Moved check for dir/emptiness to "handleMountPointFolder"

src/main/java/org/cryptomator/common/mount/MountWithinParentUtil.java

@@ -40,9 +40,6 @@ public final class MountWithinParentUtil {
 				}
 
 				//... (now) without hideaway
-				checkIsDirectory(mountPoint);
-				checkIsEmpty(mountPoint);
-
 				Files.move(mountPoint, hideaway);
 				if (SystemUtils.IS_OS_WINDOWS) {
 					Files.setAttribute(hideaway, WIN_HIDDEN_ATTR, true, LinkOption.NOFOLLOW_LINKS);
@@ -68,6 +65,8 @@ public final class MountWithinParentUtil {
 			return false;
 		}
 		if (!Files.readAttributes(path, BasicFileAttributes.class, LinkOption.NOFOLLOW_LINKS).isOther()) {
+			checkIsDirectory(path);
+			checkIsEmpty(path);
 			return true;
 		}
 		if (Files.exists(path /* FOLLOW_LINKS */)) { //Both junction and target exist

src/test/java/org/cryptomator/common/mount/MountWithinParentUtilTest.java

@@ -89,27 +89,27 @@ class MountWithinParentUtilTest {
 	void testPrepareBothExistMountNotDir(@TempDir Path parentDir) throws IOException {
 		var mount = parentDir.resolve("mount");
 		var hideaway = getHideaway(mount);
-		Files.createDirectory(hideaway);
+		Files.createFile(hideaway);
 		Files.createFile(mount);
 
 		assertThrows(MountPointNotEmptyDirectoryException.class, () -> {
-			prepareParentNoMountPoint(mount);
+			prepareParentNoMountPoint(mount); //Must not throw something related to hideaway
 		});
-		assertTrue(Files.notExists(hideaway, NOFOLLOW_LINKS));
+		assertTrue(Files.exists(hideaway, NOFOLLOW_LINKS));
 	}
 
 	@Test
 	void testPrepareBothExistMountNotEmpty(@TempDir Path parentDir) throws IOException {
 		var mount = parentDir.resolve("mount");
 		var hideaway = getHideaway(mount);
-		Files.createDirectory(hideaway);
+		Files.createFile(hideaway);
 		Files.createDirectory(mount);
 		Files.createFile(mount.resolve("dummy"));
 
 		assertThrows(MountPointNotEmptyDirectoryException.class, () -> {
-			prepareParentNoMountPoint(mount);
+			prepareParentNoMountPoint(mount); //Must not throw something related to hideaway
 		});
-		assertTrue(Files.notExists(hideaway, NOFOLLOW_LINKS));
+		assertTrue(Files.exists(hideaway, NOFOLLOW_LINKS));
 	}
 
 	@Test