diff --git a/Cargo.lock b/Cargo.lock
index 3f397ed..7132052 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -149,6 +149,7 @@ dependencies = [
  "etrace",
  "itertools",
  "lazy_static",
+ "ntest",
  "pest",
  "pest_derive",
  "rayon",
@@ -289,6 +290,39 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "ntest"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da8ec6d2b73d45307e926f5af46809768581044384637af6b3f3fe7c3c88f512"
+dependencies = [
+ "ntest_test_cases",
+ "ntest_timeout",
+]
+
+[[package]]
+name = "ntest_test_cases"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be7d33be719c6f4d09e64e27c1ef4e73485dc4cc1f4d22201f89860a7fe22e22"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "ntest_timeout"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "066b468120587a402f0b47d8f80035c921f6a46f8209efd0632a89a16f5188a4"
+dependencies = [
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "num_cpus"
 version = "1.14.0"
@@ -355,6 +389,17 @@ dependencies = [
  "sha1",
 ]
 
+[[package]]
+name = "proc-macro-crate"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eda0fc3b0fb7c975631757e14d9049da17374063edb6ebbcbc54d880d4fe94e9"
+dependencies = [
+ "once_cell",
+ "thiserror",
+ "toml",
+]
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -440,6 +485,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
+[[package]]
+name = "serde"
+version = "1.0.149"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "256b9932320c590e707b94576e3cc1f7c9024d0ee6612dfbcf1cb106cbe8e055"
+
 [[package]]
 name = "sha1"
 version = "0.10.5"
@@ -497,6 +548,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "toml"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8d82e1a7758622a465f8cee077614c73484dac5b836c02ff6a40d5d1010324d7"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "typenum"
 version = "1.15.0"
diff --git a/src/assignments/assignment12_grade.rs b/src/assignments/assignment12_grade.rs
index decd922..ced664d 100644
--- a/src/assignments/assignment12_grade.rs
+++ b/src/assignments/assignment12_grade.rs
@@ -1,7 +1,7 @@
 #[cfg(test)]
 mod test {
-    use ntest::timeout;
     use super::super::assignment12::*;
+    use ntest::timeout;
 
     use std::sync::mpsc::channel;
     use std::thread;