[Native][tests] Add a directive to specify test runner type

native/native.tests/testData/samples/regular_simple_default_tr.kt

@@ -0,0 +1,23 @@
+// TEST_RUNNER: DEFAULT
+
+import kotlin.test.*
+
+@Test
+fun addition() {
+    assertEquals(42, 40 + 2)
+}
+
+@Test
+fun multiplication () {
+    assertEquals(42, 21 * 2)
+}
+
+@Test
+fun subtraction () {
+    assertEquals(42, 50 - 8)
+}
+
+@Test
+fun division () {
+    assertEquals(42, 126 / 3)
+}