Ios test with resource (#302)

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

+package org.jetbrains.skiko
+
+import kotlinx.cinterop.addressOf
+import kotlinx.cinterop.toKString
+import kotlinx.cinterop.usePinned
+import platform.Foundation.NSBundle
+import platform.posix.*
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+fun resourcePath(): String {
+    val kexeDir = NSBundle.mainBundle.bundlePath
+    // Binary currently compiled into `build/bin/iosX64/debugTest`.
+    return "$kexeDir/../../../../src/iosTest/resources"
+}
+
+class BasicIosTests {
+    @Test
+    fun resourceAccess() {
+        val path = "${resourcePath()}/data.txt"
+        val f = fopen(path, "r") ?: throw Error("cannot open $path: ${strerror(errno)?.toKString()}")
+        val buf = ByteArray(200)
+        buf.usePinned {
+            val rv = fread(it.addressOf(0), 1, buf.size.toULong(), f)
+            assertTrue { rv != 0UL }
+        }
+        assertEquals("This is test data.\n", buf.toKString())
+        fclose(f)
+    }
+}

skiko/src/iosTest/resources/data.txt

+This is test data.