diff --git a/tests/phpunit/tests/theme/getAllowedFilters.php b/tests/phpunit/tests/theme/getAllowedFilters.php
new file mode 100644
index 0000000000..11a498ae40
--- /dev/null
+++ b/tests/phpunit/tests/theme/getAllowedFilters.php
@@ -0,0 +1,35 @@
+<?php
+/**
+ * Tests specific to the filtering of `WP_Theme::get_allowed()` and related functions.
+ *
+ * @group themes
+ */
+class Tests_WP_Theme_Get_Allowed_Filters extends WP_UnitTestCase {
+	/**
+	 * @array List of themes allowed before filters are applied.
+	 */
+	protected $default_allowed;
+
+	/**
+	 * Test the `allowed_themes` filter, which filters themes allowed on a network.
+	 */
+	public function test_wp_theme_get_allowed_with_allowed_themes_filter() {
+		$blog_id = 1;
+
+		$this->default_allowed = WP_Theme::get_allowed( $blog_id );
+
+		add_filter( 'allowed_themes', array( $this, 'filter_allowed_themes' ), 10 );
+		$allowed = WP_Theme::get_allowed( $blog_id );
+		remove_filter( 'allowed_themes', array( $this, 'filter_allowed_themes' ), 10 );
+
+		$expected = $this->default_allowed + array( 'allow-on-network' => true );
+
+		$this->assertEquals( $expected, $allowed );
+	}
+
+	public function filter_allowed_themes( $allowed_themes ) {
+		$allowed_themes['allow-on-network'] = true;
+
+		return $allowed_themes;
+	}
+}
\ No newline at end of file