Test the filter impact to the new helper

tests/class-two-factor-core.php

@@ -1558,13 +1558,16 @@ public function test_all_sessions_destroyed_when_enabling_2fa_by_admin() {
 
 	public function test_can_filter_registered_providers_for_user() {
 		$user = self::factory()->user->create_and_get();
+		$providers = Two_Factor_Core::get_providers();
 
 		$this->assertEquals(
-			Two_Factor_Core::get_providers(),
+			$providers,
 			Two_Factor_Core::get_supported_providers_for_user( $user ),
 			'All providers are available by default'
 		);
 
+		$this->assertTrue( $providers['Two_Factor_Email']::is_supported_for_user( $user ), 'Email provider is supported by default' );
+
 		add_filter(
 			'two_factor_providers_for_user',
 			function( $providers, $user ) {
@@ -1582,6 +1585,8 @@ function( $providers, $user ) {
 			'Email provider can be disabled for a user'
 		);
 
+		$this->assertFalse( $providers['Two_Factor_Email']::is_supported_for_user( $user ), 'Email provider is disabled if not supported' );
+
 		remove_all_filters( 'two_factor_providers_for_user' );
 	}