add tests which check properties/methods

- of page parent information
- of Title and Text property (added: asText())

Author: johguentner

tests/EndpointPagesTest.php

@@ -72,6 +72,8 @@ public function it_returns_page_entity_with_filled_properties()
         $this->assertCount(9, $pageResult->getRawProperties());
         $this->assertCount(9, $pageResult->getProperties());
         $this->assertCount(9, $pageResult->getPropertyKeys());
+        $this->assertSame('database_id', $pageResult->getParentType());
+        $this->assertSame('f2939732-f694-4ce2-b613-f28db6ded673', $pageResult->getParentId());
 
         // check date and datetime properties
         $this->assertTrue($pageResult->getProperty('DateWithTime')->hasTime());

tests/PagePropertyTest.php

@@ -99,6 +99,7 @@ public function it_checks_if_specific_page_property_is_a_valid_text_property()
         $this->assertSame('text', $text->getType());
         $this->assertSame('|Zt@', $text->getId());
         $this->assertSame('this is a nice Text :-)', $text->getPlainText());
+        $this->assertSame('this is a nice Text :-)', $text->asText());
         $this->assertInstanceOf(RichText::class, $text->getRichText());
         $this->assertInstanceOf(RichText::class, $text->getContent());
         $this->assertSame('this is a nice Text :-)', $text->getRichText()->getPlainText());
@@ -149,6 +150,7 @@ public function it_checks_if_specific_page_property_is_a_valid_title_property()
         $this->assertSame('title', $title->getType());
         $this->assertSame('title', $title->getId());
         $this->assertSame('Notion Is Awesome', $title->getPlainText());
+        $this->assertSame('Notion Is Awesome', $title->asText());
         $this->assertInstanceOf(RichText::class, $title->getContent());
         $this->assertSame('Notion Is Awesome', $title->getContent()->getPlainText());
     }