diff --git a/dev/Cargo.toml b/dev/Cargo.toml
index 4f725b70..1d22b171 100644
--- a/dev/Cargo.toml
+++ b/dev/Cargo.toml
@@ -140,6 +140,8 @@ bin = [
   { name = "tests2_sol", path = "../solutions/17_tests/tests2.rs" },
   { name = "tests3", path = "../exercises/17_tests/tests3.rs" },
   { name = "tests3_sol", path = "../solutions/17_tests/tests3.rs" },
+  { name = "tests4", path = "../exercises/17_tests/tests4.rs" },
+  { name = "tests4_sol", path = "../solutions/17_tests/tests4.rs" },
   { name = "iterators1", path = "../exercises/18_iterators/iterators1.rs" },
   { name = "iterators1_sol", path = "../solutions/18_iterators/iterators1.rs" },
   { name = "iterators2", path = "../exercises/18_iterators/iterators2.rs" },
diff --git a/exercises/17_tests/tests4.rs b/exercises/17_tests/tests4.rs
index ef5fd7e6..bcd75d54 100644
--- a/exercises/17_tests/tests4.rs
+++ b/exercises/17_tests/tests4.rs
@@ -2,7 +2,7 @@ fn main() {}
 
 #[cfg(test)]
 mod tests {
-    //TODO make sure this test does not run 
+    // TODO make sure this test does not run
     #[test]
     fn ignore_test() {
         // Do not change this line