diff --git a/src/builder.rs b/src/builder.rs
index 41dfd37..b189d50 100644
--- a/src/builder.rs
+++ b/src/builder.rs
@@ -169,7 +169,6 @@ impl Compressor {
                 gain *= 8;
             }
             if gain > 0 {
-                // println!("pushing single: symbol = {symbol1:?} gain = {gain}");
                 pqueue.push(Candidate {
                     symbol: symbol1,
                     gain,
@@ -186,13 +185,6 @@ impl Compressor {
                 let new_symbol = symbol1.concat(symbol2);
                 let gain = counters.count2(code1, code2) * new_symbol.len();
                 if gain > 0 {
-                    // println!("pushing double: symbol = {new_symbol:?} gain = {gain}");
-                    // println!(
-                    //     "\tfirst-half gain = {} second-half gain = {}",
-                    //     counters.count1(code1),
-                    //     counters.count1(code2)
-                    // );
-
                     pqueue.push(Candidate {
                         symbol: new_symbol,
                         gain,
@@ -272,13 +264,8 @@ impl Ord for Candidate {
 
 #[cfg(test)]
 mod test {
-    use crate::{Compressor, ESCAPE_CODE};
 
-    #[test]
-    fn test_sadness() {
-        let compressor = Compressor::train_n("hello world", 1);
-        let _ = compressor.compress(&[1]);
-    }
+    use crate::{Compressor, ESCAPE_CODE};
 
     #[test]
     fn test_builder() {
diff --git a/tests/correctness.rs b/tests/correctness.rs
index d557f06..5a68cb1 100644
--- a/tests/correctness.rs
+++ b/tests/correctness.rs
@@ -59,22 +59,17 @@ fn test_zeros() {
 
 #[test]
 fn test_large() {
-    let mut corpus = String::new();
-    // TODO(aduffy): make this larger once table build performance is better.
-    while corpus.len() < 10 * 1_024 {
-        corpus.push_str(DECLARATION);
-    }
+    let corpus: Vec<u8> = DECLARATION.bytes().cycle().take(10_240).collect();
 
     let trained = Compressor::train(&corpus);
-    let mut massive = String::new();
-    while massive.len() < 16 * 1_024 * 1_024 {
-        massive.push_str(DECLARATION);
-    }
-    let compressed = trained.compress(massive.as_bytes());
-    assert_eq!(
-        trained.decompressor().decompress(&compressed),
-        massive.as_bytes()
-    );
+    let massive: Vec<u8> = DECLARATION
+        .bytes()
+        .cycle()
+        .take(16 * 1_024 * 1_024)
+        .collect();
+
+    let compressed = trained.compress(&massive);
+    assert_eq!(trained.decompressor().decompress(&compressed), massive);
 }
 
 #[test]