diff --git a/core/src/fibbonacci.rs b/core/src/fibbonacci.rs
index a787b69..0086937 100644
--- a/core/src/fibbonacci.rs
+++ b/core/src/fibbonacci.rs
@@ -4,8 +4,8 @@ pub fn fibbonacci(index: usize) -> usize {
     } else if index < 3 {
         1
     } else {
-        let mut values = vec![1;index+1];
-        for i in 3..index+1 {
+        let mut values = vec![1; index + 1];
+        for i in 3..index + 1 {
             values[i] = values[i - 1] + values[i - 2];
         }
         values[index]
@@ -18,7 +18,7 @@ mod tests {
 
     #[test]
     fn test_first_few_values() {
-        let expected_values = vec![
+        let expected_values = [
             0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181,
             6765, 10946,
         ];
diff --git a/core/src/rope/mod.rs b/core/src/rope/mod.rs
index 9c69e96..10d6b12 100644
--- a/core/src/rope/mod.rs
+++ b/core/src/rope/mod.rs
@@ -1,5 +1,5 @@
 use super::fibbonacci::fibbonacci;
-pub use std::rc::Rc;
+use std::rc::Rc;
 
 /// [Rope](https://en.wikipedia.org/wiki/Rope_(data_structure)) data structure
 /// implementation.
diff --git a/core/src/rope/tests/command_list.rs b/core/src/rope/tests/command_list.rs
index bc7b2e1..09d9d92 100644
--- a/core/src/rope/tests/command_list.rs
+++ b/core/src/rope/tests/command_list.rs
@@ -45,12 +45,12 @@ pub fn generate_random_edit_sequence_with_seed(
     seed: u64,
 ) -> (String, Vec<(Command, String)>) {
     let mut rng = SmallRng::seed_from_u64(seed);
-    let start_text_length = rng.random_range(0..4000);
+    let start_text_length = rng.random_range(0..length);
     let start_text = Alphanumeric.sample_string(&mut rng, start_text_length);
     let num_steps = rng.random_range(0..1000);
     let mut steps = Vec::with_capacity(num_steps);
     let mut current_text = start_text.clone();
-    for i in 0..num_steps {
+    for _ in 0..num_steps {
         let current_text_length = current_text.len();
         let command = if rng.random_bool(0.7) || current_text_length > 0 {
             let index = rng.random_range(0..current_text_length);