diff --git a/local_moodleappbehat/fixtures/dummy.pdf b/local_moodleappbehat/fixtures/dummy.pdf
new file mode 100644
index 000000000..774c2ea70
Binary files /dev/null and b/local_moodleappbehat/fixtures/dummy.pdf differ
diff --git a/src/tests/behat/open_files.feature b/src/tests/behat/open_files.feature
index 2eda134f1..9b7885aff 100644
--- a/src/tests/behat/open_files.feature
+++ b/src/tests/behat/open_files.feature
@@ -11,17 +11,17 @@ Feature: It opens files properly.
     And the following "course enrolments" exist:
       | user     | course | role    |
       | student1 | C1     | student |
-    And the following "activities" exist:
+
+  @lms_from3.10
+  Scenario: Open a file
+    Given the following "activities" exist:
       | activity | name     | intro                | display | course | defaultfilename |
       | resource | Test TXT | Test TXT description | 5       | C1     | A txt.txt       |
       | resource | Test RTF | Test RTF description | 5       | C1     | A rtf.rtf       |
       | resource | Test DOC | Test DOC description | 5       | C1     | A doc.doc       |
     And the following config values are set as admin:
       | filetypeexclusionlist | rtf,doc | tool_mobile |
-
-  @lms_from3.10
-  Scenario: Open a file
-    Given I entered the resource activity "Test TXT" on course "Course 1" as "student1" in the app
+    And I entered the resource activity "Test TXT" on course "Course 1" as "student1" in the app
     When I press "Open" in the app
     Then the app should have opened a browser tab with url "^blob:"
 
@@ -57,3 +57,44 @@ Feature: It opens files properly.
     And I press "Test DOC" in the app
     And I press "Open" in the app
     Then I should find "This file may not work as expected on this device" in the app
+
+  Scenario: Open a PDF embedded using an iframe
+    # Using http://webserver directly because $WWWROOT cannot be used in generators or when creating the page manually.
+    Given the following "activities" exist:
+      | activity | idnumber | course | name                   | content                                                                                             |
+      | page     | page1    | C1     | Page with embedded PDF | <iframe src="http://webserver/local/moodleappbehat/fixtures/dummy.pdf" width="100%" height="500"></iframe> |
+      | page     | page2    | C1     | Page with embedded web | <iframe src="https://moodle.org" width="100%" height="500" data-open-external="true"></iframe>      |
+    And the following config values are set as admin:
+      | custommenuitems | PDF item\|http://webserver/local/moodleappbehat/fixtures/dummy.pdf\|embedded | tool_mobile |
+    And I entered the course "Course 1" as "student1" in the app
+
+    When I press "Page with embedded PDF" in the app
+    And I press "Open PDF file" in the app
+    Then the app should have opened a browser tab with url "dummy.pdf"
+
+    When I close the browser tab opened by the app
+    And I press the back button in the app
+    And I press "Page with embedded web" in the app
+    And I press "Open in browser" in the app
+    And I press "OK" in the app
+    Then the app should have opened a browser tab with url "moodle.org"
+
+    When I close the browser tab opened by the app
+    And I switch network connection to offline
+    And I press "Open in browser" in the app
+    Then I should find "There was a problem connecting to the site. Please check your connection and try again." in the app
+
+    When I press "OK" in the app
+    And I press the back button in the app
+    And I press "Page with embedded PDF" in the app
+    And I press "Open PDF file" in the app
+    Then the app should have opened a browser tab with url "^blob"
+
+    When I close the browser tab opened by the app
+    When I switch network connection to wifi
+    And I press the back button in the app
+    And I press the back button in the app
+    And I press "More" in the app
+    And I press "PDF item" in the app
+    And I press "Open PDF file" in the app
+    Then the app should have opened a browser tab with url "dummy.pdf"