MOBILE-3320 behat: Test activity deep links

tests/behat/behat_app.php

@@ -532,6 +532,24 @@ class behat_app extends behat_base {
         $this->wait_for_pending_js();
     }
 
+    /**
+     * Replace arguments from the content in the given activity field.
+     *
+     * @Given /^I replace the arguments in "([^"]+)" "([^"]+)"$/
+     */
+    public function i_replace_arguments_in_the_activity(string $idnumber, string $field) {
+        global $DB;
+
+        $coursemodule = $DB->get_record('course_modules', compact('idnumber'));
+        $module = $DB->get_record('modules', ['id' => $coursemodule->module]);
+        $activity = $DB->get_record($module->name, ['id' => $coursemodule->instance]);
+
+        $DB->update_record($module->name, [
+            'id' => $coursemodule->instance,
+            $field => $this->replace_arguments($activity->{$field}),
+        ]);
+    }
+
     /**
      * Opens a custom link.
      *
@@ -889,4 +907,31 @@ class behat_app extends behat_base {
         return str_replace('$WWWROOT', $CFG->behat_wwwroot, $text);
     }
 
+    /**
+     * Replace arguments with the format "${activity:field}" from a string, where "activity" is
+     * the idnumber of an activity and "field" is the activity's field to get replacement from.
+     *
+     * At the moment, the only field supported is "cmid", the id of the course module for this activity.
+     *
+     * @param string $text Original text.
+     * @return string Text with arguments replaced.
+     */
+    protected function replace_arguments(string $text): string {
+        global $DB;
+
+        preg_match_all("/\\$\\{([^:}]+):([^}]+)\\}/", $text, $matches);
+
+        foreach ($matches[0] as $index => $match) {
+            switch ($matches[2][$index]) {
+                case 'cmid':
+                    $coursemodule = $DB->get_record('course_modules', ['idnumber' => $matches[1][$index]]);
+                    $text = str_replace($match, $coursemodule->id, $text);
+
+                    break;
+            }
+        }
+
+        return $text;
+    }
+
 }

tests/behat/navigation_activities.feature

@@ -0,0 +1,32 @@
+@app @javascript
+Feature: It navigates properly within activities.
+
+  Background:
+    Given the following "users" exist:
+      | username |
+      | student  |
+    And the following "courses" exist:
+      | fullname | shortname |
+      | Course 1 | C1        |
+    And the following "course enrolments" exist:
+      | user    | course | role    |
+      | student | C1     | student |
+    And the following "activities" exist:
+      | activity   | idnumber | course | name  | intro             | content |
+      | label      | label    | C1     | Label | Label description | -       |
+      | page       | page     | C1     | Page  | -                 | <a href="/mod/label/view.php?id=${label:cmid}">Go to label</a> |
+    And I replace the arguments in "page" "content"
+
+  Scenario: Navigates using deep links
+    When I enter the app
+    And I log in as "student"
+    And I press "Course 1" in the app
+    And I press "Page" in the app
+    And I press "Go to label" in the app
+    Then I should find "Label description" in the app
+
+    When I press the back button in the app
+    Then I should find "Go to label" in the app
+
+    When I press the back button in the app
+    Then I should find "Label description" in the app