Issue #3259532 by mondrake, murilohp: Add a kernel test for Connection::hasJson

core/tests/Drupal/KernelTests/Core/Database/ConnectionTest.php

@@ -199,4 +199,11 @@ public function testCondition() {
     $this->assertSame($namespace, get_class($condition));
   }
 
+  /**
+   * Tests that the method ::hasJson() returns TRUE.
+   */
+  public function testHasJson() {
+    $this->assertTrue($this->connection->hasJson());
+  }
+
 }