kotlin_calculator_test.kt

import junit.framework.Assert.assertEquals
import org.junit.Before
import org.junit.Test

class CalculatorTest  {

    private lateinit var calculator: Calculator

    @Before
     fun setUp() {
        calculator = Calculator()
    }

    @Test
    fun sum() {
        assertEquals(6.0, calculator.sum(1.0, 5.0))
    }

    @Test
    fun subtract() {
        assertEquals(6.0, calculator.subtract(10.0, 4.0))
    }

    @Test
    fun divide() {
        assertEquals(2.0, calculator.divide(10.0, 5.0))
    }

    @Test
    fun multiply() {
        assertEquals(20.0,calculator.multiply(2.0,10.0))
    }
}