diff --git a/course/code/12/build_system/test/src/root.zig b/course/code/12/build_system/test/src/root.zig
deleted file mode 100644
index ecfeade1..00000000
--- a/course/code/12/build_system/test/src/root.zig
+++ /dev/null
@@ -1,10 +0,0 @@
-const std = @import("std");
-const testing = std.testing;
-
-export fn add(a: i32, b: i32) i32 {
-    return a + b;
-}
-
-test "basic add functionality" {
-    try testing.expect(add(3, 7) == 10);
-}