feat(tiered_pricing): 🟢 implementing fourth and fifth case

Author: oflorez1381

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

@@ -5,7 +5,9 @@ public enum Tier {
 
     FIRST(1,2,299),
     SECOND(3,10,239),
-    THIRD(11,25,219);
+    THIRD(11,25,219),
+    FOURTH(26,50,199),
+    FIFTH(51,Integer.MAX_VALUE,149);
 
     private final int lowerLimit;
     private final int upperLimit;

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

@@ -32,6 +32,22 @@ void calculate_total_value_for_third_pricing_tier() {
         assertEquals(calculateTotalPriceExpected(tier.getUnitPrice(), subscription), pricing.calculateTotalPrice(subscription));
     }
 
+    @Test
+    void calculate_total_value_for_fourth_pricing_tier() {
+        var pricing = new TieredPricing();
+        var tier = Tier.FOURTH;
+        var subscription = retrieveSubscriptionGivenTier(tier);
+        assertEquals(calculateTotalPriceExpected(tier.getUnitPrice(), subscription), pricing.calculateTotalPrice(subscription));
+    }
+
+    @Test
+    void calculate_total_value_for_fifth_pricing_tier() {
+        var pricing = new TieredPricing();
+        var tier = Tier.FIFTH;
+        var subscription = retrieveSubscriptionGivenTier(tier);
+        assertEquals(calculateTotalPriceExpected(tier.getUnitPrice(), subscription), pricing.calculateTotalPrice(subscription));
+    }
+
     private int retrieveSubscriptionGivenTier(Tier tier) {
         return IntStream.rangeClosed(tier.getLowerLimit(), tier.getUpperLimit()).findAny().getAsInt();
     }