diff --git a/src/backend/Assembly.zig b/src/backend/Assembly.zig
index 914bffb033bfff5923a987cb6e997a23973c3155..decf8d225676b82d73cdae928d30915ffa76bbfe 100644
--- a/src/backend/Assembly.zig
+++ b/src/backend/Assembly.zig
@@ -18,3 +18,99 @@ pub fn writeToAllFile(self: Assembly, file: std.fs.File) !void {
     };
     return file.writevAll(&vec);
 }
+
+test "Assembly deinit with empty data" {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+
+    const assembly = Assembly{
+        .data = &.{},
+        .text = &.{},
+    };
+    assembly.deinit(gpa.allocator());
+}
+
+test "Assembly deinit with non-empty data" {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+
+    const data = try gpa.allocator().dupe(u8, "data section");
+    const text = try gpa.allocator().dupe(u8, ".text\n");
+    const assembly = Assembly{
+        .data = data,
+        .text = text,
+    };
+    assembly.deinit(gpa.allocator());
+}
+
+test "Assembly writeToAllFile with empty data" {
+    const tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    const file = try tmp_dir.dir.createFile("test.s", .{});
+    defer file.close();
+
+    const assembly = Assembly{
+        .data = &.{},
+        .text = &.{},
+    };
+    try assembly.writeToAllFile(file);
+    try file.seekTo(0);
+    const content = try file.readToEndAlloc(std.testing.allocator, std.math.maxInt(usize));
+    defer std.testing.allocator.free(content);
+    try std.testing.expectEqualStrings("", content);
+}
+
+test "Assembly writeToAllFile with data and text" {
+    const tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    const file = try tmp_dir.dir.createFile("test.s", .{});
+    defer file.close();
+
+    const assembly = Assembly{
+        .data = ".data\n",
+        .text = ".text\n\tret\n",
+    };
+    try assembly.writeToAllFile(file);
+    try file.seekTo(0);
+    const content = try file.readToEndAlloc(std.testing.allocator, std.math.maxInt(usize));
+    defer std.testing.allocator.free(content);
+    try std.testing.expectEqualStrings(".data\n.text\n\tret\n", content);
+}
+
+test "Assembly writeToAllFile with only data" {
+    const tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    const file = try tmp_dir.dir.createFile("test.s", .{});
+    defer file.close();
+
+    const assembly = Assembly{
+        .data = ".data\n\t.byte 0x42\n",
+        .text = &.{},
+    };
+    try assembly.writeToAllFile(file);
+    try file.seekTo(0);
+    const content = try file.readToEndAlloc(std.testing.allocator, std.math.maxInt(usize));
+    defer std.testing.allocator.free(content);
+    try std.testing.expectEqualStrings(".data\n\t.byte 0x42\n", content);
+}
+
+test "Assembly writeToAllFile with only text" {
+    const tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    const file = try tmp_dir.dir.createFile("test.s", .{});
+    defer file.close();
+
+    const assembly = Assembly{
+        .data = &.{},
+        .text = ".text\n\tmov rax, 1\n",
+    };
+    try assembly.writeToAllFile(file);
+    try file.seekTo(0);
+    const content = try file.readToEndAlloc(std.testing.allocator, std.math.maxInt(usize));
+    defer std.testing.allocator.free(content);
+    try std.testing.expectEqualStrings(".text\n\tmov rax, 1\n", content);
+}