diff --git a/behat.yml b/behat.yml
new file mode 100644
index 0000000..50dada9
--- /dev/null
+++ b/behat.yml
@@ -0,0 +1,31 @@
+# Run silverstripe-gridfieldextensions behat tests with this command
+# Note that silverstripe-gridfieldextensions behat tests require CMS module
+# ========================================================================= #
+# chromedriver
+# vendor/bin/behat @silverstripe-gridfieldextensions
+# ========================================================================= #
+default:
+  suites:
+    silverstripe-gridfieldextensions:
+      paths:
+        - '%paths.modules.silverstripe-gridfieldextensions%/tests/behat/features'
+      contexts:
+        - SilverStripe\Framework\Tests\Behaviour\FeatureContext
+        - SilverStripe\Framework\Tests\Behaviour\CmsFormsContext
+        - SilverStripe\Framework\Tests\Behaviour\CmsUiContext
+        - SilverStripe\BehatExtension\Context\BasicContext
+        - SilverStripe\BehatExtension\Context\LoginContext
+        - SilverStripe\BehatExtension\Context\FixtureContext:
+            - '%paths.modules.silverstripe-gridfieldextensions%/tests/behat/features/files/'
+
+  extensions:
+    SilverStripe\BehatExtension\MinkExtension:
+      default_session: facebook_web_driver
+      javascript_session: facebook_web_driver
+      facebook_web_driver:
+        browser: chrome
+        wd_host: "http://127.0.0.1:9515" #chromedriver port
+
+    SilverStripe\BehatExtension\Extension:
+      screenshot_path: '%paths.base%/artifacts/screenshots'
+      bootstrap_file: vendor/silverstripe/framework/tests/behat/serve-bootstrap.php
diff --git a/composer.json b/composer.json
index 3c1f6af..d164ae7 100644
--- a/composer.json
+++ b/composer.json
@@ -34,7 +34,8 @@
         "squizlabs/php_codesniffer": "^3.7",
         "silverstripe/versioned": "^2",
         "silverstripe/standards": "^1",
-        "phpstan/extension-installer": "^1.3"
+        "phpstan/extension-installer": "^1.3",
+        "silverstripe/frameworktest": "^1"
     },
     "extra": {
         "screenshots": [
diff --git a/tests/behat/features/basic-nested-gridfield.feature b/tests/behat/features/basic-nested-gridfield.feature
new file mode 100644
index 0000000..4d415dc
--- /dev/null
+++ b/tests/behat/features/basic-nested-gridfield.feature
@@ -0,0 +1,143 @@
+Feature: Using Nested GridField with non-hierarchical relational data
+As a content editor
+I want to see all children of non-hierarchical relational data in nested GridField
+
+  Background:
+    Given there are the following SilverStripe\FrameworkTest\Fields\NestedGridField\LeafNode records
+    """
+    leaf-node-1:
+      Name: "Leaf Node One"
+      Category: "A"
+    leaf-node-2:
+      Name: "Leaf Node Two"
+      Category: "D"
+    leaf-node-3:
+      Name: "Leaf Node Three"
+      Category: "C"
+    leaf-node-4:
+      Name: "Leaf Node Four"
+      Category: "B"
+    """
+    Given there are the following SilverStripe\FrameworkTest\Fields\NestedGridField\BranchNode records
+    """
+    branch-node-1:
+      Name: "Branch Node One"
+      Category: "D"
+      LeafNodes:
+        - =>SilverStripe\FrameworkTest\Fields\NestedGridField\LeafNode.leaf-node-1
+        - =>SilverStripe\FrameworkTest\Fields\NestedGridField\LeafNode.leaf-node-2
+        - =>SilverStripe\FrameworkTest\Fields\NestedGridField\LeafNode.leaf-node-3
+        - =>SilverStripe\FrameworkTest\Fields\NestedGridField\LeafNode.leaf-node-4
+    branch-node-2:
+      Name: "Branch Node Two"
+      Category: "C"
+    branch-node-3:
+      Name: "Branch Node Three"
+      Category: "B"
+    branch-node-4:
+      Name: "Branch Node Four"
+      Category: "A"
+    """
+    And there are the following SilverStripe\FrameworkTest\Fields\NestedGridField\RootNode records
+    """
+    root-node-1:
+      Name: "Root Node One"
+      BranchNodes:
+        - =>SilverStripe\FrameworkTest\Fields\NestedGridField\BranchNode.branch-node-1
+        - =>SilverStripe\FrameworkTest\Fields\NestedGridField\BranchNode.branch-node-2
+    root-node-2:
+      Name: "Root Node Two"
+      BranchNodes:
+        - =>SilverStripe\FrameworkTest\Fields\NestedGridField\BranchNode.branch-node-3
+        - =>SilverStripe\FrameworkTest\Fields\NestedGridField\BranchNode.branch-node-4
+    """
+    And there are the following SilverStripe\FrameworkTest\Fields\NestedGridField\NonRelationalData records
+    """
+    data-1:
+      Name: "Data Set 1"
+    """
+    And I go to "/dev/build?flush"
+    And the "group" "EDITOR" has permissions "Access to 'Pages' section" and "Access to 'Nested GridField Section' section" and "Access to 'Security' section"and "TEST_DATAOBJECT_EDIT"
+    And I am logged in as a member of "EDITOR" group
+    And I go to "/admin/nested-gridfield-section"
+
+  Scenario: I want to see all items in nested GridField
+    Given I should see "Root Node One" in the ".ss-gridfield-item.first.odd" element
+      And I should see "Root Node Two" in the ".ss-gridfield-item.last.even" element
+      When I click on the ".ss-gridfield-item.first.odd button" element
+      And I should see "Branch Node One" in the ".nested-gridfield.odd" element
+      And I should see "Branch Node Two" in the ".nested-gridfield.odd" element
+      When I click on the ".nested-gridfield.odd .ss-gridfield-items button" element
+      And I should see "Leaf Node One" in the ".nested-gridfield.odd" element
+      And I should see "Leaf Node Two" in the ".nested-gridfield.odd" element
+      And I should see "Leaf Node Three" in the ".nested-gridfield.odd" element
+      And I should see "Leaf Node Four" in the ".nested-gridfield.odd" element
+
+  Scenario: I want to edit and delete items in nested GridField
+    Given I should see "Root Node Two" in the ".ss-gridfield-item.last.even" element
+      When I click on the ".ss-gridfield-item.last.even button" element
+      And I should see "Branch Node Three" in the ".nested-gridfield.even .ss-gridfield-item.first.odd" element
+      And I should see "Branch Node Four" in the ".nested-gridfield.even .ss-gridfield-item.last.even" element
+      When I click on the ".nested-gridfield.even .ss-gridfield-item.first.odd" element
+      And I fill in "Name" with "New Branch Node"
+      And I press the "Save" button
+      Then I click on the ".toolbar__back-button" element
+      And I should see "New Branch Node" in the ".nested-gridfield.even .ss-gridfield-item.first.odd" element
+      And I should see "Branch Node Four" in the ".nested-gridfield.even .ss-gridfield-item.last.even" element
+      And I click on the ".nested-gridfield.even .ss-gridfield-item.last.even button[aria-label='View actions']" element
+      And I click on the ".nested-gridfield.even .ss-gridfield-item.last.even button.action--delete" element, confirming the dialog
+      And I should see "New Branch Node" in the ".nested-gridfield.even .ss-gridfield-item.first.odd" element
+      And I should not see "Branch Node Four"
+
+  Scenario: I can to sort items in nested GridField
+    Given I should see "Root Node One" in the ".ss-gridfield-item.first.odd" element
+      And I should see "Root Node Two" in the ".ss-gridfield-item.last.even" element
+      When I click on the ".ss-gridfield-item.first.odd button" element
+      And I should see "Branch Node One" in the ".nested-gridfield.odd .ss-gridfield-item.first.odd" element
+      And I should see "Branch Node Two" in the ".nested-gridfield.odd .ss-gridfield-item.last.even" element
+      Then I click on the ".nested-gridfield.odd button[value='Category']" element
+      And I should see "Branch Node Two" in the ".nested-gridfield.odd .ss-gridfield-item.first.odd" element
+      And I should see "Branch Node One" in the ".nested-gridfield.odd .ss-gridfield-item.last.even" element
+      When I click on the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(2) button" element
+      And I should see "Leaf Node One" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item:nth-of-type(1)" element
+      And I should see "Leaf Node Two" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item:nth-of-type(2)" element
+      And I should see "Leaf Node Three" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item:nth-of-type(3)" element
+      And I should see "Leaf Node Four" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item:nth-of-type(4)" element
+      ## Category: Leaf Node 1 -> A, Leaf Node 4 -> B, Leaf Node 3 -> C, Leaf Node 4 -> D
+      ## First request returns ASC order   
+      Then I click on the ".nested-gridfield.odd .nested-gridfield button[value='Category']" element
+      And I should see "Leaf Node One" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item.first.odd" element
+      And I should see "Leaf Node Four" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item:nth-of-type(2)" element
+      And I should see "Leaf Node Three" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item:nth-of-type(3)" element
+      And I should see "Leaf Node Two" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item.last.even" element
+      ## Second request returns DESC order 
+      And I click on the ".nested-gridfield.odd .nested-gridfield button[value='Category']" element
+      And I should see "Leaf Node Two" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item.first.odd" element
+      And I should see "Leaf Node Three" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item:nth-of-type(2)" element
+      And I should see "Leaf Node Four" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item:nth-of-type(3)" element
+      And I should see "Leaf Node One" in the ".nested-gridfield.odd .nested-gridfield .ss-gridfield-item.last.even" element
+
+  Scenario: I can to filter items in nested GridField
+    Given I should see "Root Node One" in the ".ss-gridfield-item.first.odd" element
+      When I click on the ".ss-gridfield-item.first.odd button" element
+      And I should see "Branch Node One" in the ".nested-gridfield.odd .ss-gridfield-item.first.odd" element
+      And I should see "Branch Node Two" in the ".nested-gridfield.odd .ss-gridfield-item.last.even" element
+      Then I click on the ".nested-gridfield.odd button[title='Open search and filter']" element
+      Then I click on the ".nested-gridfield.odd button[title='Advanced']" element
+      And I fill in "Search__Name" with "One"
+      And I press the "Search" button
+      And I should see "Branch Node One" in the ".nested-gridfield.odd .ss-gridfield-item.first.odd" element
+      And I should not see "Branch Node Two"
+
+Scenario: I want to see all non-relational data in nested GridField
+    Given I go to "/admin/nested-gridfield-section/non-relational-data"
+      And I should see "Data Set 1" in the ".ss-gridfield-item.first.odd" element
+      When I click on the ".ss-gridfield-item:nth-of-type(1) button" element
+      Then I should see "Walmart" in the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(1)" element
+      And I should see "ExxonMobil" in the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(2)" element
+      And I should see "Royal Dutch Shell" in the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(3)" element
+      And I should see "BP" in the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(4)" element
+      And I should see "Sinopec" in the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(5)" element
+      Then I click on the ".nested-gridfield.odd button[value='Name']" element
+      Then I should see "BP" in the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(1)" element
+      And I should see "Walmart" in the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(5)" element
diff --git a/tests/behat/features/hierarchical-nested-gridfield.feature b/tests/behat/features/hierarchical-nested-gridfield.feature
new file mode 100644
index 0000000..19e9ce2
--- /dev/null
+++ b/tests/behat/features/hierarchical-nested-gridfield.feature
@@ -0,0 +1,61 @@
+Feature: Using Nested GridField with hierarchical relational data
+As a content editor
+I want to see all children of hierarchical relational data in nested GridField
+
+  Background:
+    Given I add an extension "SilverStripe\FrameworkTest\Fields\NestedGridField\SecurityAdminExtension" to the "SilverStripe\Admin\SecurityAdmin" class
+    And there are the following SilverStripe\Security\Member records
+    """
+    Adam:
+      Name: "Smith"
+    Jim:
+      Name: "Morrison"
+    Tom:
+      Name: "Ford"
+    James:
+      Name: "Dean"
+    """
+    Given there are the following SilverStripe\Security\Group records
+    """
+    group-1:
+      Title: "Group One"
+      Members:
+        - =>SilverStripe\Security\Member.Adam
+        - =>SilverStripe\Security\Member.Jim
+        - =>SilverStripe\Security\Member.Tom
+        - =>SilverStripe\Security\Member.James
+    group-2:
+      Title: "Group Two"
+    """
+    And I go to "/dev/build?flush"
+    And the "group" "EDITOR" has permissions "Access to 'Pages' section" and "Access to 'Security' section"
+    And I am logged in as a member of "EDITOR" group
+    And I go to "/admin/security/groups"
+
+  Scenario: I want to see all items in nested GridField
+    Given I should see "Group One" in the ".ss-gridfield-item:nth-of-type(1)" element
+      And I should see "Group Two" in the ".ss-gridfield-item:nth-of-type(2)" element
+      When I click on the ".ss-gridfield-item.first.odd button" element
+      And I should see "Adam" in the ".nested-gridfield.odd" element
+      And I should see "Jim" in the ".nested-gridfield.odd" element
+      And I should see "Tom" in the ".nested-gridfield.odd" element
+      And I should see "James" in the ".nested-gridfield.odd" element
+
+  Scenario: I want to edit and delete items in nested GridField
+    Given I should see "Group One" in the ".ss-gridfield-item:nth-of-type(1)" element
+      When I click on the ".ss-gridfield-item:nth-of-type(1) button" element
+      Then I click on the ".nested-gridfield.odd button[value='First Name']" element
+      And I should see "Adam" in the ".nested-gridfield.odd .ss-gridfield-item.first.odd" element
+      And I should see "James" in the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(2)" element
+      And I should see "Jim" in the ".nested-gridfield.odd .ss-gridfield-item:nth-of-type(3)" element
+      And I should see "Tom" in the ".nested-gridfield.odd .ss-gridfield-item.last.even" element
+      When I click on the ".nested-gridfield.odd .ss-gridfield-item.first.odd" element
+      And I fill in "Name" with "John"
+      And I press the "Save" button
+      Then I click on the ".toolbar__back-button" element
+      Then I click on the ".nested-gridfield.odd button[value='Surname']" element
+      And I should see "James" in the ".nested-gridfield.odd .ss-gridfield-item.first.odd" element
+      And I should see "John" in the ".nested-gridfield.odd .ss-gridfield-item.last.even" element
+      And I click on the ".nested-gridfield.odd .ss-gridfield-item.last.even button[aria-label='View actions']" element
+      And I click on the ".nested-gridfield.odd .ss-gridfield-item.last.even button.action--delete" element, confirming the dialog
+      And I should not see "John"