passed all tests

src/main/java/io/zipcoder/currencyconverterapplication/ConvertableCurrency.java

@@ -1,7 +1,10 @@
 package io.zipcoder.currencyconverterapplication;
 
 public interface ConvertableCurrency {
+
     default Double convert(CurrencyType currencyType) {
-        return Double.MAX_VALUE;
+        return currencyType.getRate() / this.getRate();
     }
+
+    Double getRate();
 }

src/main/java/io/zipcoder/currencyconverterapplication/CurrencyType.java

@@ -25,6 +25,42 @@ public Double getRate() {
     }
 
     public static CurrencyType getTypeOfCurrency(ConvertableCurrency currency) {
+        if (currency.getRate() == AUSTRALIAN_DOLLAR.rate) {
+            return AUSTRALIAN_DOLLAR;
+        }
+        else if (currency.getRate() == CANADIAN_DOLLAR.rate) {
+            return CANADIAN_DOLLAR;
+        }
+        else if (currency.getRate() == CHINESE_YR.rate) {
+            return CHINESE_YR;
+        }
+        else if (currency.getRate() == EURO.rate) {
+            return EURO;
+        }
+        else if (currency.getRate() == FRANC.rate) {
+            return FRANC;
+        }
+        else if (currency.getRate() == POUND.rate) {
+            return POUND;
+        }
+        else if (currency.getRate() == RINGGIT.rate) {
+            return RINGGIT;
+        }
+        else if (currency.getRate() == RUPEE.rate) {
+            return RUPEE;
+        }
+        else if (currency.getRate() == SINGAPORE_DOLLAR.rate) {
+            return SINGAPORE_DOLLAR;
+        }
+        else if (currency.getRate() == US_DOLLAR.rate) {
+            return US_DOLLAR;
+        }
+        else if (currency.getRate() == UNIVERSAL_CURRENCY.rate) {
+            return UNIVERSAL_CURRENCY;
+        }
+        else if (currency.getRate() == YEN.rate) {
+            return YEN;
+        }
         return null;
     }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/AustralianDollar.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class AustralianDollar implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.AUSTRALIAN_DOLLAR.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/CanadianDollar.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class CanadianDollar implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.CANADIAN_DOLLAR.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/ChineseYR.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class ChineseYR implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.CHINESE_YR.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Euro.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Euro implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.EURO.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Franc.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Franc implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.FRANC.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Pound.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Pound implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.POUND.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Ringgit.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Ringgit implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.RINGGIT.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Rupee.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Rupee implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.RUPEE.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/SingaporeDollar.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class SingaporeDollar implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.SINGAPORE_DOLLAR.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/USDollar.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class USDollar implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.US_DOLLAR.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/UniversalCurrency.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class UniversalCurrency implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.UNIVERSAL_CURRENCY.getRate();
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Yen.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Yen implements ConvertableCurrency {
+    @Override
+    public Double getRate() {
+        return CurrencyType.YEN.getRate();
+    }
 }