import kotlin.test.assertEquals
import kotlin.test.assertFalse
import kotlin.test.assertTrue
import org.junit.Test

class TestFindAverageWithoutDuplicates{
    @Test
    fun noDuplicates() {
        val input = arrayOf(1, 2, 3, 4, 5)
        val expected = Pair(false, 3.0)
        val actual = findAverageWithoutDuplicates(input)
        assertEquals(expected, actual)
    }

    @Test
    fun withDuplicates() {
        val input = arrayOf(1, 2, 3, 4, 5, 5)
        val expected = Pair(true, 3.0)
        val actual = findAverageWithoutDuplicates(input)
        assertEquals(expected, actual)
    }

    @Test
    fun allDuplicates() {
        val input = arrayOf(1, 1, 1, 1, 1)
        val expected = Pair(true, 1.0)
        val actual = findAverageWithoutDuplicates(input)
        assertEquals(expected, actual)
    }

    @Test
    fun emptyInput() {
        val input = emptyArray<Int>()
        val expected = Pair(false, Double.NaN)
        val actual = findAverageWithoutDuplicates(input)
        assertEquals(expected, actual)
    }

    @Test
    fun oneNumber() {
        val input = arrayOf(1)
        val expected = Pair(false, 1.0)
        val actual = findAverageWithoutDuplicates(input)
        assertEquals(expected, actual)
    }
}