Solution: GUI View Hierarchy Simulation
open class View(
val id: String,
var isVisible: Boolean
) {
fun show() {
isVisible = true
}
fun hide() {
isVisible = false
}
}
class TextView(
id: String,
var text: String
) : View(id, true)
class Toggle(
id: String,
) : View(id, true) {
var isOn: Boolean = false
fun click() {
isOn = !isOn
}
}
Example solution in playground
import junit.framework.TestCase.assertFalse
import junit.framework.TestCase.assertTrue
import org.junit.Test
import kotlin.test.assertEquals
open class View(
val id: String,
var isVisible: Boolean
) {
fun show() {
isVisible = true
}
fun hide() {
isVisible = false
}
}
class TextView(
id: String,
var text: String
) : View(id, true)
class Toggle(
id: String,
) : View(id, true) {
var isOn: Boolean = false
fun click() {
isOn = !isOn
}
}
fun main() {
val view = View(
id = "v1",
isVisible = false,
)
println(view.id) // v1
println(view.isVisible) // false
val textView = TextView(
id = "tv1",
text = "Hello, World!",
)
println(textView.id) // tv1
println(textView.text) // Hello, World!
println(textView.isVisible) // true
textView.text = "Welcome to Kotlin!"
println(textView.text) // Welcome to Kotlin!
textView.hide()
println(textView.isVisible) // false
val toggle = Toggle(
id = "toggle1",
)
println(toggle.id) // toggle1
println(toggle.isOn) // false
toggle.click()
println(toggle.isOn) // true
println(toggle.isVisible) // true
toggle.hide()
println(toggle.isVisible) // false
toggle.show()
println(toggle.isVisible) // true
}
class GuiTests {
@Test
fun `view show should set isVisible to true`() {
val view = View("view1", false)
view.show()
assertTrue(view.isVisible)
}
@Test
fun `view hide should set isVisible to false`() {
val view = View("view2", true)
view.hide()
assertFalse(view.isVisible)
}
@Test
fun `toggle click should toggle isOn state`() {
val toggle = Toggle("toggle1")
toggle.click()
assertTrue(toggle.isOn)
toggle.click()
assertFalse(toggle.isOn)
}
@Test
fun `text view setText should update text property`() {
val textView = TextView("textView1", "Hello")
textView.text = "World"
assertEquals("World", textView.text)
}
@Test
fun `toggle should inherit properties from view`() {
val toggle = Toggle("toggle2")
assertTrue(toggle.isVisible)
toggle.hide()
assertFalse(toggle.isVisible)
}
@Test
fun `text view should inherit properties from view`() {
val textView = TextView("textView2", "Hello")
assertTrue(textView.isVisible)
}
@Test
fun `toggle should start with isOn set to false`() {
val toggle = Toggle("toggle3")
assertFalse(toggle.isOn)
}
@Test
fun `toggle should toggle isOn state correctly`() {
val toggle = Toggle("toggle4")
toggle.click()
assertTrue(toggle.isOn)
toggle.click()
assertFalse(toggle.isOn)
toggle.click()
assertTrue(toggle.isOn)
}
@Test
fun `view show and hide interactions`() {
val view = View("view3", false)
view.show()
assertTrue(view.isVisible)
view.hide()
assertFalse(view.isVisible)
}
@Test
fun `text view setText and visibility interactions`() {
val textView = TextView("textView3", "Hello")
textView.text = "World"
assertEquals("World", textView.text)
textView.hide()
assertFalse(textView.isVisible)
}
}
