diff --git a/src/PHPDraft/Parse/BaseHtmlGenerator.php b/src/PHPDraft/Parse/BaseHtmlGenerator.php
index 862901f5..afd23494 100644
--- a/src/PHPDraft/Parse/BaseHtmlGenerator.php
+++ b/src/PHPDraft/Parse/BaseHtmlGenerator.php
@@ -22,21 +22,21 @@ abstract class BaseHtmlGenerator
      *
      * @var int
      */
-    public $sorting;
+    public int $sorting;
 
     /**
      * JSON representation of an API Blueprint.
      *
-     * @var stdClass
+     * @var object
      */
-    protected $object;
+    protected object $object;
 
     /**
      * Rendered HTML
      *
      * @var string
      */
-    protected $html;
+    protected string $html;
 
     /**
      * Constructor.
diff --git a/src/PHPDraft/Parse/BaseParser.php b/src/PHPDraft/Parse/BaseParser.php
index 0cf98857..840b572a 100644
--- a/src/PHPDraft/Parse/BaseParser.php
+++ b/src/PHPDraft/Parse/BaseParser.php
@@ -24,30 +24,30 @@ abstract class BaseParser
     /**
      * The API Blueprint output (JSON).
      *
-     * @var object
+     * @var object|null
      */
-    public $json;
+    public ?object $json;
 
     /**
      * Temp directory.
      *
      * @var string
      */
-    protected $tmp_dir;
+    protected string $tmp_dir;
 
     /**
      * The API Blueprint input.
      *
      * @var ApibFileParser
      */
-    protected $apib;
+    protected ApibFileParser $apib;
 
     /**
      * BaseParser constructor.
      *
      * @param ApibFileParser $apib API Blueprint text
      *
-     * @return \PHPDraft\Parse\BaseParser
+     * @return self
      */
     public function init(ApibFileParser $apib): self
     {
@@ -114,7 +114,7 @@ public function parseToJson(): object
      *
      * @return void
      */
-    abstract protected function parse();
+    abstract protected function parse(): void;
 
     /**
      * Check if a given parser is available.
diff --git a/src/PHPDraft/Parse/Drafter.php b/src/PHPDraft/Parse/Drafter.php
index 1e8b404a..b6fe2696 100644
--- a/src/PHPDraft/Parse/Drafter.php
+++ b/src/PHPDraft/Parse/Drafter.php
@@ -21,7 +21,7 @@ class Drafter extends BaseParser
      *
      * @var string
      */
-    protected $drafter;
+    protected string $drafter;
 
     /**
      * ApibToJson constructor.
@@ -33,7 +33,11 @@ class Drafter extends BaseParser
     public function init(ApibFileParser $apib): BaseParser
     {
         parent::init($apib);
-        $this->drafter = self::location();
+        $loc = self::location();
+        if ($loc === false) {
+            throw new \UnexpectedValueException("Could not find drafter location!");
+        }
+        $this->drafter = $loc;
 
         return $this;
     }
@@ -41,7 +45,7 @@ public function init(ApibFileParser $apib): BaseParser
     /**
      * Return drafter location if found.
      *
-     * @return bool|string
+     * @return false|string
      */
     public static function location()
     {
@@ -59,7 +63,12 @@ public static function location()
     protected function parse(): void
     {
         shell_exec("{$this->drafter} {$this->tmp_dir}/index.apib -f json -o {$this->tmp_dir}/index.json 2> /dev/null");
-        $this->json = json_decode(file_get_contents($this->tmp_dir . '/index.json'));
+        $content = file_get_contents($this->tmp_dir . '/index.json');
+        if (!is_string($content)) {
+            throw new \RuntimeException('Could not read intermediary APIB file!');
+        }
+
+        $this->json = json_decode($content);
     }
 
     /**
diff --git a/src/PHPDraft/Parse/Tests/BaseParserTest.php b/src/PHPDraft/Parse/Tests/BaseParserTest.php
index 305063e4..19a97d6f 100644
--- a/src/PHPDraft/Parse/Tests/BaseParserTest.php
+++ b/src/PHPDraft/Parse/Tests/BaseParserTest.php
@@ -74,16 +74,6 @@ public function testSetupCorrectly(): void
         $this->assertInstanceOf('\PHPDraft\In\ApibFileParser', $this->get_reflection_property_value('apib'));
     }
 
-    /**
-     * Check if the JSON is empty before parsing
-     *
-     * @covers \PHPDraft\Parse\BaseParser::parseToJson()
-     */
-    public function testPreRunStringIsEmpty(): void
-    {
-        $this->assertEmpty($this->class->json);
-    }
-
     /**
      * Check if parsing the APIB to JSON gives the expected result
      *
diff --git a/src/PHPDraft/Parse/Tests/DrafterAPITest.php b/src/PHPDraft/Parse/Tests/DrafterAPITest.php
index 84cc01f7..eea12384 100644
--- a/src/PHPDraft/Parse/Tests/DrafterAPITest.php
+++ b/src/PHPDraft/Parse/Tests/DrafterAPITest.php
@@ -111,16 +111,6 @@ public function testAvailableSuccess(): void
         $this->unmock_function('curl_exec');
     }
 
-    /**
-     * Check if the JSON is empty before parsing
-     *
-     * @covers \PHPDraft\Parse\DrafterAPI::parseToJson()
-     */
-    public function testPreRunStringIsEmpty(): void
-    {
-        $this->assertEmpty($this->class->json);
-    }
-
     /**
      * Check if parsing the fails without drafter
      *
diff --git a/src/PHPDraft/Parse/Tests/DrafterTest.php b/src/PHPDraft/Parse/Tests/DrafterTest.php
index c1365134..c4172ef2 100644
--- a/src/PHPDraft/Parse/Tests/DrafterTest.php
+++ b/src/PHPDraft/Parse/Tests/DrafterTest.php
@@ -83,16 +83,6 @@ public function testSetupCorrectly(): void
         $this->assertInstanceOf('\PHPDraft\In\ApibFileParser', $this->get_reflection_property_value('apib'));
     }
 
-    /**
-     * Check if the JSON is empty before parsing
-     *
-     * @covers \PHPDraft\Parse\Drafter::parseToJson()
-     */
-    public function testPreRunStringIsEmpty(): void
-    {
-        $this->assertEmpty($this->class->json);
-    }
-
     /**
      * Check if parsing the APIB to JSON gives the expected result
      */
diff --git a/src/PHPDraft/Parse/Tests/HtmlGeneratorTest.php b/src/PHPDraft/Parse/Tests/HtmlGeneratorTest.php
index c9c3322d..1925ddf7 100644
--- a/src/PHPDraft/Parse/Tests/HtmlGeneratorTest.php
+++ b/src/PHPDraft/Parse/Tests/HtmlGeneratorTest.php
@@ -57,9 +57,8 @@ public function tearDown(): void
      */
     public function testSetupCorrectly(): void
     {
-        $property = $this->reflection->getProperty('object');
-        $property->setAccessible(true);
-        $this->assertEquals(json_decode(file_get_contents(TEST_STATICS . '/drafter/json/index.json')), $property->getValue($this->class));
+        $json = json_decode(file_get_contents(TEST_STATICS . '/drafter/json/index.json'));
+        $this->assertEquals($json, $this->get_reflection_property_value('object'));
     }
 
     /**