CalculatorScreenTestV4.kt

class CalculatorScreenTest {

    @get:Rule
    val composeRule = createAndroidComposeRule(MainActivity::class.java)

    private val robot = CalculatorScreenRobot(composeRule)

    private fun arrange(block: CalculatorScreenRobot.Arrange.() -> Unit) = 
        robot.Arrange().apply(block)
    
    private fun act(block: CalculatorScreenRobot.Act.() -> Unit) =
        robot.Act().apply(block)

    private fun assert(block: CalculatorScreenRobot.Assert.() -> Unit) =
        robot.Assert().apply(block)

    @Test
    fun shouldCalculateExpressionsCorrectly() {
        // arrange
        enterFormula("((515 + 87 x 311) - 302) ÷ 27")

        // act
        performCalculation()

        // assert
        assertResultIs("1010.0")
    }
}