I'll try the enum later

pom.xml

@@ -2,13 +2,33 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
+    <modelVersion>4.12</modelVersion>
 
     <groupId>io.zipcoder</groupId>
     <artifactId>wu-tang-financial</artifactId>
     <version>1.0-SNAPSHOT</version>
 
     <dependencies>
 
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>4.12</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>4.12</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>RELEASE</version>
+        </dependency>
     </dependencies>
 </project>

src/main/java/ExchangeRate.java

@@ -0,0 +1,24 @@
+import java.text.DecimalFormat;
+
+public class ExchangeRate {
+
+    static double USD = 1.00;
+    static double EUR = 0.94; //Euro
+    static double GBP = 0.82; //British Pound
+    static double INR = 68.32; //Indian Rupee
+    static double AUD = 1.35; //Austrailian Dollar
+    static double CAD = 1.32; //Canadian Dollar
+    static double SGD = 1.43; //Singapore Dollar
+    static double CHF = 1.01; //Swiss Franc
+    static double MYR = 4.47; //Malaysian Ringgit
+    static double JPY = 115.84; //Japanese Yen
+    static double CNY = 6.92; //Chinese Yuan Renminbi
+
+    public static double convert(double InitialAmount, double initialCurrency, double targetCurrency) {
+        //Amount will be standardized at USD
+        double converted = (InitialAmount/initialCurrency) * targetCurrency;
+        DecimalFormat rounded = new DecimalFormat("#.00");
+        return Double.parseDouble(rounded.format(converted));
+    }
+
+}

src/test/java/ExchangeTest.java

@@ -0,0 +1,84 @@
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.Assert;
+
+public class ExchangeTest {
+
+    public double initialAmount;
+
+    @Before
+    public void amountInitializer() {
+        initialAmount = 1.00; //USD
+    }
+
+    @Test
+    public void dollarToEuro() {
+        double expected = 0.94;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.USD, ExchangeRate.EUR);
+        Assert.assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void euroToDollar() {
+        double expected = 1.06;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.EUR, ExchangeRate.USD);
+        Assert.assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void euroToPound() {
+        double expected = 0.87;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.EUR, ExchangeRate.GBP);
+        Assert.assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void poundToRupee() {
+        double expected = 83.32;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.GBP, ExchangeRate.INR);
+        Assert.assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void rupeeToCanadianDollar() {
+        double expected = 0.02;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.INR, ExchangeRate.CAD);
+        Assert.assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void canadianDollarToSingaporeDollar() {
+        double expected = 1.08;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.CAD, ExchangeRate.SGD);
+        Assert.assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void singaporeDollarToFranc() {
+        double expected = 0.71;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.SGD, ExchangeRate.CHF);
+        Assert.assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void francToRinggit() {
+        double expected = 4.43;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.CHF, ExchangeRate.MYR);
+        Assert.assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void ringgitToYen() {
+        double expected = 1.55;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.MYR, ExchangeRate.CNY);
+        Assert.assertEquals(expected, actual, 0.001);
+
+    }
+
+    @Test
+    public void yenToRenminbi() {
+        double expected = 0.06;
+        double actual = ExchangeRate.convert(initialAmount, ExchangeRate.JPY, ExchangeRate.CNY);
+        Assert.assertEquals(expected, actual, 0.001);
+    }
+}