feat(tiered_pricing): 🔵 refactoring implementation first pricing range

Author: oflorez1381

exercises/tiered_pricing/solutions/oflorez/src/main/java/tv/codely/checkout/TieredPricing.java

@@ -1,8 +1,13 @@
 package tv.codely.checkout;
 
 public class TieredPricing {
-    public int calculateTotalPrice(int i) {
-        if (i == 2) return 598;
-        return 299;
+
+    public static final int FIRST_RANGE_UNIT_PRICE = 299;
+    public static final int FIRST_RANGE_LOWER_LIMIT = 1;
+    public static final int FIRST_RANGE_UPPER_LIMIT = 2;
+
+    public int calculateTotalPrice(int amount_subscriptions) {
+        if (amount_subscriptions >= FIRST_RANGE_LOWER_LIMIT && amount_subscriptions<= FIRST_RANGE_UPPER_LIMIT) return amount_subscriptions * FIRST_RANGE_UNIT_PRICE;
+        return 0;
     }
 }

exercises/tiered_pricing/solutions/oflorez/src/test/java/tv/codely/checkout/TieredPricingShould.java

@@ -2,20 +2,17 @@
 
 import org.junit.jupiter.api.Test;
 
+import java.util.stream.IntStream;
+
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static tv.codely.checkout.TieredPricing.*;
 
 public class TieredPricingShould {
 
     @Test
-	void return_total_price_299_for_1_subscription() {
+	void calculate_total_value_for_first_pricing_range() {
         var pricing = new TieredPricing();
-        assertEquals(299, pricing.calculateTotalPrice(1));
+        var subscription = IntStream.rangeClosed(FIRST_RANGE_LOWER_LIMIT, FIRST_RANGE_UPPER_LIMIT).findAny().getAsInt();
+        assertEquals(FIRST_RANGE_UNIT_PRICE * subscription, pricing.calculateTotalPrice(subscription));
 	}
-
-    @Test
-    void return_total_price_299_for_2_subscription() {
-        var pricing = new TieredPricing();
-        assertEquals(598, pricing.calculateTotalPrice(2));
-    }
-
 }