remove obsolete test (#817)

skiko/src/iosTest/kotlin/org/jetbrains/skiko/MetalRedrawerTest.kt

-package org.jetbrains.skiko
-
-import org.jetbrains.skia.Surface
-import org.jetbrains.skiko.redrawer.MetalRedrawer
-import platform.QuartzCore.CADisplayLink
-import platform.QuartzCore.CAMetalLayer
-import kotlin.native.internal.createCleaner
-import kotlin.native.ref.WeakReference
-import kotlin.test.Ignore
-import kotlin.test.Test
-import kotlin.test.assertTrue
-
-class MockNSRunLoop {
-    val displayLinks = mutableListOf<CADisplayLink>()
-}
-
-class MetalRedrawerTest {
-    @Suppress("UNUSED", "UNUSED_PARAMETER")
-    private class MetalRedrawerOwner(
-        mockNSRunLoop: MockNSRunLoop
-    ) {
-        private val redrawer: MetalRedrawer
-
-        init {
-            val weakThis = WeakReference(this)
-
-            redrawer = MetalRedrawer(
-                CAMetalLayer(),
-                drawCallback = { surface ->
-                    weakThis.get()?.draw(surface)
-                },
-                addDisplayLinkToRunLoop = {
-                    mockNSRunLoop.displayLinks.add(it)
-                },
-                disposeCallback = {
-                    assertTrue(mockNSRunLoop.displayLinks.isNotEmpty(), "mockNSRunLoop.displayLinks must contain a displayLink")
-                    assertTrue(mockNSRunLoop.displayLinks.remove(it.caDisplayLink))
-                }
-            )
-        }
-
-        @OptIn(ExperimentalStdlibApi::class)
-        private val redrawerCleaner = createCleaner(redrawer) {
-            it.dispose()
-        }
-
-        private fun draw(surface: Surface) = Unit
-    }
-
-    @Suppress("UNUSED_VARIABLE", "UNUSED")
-    private fun createAndForgetMetalRedrawerOwner(mockNSRunLoop: MockNSRunLoop) {
-        val owner = MetalRedrawerOwner(mockNSRunLoop)
-    }
-
-    @Test
-    fun `check metal redrawer is disposed`() {
-        val mockNSRunLoop = MockNSRunLoop()
-
-        createAndForgetMetalRedrawerOwner(mockNSRunLoop)
-
-        // GC can't sweep Objc-Kotlin objects in one pass due to different lifetime models
-        // Two passes do not guarantee it either, this test can break in future
-        kotlin.native.internal.GC.collect()
-        kotlin.native.internal.GC.collect()
-
-        assertTrue(mockNSRunLoop.displayLinks.isEmpty(), "displayLinks must be empty after MetalRedrawer is disposed. This test can be flaky and depends on assumptions about GC implementation.")
-    }
-}
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