diff --git a/tests/unit-tests/order/coupons.php b/tests/unit-tests/order/coupons.php
index c9ad6340075..6d19b04900f 100644
--- a/tests/unit-tests/order/coupons.php
+++ b/tests/unit-tests/order/coupons.php
@@ -19,7 +19,7 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 	public function setUp() {
 		$this->delete_objects();
 
-		$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
+		$_SERVER['REMOTE_ADDR'] = '127.0.0.1'; // @codingStandardsIgnoreLine.
 
 		update_option( 'woocommerce_default_customer_address', 'base' );
 		update_option( 'woocommerce_tax_based_on', 'base' );
@@ -29,13 +29,13 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 		update_post_meta( $product->get_id(), '_price', '1000' );
 		$product = wc_get_product( $product->get_id() );
 
-		$coupon = new WC_Coupon;
+		$coupon = new WC_Coupon();
 		$coupon->set_code( 'test-coupon-1' );
 		$coupon->set_amount( 1.00 );
 		$coupon->set_discount_type( 'fixed_cart' );
 		$coupon->save();
 
-		$coupon2 = new WC_Coupon;
+		$coupon2 = new WC_Coupon();
 		$coupon2->set_code( 'test-coupon-2' );
 		$coupon2->set_amount( 20 );
 		$coupon2->set_discount_type( 'percent' );
@@ -159,7 +159,7 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 	/**
 	 * Test: test_remove_coupon_from_order
 	 */
-	function test_remove_coupon_from_order() {
+	public function test_remove_coupon_from_order() {
 		update_option( 'woocommerce_prices_include_tax', 'yes' );
 		update_option( 'woocommerce_calc_taxes', 'yes' );
 		$this->setUp();
@@ -199,7 +199,7 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 	/**
 	 * Test: test_add_coupon_to_order
 	 */
-	function test_add_coupon_to_order() {
+	public function test_add_coupon_to_order() {
 		update_option( 'woocommerce_prices_include_tax', 'yes' );
 		update_option( 'woocommerce_calc_taxes', 'yes' );
 		$this->setUp();
@@ -207,14 +207,22 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 		$order_id = $this->objects['order']->get_id();
 		$order    = wc_get_order( $order_id );
 
+		$this->assertEquals( '799', $order->get_total(), $order->get_total() );
+
+		/**
+		 * Discount should be based on subtotal unless coupons apply sequencially.
+		 *
+		 * Coupon will therefore discount 200. Compare the total without tax so we can compare the ex tax price and avoid rounding mishaps.
+		 */
 		$order->apply_coupon( 'test-coupon-2' );
-		$this->assertEquals( '639.2', $order->get_total(), $order->get_total() );
+		$this->assertEquals( 401, round( $order->get_total_discount( false ), 2 ), $order->get_total_discount( false ) );
+		$this->assertEquals( 598.99, $order->get_total(), $order->get_total() );
 	}
 
 	/**
 	 * Test: test_remove_coupon_from_order_ex_tax
 	 */
-	function test_remove_coupon_from_order_ex_tax() {
+	public function test_remove_coupon_from_order_ex_tax() {
 		update_option( 'woocommerce_prices_include_tax', 'no' );
 		update_option( 'woocommerce_calc_taxes', 'yes' );
 		$this->setUp();
@@ -254,7 +262,7 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 	/**
 	 * Test: test_add_coupon_to_order_ex_tax
 	 */
-	function test_add_coupon_to_order_ex_tax() {
+	public function test_add_coupon_to_order_ex_tax() {
 		update_option( 'woocommerce_prices_include_tax', 'no' );
 		update_option( 'woocommerce_calc_taxes', 'yes' );
 		$this->setUp();
@@ -263,13 +271,14 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 		$order    = wc_get_order( $order_id );
 
 		$order->apply_coupon( 'test-coupon-2' );
-		$this->assertEquals( '703.12', $order->get_total(), $order->get_total() );
+		$this->assertEquals( 401, $order->get_discount_total(), $order->get_discount_total() );
+		$this->assertEquals( ( 1000 - 401 ) * 1.1, $order->get_total(), $order->get_total() );
 	}
 
 	/**
 	 * Test: test_remove_coupon_from_order_no_tax
 	 */
-	function test_remove_coupon_from_order_no_tax() {
+	public function test_remove_coupon_from_order_no_tax() {
 		update_option( 'woocommerce_prices_include_tax', 'no' );
 		update_option( 'woocommerce_calc_taxes', 'no' );
 		$this->setUp();
@@ -309,7 +318,7 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 	/**
 	 * Test: test_add_coupon_to_order_no_tax
 	 */
-	function test_add_coupon_to_order_no_tax() {
+	public function test_add_coupon_to_order_no_tax() {
 		update_option( 'woocommerce_prices_include_tax', 'no' );
 		update_option( 'woocommerce_calc_taxes', 'no' );
 		$this->setUp();
@@ -318,13 +327,13 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 		$order    = wc_get_order( $order_id );
 
 		$order->apply_coupon( 'test-coupon-2' );
-		$this->assertEquals( '639.2', $order->get_total(), $order->get_total() );
+		$this->assertEquals( '599', $order->get_total(), $order->get_total() );
 	}
 
 	/**
 	 * Test: test_remove_coupon_from_order_no_tax
 	 */
-	function test_remove_coupon_from_order_no_tax_inc_prices_on() {
+	public function test_remove_coupon_from_order_no_tax_inc_prices_on() {
 		update_option( 'woocommerce_prices_include_tax', 'yes' );
 		update_option( 'woocommerce_calc_taxes', 'no' );
 		$this->setUp();
@@ -364,7 +373,7 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 	/**
 	 * Test: test_add_coupon_to_order_no_tax
 	 */
-	function test_add_coupon_to_order_no_tax_inc_prices_on() {
+	public function test_add_coupon_to_order_no_tax_inc_prices_on() {
 		update_option( 'woocommerce_prices_include_tax', 'yes' );
 		update_option( 'woocommerce_calc_taxes', 'no' );
 		$this->setUp();
@@ -373,6 +382,6 @@ class WC_Tests_Order_Coupons extends WC_Unit_Test_Case {
 		$order    = wc_get_order( $order_id );
 
 		$order->apply_coupon( 'test-coupon-2' );
-		$this->assertEquals( '639.2', $order->get_total(), $order->get_total() );
+		$this->assertEquals( '599', $order->get_total(), $order->get_total() );
 	}
 }