diff -u b/core/modules/breakpoint/lib/Drupal/breakpoint/Entity/Breakpoint.php b/core/modules/breakpoint/lib/Drupal/breakpoint/Entity/Breakpoint.php
--- b/core/modules/breakpoint/lib/Drupal/breakpoint/Entity/Breakpoint.php
+++ b/core/modules/breakpoint/lib/Drupal/breakpoint/Entity/Breakpoint.php
@@ -302,22 +302,6 @@
     }
 
     /**
-     * @param string $uuid
-     */
-    public function setUuid($uuid)
-    {
-        $this->uuid = $uuid;
-    }
-
-    /**
-     * @return string
-     */
-    public function getUuid()
-    {
-        return $this->uuid;
-    }
-
-    /**
      * @param string $sourceType
      */
     public function setSourceType($sourceType)
@@ -398,22 +382,6 @@
     }
 
     /**
-     * @param string $langcode
-     */
-    public function setLangcode($langcode)
-    {
-        $this->langcode = $langcode;
-    }
-
-    /**
-     * @return string
-     */
-    public function getLangcode()
-    {
-        return $this->langcode;
-    }
-
-    /**
      * @param string $label
      */
     public function setLabel($label)
@@ -430,18 +398,2 @@
     }
-
-    /**
-     * @param string $id
-     */
-    public function setId($id)
-    {
-        $this->id = $id;
-    }
-
-    /**
-     * @return string
-     */
-    public function getId()
-    {
-        return $this->id;
-    }
 }
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/breakpoint/tests/Drupal/breakpoint/Tests/BreakpointAPITest.php
@@ -0,0 +1,51 @@
+<?php
+/**
+ * @file
+ * Definition of Drupal\breakpoint\Tests\BreakpointAPITest.
+ */
+
+namespace Drupal\breakpoint\Tests;
+
+use Drupal\Tests\UnitTestCase;
+use Drupal\breakpoint\Entity\Breakpoint;
+use Drupal\breakpoint\InvalidBreakpointMediaQueryException;
+
+/**
+ * Tests for media queries in a breakpoint.
+ *
+ * @group Breakpoint
+ */
+class BreakpointAPITest extends UnitTestCase {
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Breakpoint API tests',
+      'description' => 'Test validation of class properties.',
+      'group' => 'Breakpoint',
+    );
+  }
+
+  /**
+   * Test property setters and getters.
+   */
+  public function testProperties() {
+    $breakpoint = new Breakpoint( array(), 'Breakpoint');
+
+    // Properties to test with some random data.
+    // i.e setLabel($randomdata) and getLabel()
+    $properties = array(
+      'Label' => $this->getRandomGenerator()->name(16),
+      'MediaQuery' => $this->getRandomGenerator()->string(16),
+      'Multipliers' => array($this->getRandomGenerator()->string(16),$this->getRandomGenerator()->string(16)),
+      'Name' => $this->getRandomGenerator()->name(16),
+      'Source' => $this->getRandomGenerator()->name(16),
+      'SourceType' => $this->getRandomGenerator()->name(16),
+      'Weight' => mt_rand(-40, 40),
+    );
+
+    foreach($properties as $name => $value) {
+      $breakpoint->{'set'.$name}($value);
+      $this->assertEquals($value, $breakpoint->{'get'.$name}(), 'breakpoint_property: set'. $name .' and get'. $name);
+    }
+  }
+}