diff --git a/helix-core/src/auto_pairs.rs b/helix-core/src/auto_pairs.rs
index 9d1152bcd..408026803 100644
--- a/helix-core/src/auto_pairs.rs
+++ b/helix-core/src/auto_pairs.rs
@@ -322,7 +322,7 @@ mod test {
     use super::*;
     use smallvec::smallvec;
 
-    const LINE_END: &'static str = crate::DEFAULT_LINE_ENDING.as_str();
+    const LINE_END: &str = crate::DEFAULT_LINE_ENDING.as_str();
 
     fn differing_pairs() -> impl Iterator<Item = &'static (char, char)> {
         PAIRS.iter().filter(|(open, close)| open != close)
@@ -339,7 +339,7 @@ mod test {
         expected_doc: &Rope,
         expected_sel: &Selection,
     ) {
-        let trans = hook(&in_doc, &in_sel, ch).unwrap();
+        let trans = hook(in_doc, in_sel, ch).unwrap();
         let mut actual_doc = in_doc.clone();
         assert!(trans.apply(&mut actual_doc));
         assert_eq!(expected_doc, &actual_doc);
diff --git a/helix-core/src/chars.rs b/helix-core/src/chars.rs
index c8e5efbde..549915740 100644
--- a/helix-core/src/chars.rs
+++ b/helix-core/src/chars.rs
@@ -91,12 +91,11 @@ mod test {
 
     #[test]
     fn test_categorize() {
-        const EOL_TEST_CASE: &'static str = "\n\r\u{000B}\u{000C}\u{0085}\u{2028}\u{2029}";
-        const WORD_TEST_CASE: &'static str =
-            "_hello_world_あいうえおー1234567890１２３４５６７８９０";
-        const PUNCTUATION_TEST_CASE: &'static str =
+        const EOL_TEST_CASE: &str = "\n\r\u{000B}\u{000C}\u{0085}\u{2028}\u{2029}";
+        const WORD_TEST_CASE: &str = "_hello_world_あいうえおー1234567890１２３４５６７８９０";
+        const PUNCTUATION_TEST_CASE: &str =
             "!\"#$%&\'()*+,-./:;<=>?@[\\]^`{|}~！”＃＄％＆’（）＊＋、。：；＜＝＞？＠「」＾｀｛｜｝～";
-        const WHITESPACE_TEST_CASE: &'static str = "  　   ";
+        const WHITESPACE_TEST_CASE: &str = "  　   ";
 
         for ch in EOL_TEST_CASE.chars() {
             assert_eq!(CharCategory::Eol, categorize_char(ch));
diff --git a/helix-core/src/diff.rs b/helix-core/src/diff.rs
index 3349213d7..6960c679c 100644
--- a/helix-core/src/diff.rs
+++ b/helix-core/src/diff.rs
@@ -58,7 +58,7 @@ mod tests {
             let mut old = Rope::from(a);
             let new = Rope::from(b);
             compare_ropes(&old, &new).apply(&mut old);
-            old.to_string() == new.to_string()
+            old == new
         }
     }
 }
diff --git a/helix-core/src/history.rs b/helix-core/src/history.rs
index 4b1c8d3b3..bb95213c1 100644
--- a/helix-core/src/history.rs
+++ b/helix-core/src/history.rs
@@ -448,8 +448,8 @@ mod test {
             change: crate::transaction::Change,
             instant: Instant,
         ) {
-            let txn = Transaction::change(&state.doc, vec![change.clone()].into_iter());
-            history.commit_revision_at_timestamp(&txn, &state, instant);
+            let txn = Transaction::change(&state.doc, vec![change].into_iter());
+            history.commit_revision_at_timestamp(&txn, state, instant);
             txn.apply(&mut state.doc);
         }
 
diff --git a/helix-core/src/indent.rs b/helix-core/src/indent.rs
index ac2a12082..a8ea30124 100644
--- a/helix-core/src/indent.rs
+++ b/helix-core/src/indent.rs
@@ -416,7 +416,7 @@ where
 ",
         );
 
-        let doc = Rope::from(doc);
+        let doc = doc;
         use crate::diagnostic::Severity;
         use crate::syntax::{
             Configuration, IndentationConfiguration, LanguageConfiguration, Loader,
@@ -454,7 +454,7 @@ where
 
         let language_config = loader.language_config_for_scope("source.rust").unwrap();
         let highlight_config = language_config.highlight_config(&[]).unwrap();
-        let syntax = Syntax::new(&doc, highlight_config.clone(), std::sync::Arc::new(loader));
+        let syntax = Syntax::new(&doc, highlight_config, std::sync::Arc::new(loader));
         let text = doc.slice(..);
         let tab_width = 4;
 
diff --git a/helix-core/src/line_ending.rs b/helix-core/src/line_ending.rs
index 3541305c3..8eb426e1e 100644
--- a/helix-core/src/line_ending.rs
+++ b/helix-core/src/line_ending.rs
@@ -250,7 +250,7 @@ mod line_ending_tests {
         assert_eq!(get_line_ending_of_str(&text[..6]), Some(LineEnding::CR));
         assert_eq!(get_line_ending_of_str(&text[..12]), Some(LineEnding::LF));
         assert_eq!(get_line_ending_of_str(&text[..17]), Some(LineEnding::Crlf));
-        assert_eq!(get_line_ending_of_str(&text[..]), None);
+        assert_eq!(get_line_ending_of_str(text), None);
     }
 
     #[test]
diff --git a/helix-core/src/selection.rs b/helix-core/src/selection.rs
index 1515c4fc3..c6eceb4b5 100644
--- a/helix-core/src/selection.rs
+++ b/helix-core/src/selection.rs
@@ -766,16 +766,16 @@ mod test {
     fn test_contains() {
         let range = Range::new(10, 12);
 
-        assert_eq!(range.contains(9), false);
-        assert_eq!(range.contains(10), true);
-        assert_eq!(range.contains(11), true);
-        assert_eq!(range.contains(12), false);
-        assert_eq!(range.contains(13), false);
+        assert!(!range.contains(9));
+        assert!(range.contains(10));
+        assert!(range.contains(11));
+        assert!(!range.contains(12));
+        assert!(!range.contains(13));
 
         let range = Range::new(9, 6);
-        assert_eq!(range.contains(9), false);
-        assert_eq!(range.contains(7), true);
-        assert_eq!(range.contains(6), true);
+        assert!(!range.contains(9));
+        assert!(range.contains(7));
+        assert!(range.contains(6));
     }
 
     #[test]
diff --git a/helix-core/src/surround.rs b/helix-core/src/surround.rs
index b53b0a78c..58eb23cf2 100644
--- a/helix-core/src/surround.rs
+++ b/helix-core/src/surround.rs
@@ -172,6 +172,7 @@ mod test {
     use ropey::Rope;
     use smallvec::SmallVec;
 
+    #[allow(clippy::type_complexity)]
     fn check_find_nth_pair_pos(
         text: &str,
         cases: Vec<(usize, char, usize, Option<(usize, usize)>)>,
diff --git a/helix-core/src/transaction.rs b/helix-core/src/transaction.rs
index d8d389f3b..30995e8ce 100644
--- a/helix-core/src/transaction.rs
+++ b/helix-core/src/transaction.rs
@@ -761,7 +761,7 @@ mod test {
 
     #[test]
     fn combine_with_utf8() {
-        const TEST_CASE: &'static str = "Hello, これはヘリックスエディターです！";
+        const TEST_CASE: &str = "Hello, これはヘリックスエディターです！";
 
         let empty = Rope::from("");
         let a = ChangeSet::new(&empty);
diff --git a/helix-tui/src/widgets/reflow.rs b/helix-tui/src/widgets/reflow.rs
index 21847783b..33e52bb4e 100644
--- a/helix-tui/src/widgets/reflow.rs
+++ b/helix-tui/src/widgets/reflow.rs
@@ -404,8 +404,8 @@ mod test {
         let text = "コンピュータ上で文字を扱う場合、典型的には文字による通信を行う場合にその両端点\
                     では、";
         let (word_wrapper, word_wrapper_width) =
-            run_composer(Composer::WordWrapper { trim: true }, &text, width);
-        let (line_truncator, _) = run_composer(Composer::LineTruncator, &text, width);
+            run_composer(Composer::WordWrapper { trim: true }, text, width);
+        let (line_truncator, _) = run_composer(Composer::LineTruncator, text, width);
         assert_eq!(line_truncator, vec!["コンピュータ上で文字"]);
         let wrapped = vec![
             "コンピュータ上で文字",
diff --git a/helix-view/src/view.rs b/helix-view/src/view.rs
index 89a6c196b..adfcd0712 100644
--- a/helix-view/src/view.rs
+++ b/helix-view/src/view.rs
@@ -356,7 +356,7 @@ mod tests {
         let text = rope.slice(..);
 
         assert_eq!(
-            view.text_pos_at_screen_coords(&text, 40, 40 + OFFSET + 0, 4),
+            view.text_pos_at_screen_coords(&text, 40, 40 + OFFSET, 4),
             Some(0)
         );
 
@@ -389,7 +389,7 @@ mod tests {
         let text = rope.slice(..);
 
         assert_eq!(
-            view.text_pos_at_screen_coords(&text, 40, 40 + OFFSET + 0, 4),
+            view.text_pos_at_screen_coords(&text, 40, 40 + OFFSET, 4),
             Some(0)
         );