Added basic test

Fixed various bugs

src/root.zig

@@ -3,4 +3,16 @@ const std = @import("std");
 pub const SfsReader = @import("reader.zig").SfsReader;
 pub const ExtractionOptions = @import("extract_options.zig");
 
-pub const FileReader = SfsReader(std.fs.File);
+pub const SfsFile = SfsReader(std.fs.File);
+
+const test_file = "testing/LinuxPATest.sfs";
+
+test "OpenTest" {
+    const fil = try std.fs.cwd().openFile(test_file, .{});
+    defer fil.close();
+    var rdr: SfsFile = try .init(std.testing.allocator, fil, 0);
+    defer rdr.deinit();
+    std.debug.print("{}\n", .{rdr.super});
+    const root = try rdr.archiveRoot();
+    defer root.deinit();
+}