diff --git a/kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/junit5/Calculator.kt b/kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/junit5/Calculator.kt
new file mode 100644
index 0000000000..1b61c05887
--- /dev/null
+++ b/kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/junit5/Calculator.kt
@@ -0,0 +1,17 @@
+package com.baeldung.kotlin.junit5
+
+class Calculator {
+    fun add(a: Int, b: Int) = a + b
+
+    fun divide(a: Int, b: Int) = if (b == 0) {
+        throw DivideByZeroException(a)
+    } else {
+        a / b
+    }
+
+    fun square(a: Int) = a * a
+
+    fun squareRoot(a: Int) = Math.sqrt(a.toDouble())
+
+    fun log(base: Int, value: Int) = Math.log(value.toDouble()) / Math.log(base.toDouble())
+}
diff --git a/kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/junit5/DivideByZeroException.kt b/kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/junit5/DivideByZeroException.kt
new file mode 100644
index 0000000000..60bc4e2944
--- /dev/null
+++ b/kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/junit5/DivideByZeroException.kt
@@ -0,0 +1,3 @@
+package com.baeldung.kotlin.junit5
+
+class DivideByZeroException(val numerator: Int) : Exception()