Add test source junit 5 and updated the exception

build.gradle.kts

@@ -11,4 +11,5 @@ repositories {
 
 dependencies {
     implementation(kotlin("stdlib"))
+    testImplementation("org.junit.vintage:junit-vintage-engine:5.6.2")
 }

src/main/kotlin/com/cubetiqs/libra/moneyutils/Main.kt

@@ -1,13 +0,0 @@
-package com.cubetiqs.libra.moneyutils
-
-class Main {
-    fun run() = print("Just mind!")
-}
-
-fun main() {
-    Main().run()
-    val money = Money(10.0)
-    val money2 = Money(20.0)
-    money *= money
-    println((money + money2) * money2)
-}

src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyCurrencyStateException.kt

@@ -1,3 +1,7 @@
 package com.cubetiqs.libra.moneyutils
 
-class MoneyCurrencyStateException(message: String? = null) : IllegalStateException(message ?: "money currency not found!")
+/**
+ * Default money currency state exception
+ */
+class MoneyCurrencyStateException(message: String? = null) :
+    IllegalStateException(message ?: "money currency is illegal state!")

src/test/kotlin/MoneyTests.kt

@@ -0,0 +1,17 @@
+import com.cubetiqs.libra.moneyutils.Money
+import com.cubetiqs.libra.moneyutils.plus
+import com.cubetiqs.libra.moneyutils.times
+import com.cubetiqs.libra.moneyutils.timesAssign
+import org.junit.Assert
+import org.junit.Test
+
+class MoneyTests {
+    @Test
+    fun test() {
+        val money = Money(10.0)
+        val money2 = Money(20.0)
+        money *= money
+        println((money + money2) * money2)
+        Assert.assertEquals(10, 10)
+    }
+}