Update payment method configuration tests after #4415 (#4419)

Author: daledupreez

tests/phpunit/test-class-wc-stripe-payment-method-configurations.php

@@ -9,7 +9,33 @@ class WC_Stripe_Payment_Method_Configurations_Test extends WP_UnitTestCase {
 	 * @return void
 	 */
 	public function test_get_parent_configuration_id() {
-		$this->assertNull( WC_Stripe_Payment_Method_Configurations::get_parent_configuration_id() );
+		$initial_settings = WC_Stripe_Helper::get_stripe_settings();
+
+		WC_Stripe_Helper::update_main_stripe_settings(
+			array_merge(
+				$initial_settings,
+				[ 'testmode' => 'yes' ]
+			)
+		);
+
+		$this->assertEquals(
+			WC_Stripe_Payment_Method_Configurations::TEST_MODE_CONFIGURATION_PARENT_ID,
+			WC_Stripe_Payment_Method_Configurations::get_parent_configuration_id()
+		);
+
+		WC_Stripe_Helper::update_main_stripe_settings(
+			array_merge(
+				$initial_settings,
+				[ 'testmode' => 'no' ]
+			)
+		);
+
+		$this->assertEquals(
+			WC_Stripe_Payment_Method_Configurations::LIVE_MODE_CONFIGURATION_PARENT_ID,
+			WC_Stripe_Payment_Method_Configurations::get_parent_configuration_id()
+		);
+
+		WC_Stripe_Helper::update_main_stripe_settings( $initial_settings );
 	}
 
 	/**