Updated doc, removed some checks from the atomicMoveDir test

Author: fzhinkin

core/common/src/files/FileSystem.kt

@@ -65,6 +65,9 @@ public sealed interface FileSystem {
      * filesystems (or different volumes, on Windows) and the operation could not be performed atomically,
      * [UnsupportedOperationException] is thrown.
      *
+     * When [destination] is an existing directory, the operation may fail on some platforms
+     * (on Windows, particularly).
+     *
      * @param source the path to rename.
      * @param destination desired path name.
      *

core/common/test/files/SmokeFileTest.kt

@@ -117,21 +117,6 @@ class SmokeFileTest {
         FileSystem.System.atomicMove(src, dst)
         assertFalse(FileSystem.System.exists(src))
         assertTrue(FileSystem.System.exists(dst))
-
-        val src2 = createTempPath()
-        FileSystem.System.createDirectories(src2)
-        FileSystem.System.atomicMove(src2, dst)
-        assertFalse(FileSystem.System.exists(src2))
-
-        val src3 = createTempPath()
-        FileSystem.System.sink(src3).buffered().use { it.writeString("hehe") }
-        assertFailsWith<IOException> { FileSystem.System.atomicMove(src3, dst) }
-
-        val dstFile = createTempPath()
-        FileSystem.System.sink(dstFile).buffered().use { it.writeString("hehe") }
-        val srcDir = createTempPath()
-        FileSystem.System.createDirectories(srcDir)
-        assertFailsWith<IOException> { FileSystem.System.atomicMove(srcDir, dstFile) }
     }
 
     @Test