,11 @@ protected function setUp()
             Author::ATTRIBUTE_LAST_NAME  => $this->author->{Author::ATTRIBUTE_LAST_NAME},
         ];
 
+        $this->authorAttrNull = [
+            Author::ATTRIBUTE_FIRST_NAME => null,
+            Author::ATTRIBUTE_LAST_NAME  => null,
+        ];
+
         $this->commAttr5 = [
             Comment::ATTRIBUTE_BODY => $this->comments[0]->{Comment::ATTRIBUTE_BODY},
         ];
@@ -204,15 +214,15 @@ public function testParseObjectWithCircularReferences()
         $start    = ParserReplyInterface::REPLY_TYPE_RESOURCE_STARTED;
         $complete = ParserReplyInterface::REPLY_TYPE_RESOURCE_COMPLETED;
         $expected = [
-            //          level link name   type        id  attributes         meta
-            [$start,    1,    '',         'people',   9,  $this->authorAttr, null],
-            [$start,    2,    'comments', 'comments', 5,  $this->commAttr5,  null],
-            [$start,    3,    'author',   'people',   9,  $this->authorAttr, null],
-            [$complete, 2,    'comments', 'comments', 5,  $this->commAttr5,  null],
-            [$start,    2,    'comments', 'comments', 12, $this->commAttr12, null],
-            [$start,    3,    'author',   'people',   9,  $this->authorAttr, null],
-            [$complete, 2,    'comments', 'comments', 12, $this->commAttr12, null],
-            [$complete, 1,    '',         'people',   9,  $this->authorAttr, null],
+            //          level link name   type        id  attributes             meta
+            [$start,    1,    '',         'people',   9,  $this->authorAttr,     null],
+            [$start,    2,    'comments', 'comments', 5,  $this->commAttr5,      null],
+            [$start,    3,    'author',   'people',   9,  $this->authorAttrNull, null],
+            [$complete, 2,    'comments', 'comments', 5,  $this->commAttr5,      null],
+            [$start,    2,    'comments', 'comments', 12, $this->commAttr12,     null],
+            [$start,    3,    'author',   'people',   9,  $this->authorAttrNull, null],
+            [$complete, 2,    'comments', 'comments', 12, $this->commAttr12,     null],
+            [$complete, 1,    '',         'people',   9,  $this->authorAttr,     null],
         ];
 
         $allReplies = [];