Unit Tests: wrote cart test_get_coupons method.

tests/unit-tests/cart.php

@@ -510,4 +510,28 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 		WC_Helper_Product::delete_product( $product->id );
 	}
 
+	/**
+	 * Test cart coupons
+	 */
+	public function test_get_coupons() {
+
+		// Create coupon
+		$coupon = WC_Helper_Coupon::create_coupon();
+
+		// Add coupon
+		WC()->cart->add_discount( $coupon->code );
+
+		$this->assertEquals( count( WC()->cart->get_coupons() ), 1 );
+
+		// Clean up the cart
+		WC()->cart->empty_cart();
+
+		// Remove coupons
+		WC()->cart->remove_coupons();
+
+		// Delete coupon
+		WC_Helper_Coupon::delete_coupon( $coupon->id );
+
+	}
+
 }