BAEL-1758: Working with Enums in Kotlin (#4413)

core-kotlin/src/main/kotlin/com/baeldung/enums/CardType.kt

@@ -0,0 +1,33 @@
+package com.baeldung.enums
+
+enum class CardType(val color: String) : ICardLimit {
+    SILVER("gray") {
+        override fun getCreditLimit(): Int {
+            return 100000
+        }
+
+        override fun calculateCashbackPercent(): Float {
+            return 0.25f
+        }
+    },
+    GOLD("yellow") {
+        override fun getCreditLimit(): Int {
+            return 200000
+        }
+
+        override fun calculateCashbackPercent(): Float {
+            return 0.5f
+        }
+    },
+    PLATINUM("black") {
+        override fun getCreditLimit(): Int {
+            return 300000
+        }
+
+        override fun calculateCashbackPercent(): Float {
+            return 0.75f
+        }
+    };
+
+    abstract fun calculateCashbackPercent(): Float
+}

core-kotlin/src/main/kotlin/com/baeldung/enums/CardTypeHelper.kt

@@ -0,0 +1,16 @@
+package com.baeldung.enums
+
+class CardTypeHelper {
+    fun getCardTypeByColor(color: String): CardType? {
+        for (cardType in CardType.values()) {
+            if (cardType.color.equals(color)) {
+                return cardType;
+            }
+        }
+        return null
+    }
+
+    fun getCardTypeByName(name: String): CardType {
+        return CardType.valueOf(name.toUpperCase())
+    }
+}

core-kotlin/src/main/kotlin/com/baeldung/enums/ICardLimit.kt

@@ -0,0 +1,5 @@
+package com.baeldung.enums
+
+interface ICardLimit {
+    fun getCreditLimit(): Int
+}

core-kotlin/src/test/kotlin/com/baeldung/enums/CardTypeHelperUnitTest.kt

@@ -0,0 +1,43 @@
+package com.baeldung.enums
+
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Test
+
+internal class CardTypeHelperUnitTest {
+
+    @Test
+    fun whenGetCardTypeByColor_thenSilverCardType() {
+        val cardTypeHelper = CardTypeHelper()
+        Assertions.assertEquals(CardType.SILVER, cardTypeHelper.getCardTypeByColor("gray"))
+    }
+
+    @Test
+    fun whenGetCardTypeByColor_thenGoldCardType() {
+        val cardTypeHelper = CardTypeHelper()
+        Assertions.assertEquals(CardType.GOLD, cardTypeHelper.getCardTypeByColor("yellow"))
+    }
+
+    @Test
+    fun whenGetCardTypeByColor_thenPlatinumCardType() {
+        val cardTypeHelper = CardTypeHelper()
+        Assertions.assertEquals(CardType.PLATINUM, cardTypeHelper.getCardTypeByColor("black"))
+    }
+
+    @Test
+    fun whenGetCardTypeByName_thenSilverCardType() {
+        val cardTypeHelper = CardTypeHelper()
+        Assertions.assertEquals(CardType.SILVER, cardTypeHelper.getCardTypeByName("silver"))
+    }
+
+    @Test
+    fun whenGetCardTypeByName_thenGoldCardType() {
+        val cardTypeHelper = CardTypeHelper()
+        Assertions.assertEquals(CardType.GOLD, cardTypeHelper.getCardTypeByName("gold"))
+    }
+
+    @Test
+    fun whenGetCardTypeByName_thenPlatinumCardType() {
+        val cardTypeHelper = CardTypeHelper()
+        Assertions.assertEquals(CardType.PLATINUM, cardTypeHelper.getCardTypeByName("platinum"))
+    }
+}

core-kotlin/src/test/kotlin/com/baeldung/enums/CardTypeUnitTest.kt

@@ -0,0 +1,52 @@
+package com.baeldung.enums
+
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+
+internal class CardTypeUnitTest {
+
+    @Test
+    fun givenSilverCardType_whenCalculateCashbackPercent_thenReturnCashbackValue() {
+        assertEquals(0.25f, CardType.SILVER.calculateCashbackPercent())
+    }
+
+    @Test
+    fun givenGoldCardType_whenCalculateCashbackPercent_thenReturnCashbackValue() {
+        assertEquals(0.5f, CardType.GOLD.calculateCashbackPercent())
+    }
+
+    @Test
+    fun givenPlatinumCardType_whenCalculateCashbackPercent_thenReturnCashbackValue() {
+        assertEquals(0.75f, CardType.PLATINUM.calculateCashbackPercent())
+    }
+
+    @Test
+    fun givenSilverCardType_whenGetCreditLimit_thenReturnCreditLimit() {
+        assertEquals(100000, CardType.SILVER.getCreditLimit())
+    }
+
+    @Test
+    fun givenGoldCardType_whenGetCreditLimit_thenReturnCreditLimit() {
+        assertEquals(200000, CardType.GOLD.getCreditLimit())
+    }
+
+    @Test
+    fun givenPlatinumCardType_whenGetCreditLimit_thenReturnCreditLimit() {
+        assertEquals(300000, CardType.PLATINUM.getCreditLimit())
+    }
+
+    @Test
+    fun givenSilverCardType_whenCheckColor_thenReturnColor() {
+        assertEquals("gray", CardType.SILVER.color)
+    }
+
+    @Test
+    fun givenGoldCardType_whenCheckColor_thenReturnColor() {
+        assertEquals("yellow", CardType.GOLD.color)
+    }
+
+    @Test
+    fun givenPlatinumCardType_whenCheckColor_thenReturnColor() {
+        assertEquals("black", CardType.PLATINUM.color)
+    }
+}