Fix clippy lints (#2651)

crates/nu-cli/tests/commands/keep/rows.rs

@@ -0,0 +1,32 @@
+use nu_test_support::fs::Stub::FileWithContentToBeTrimmed;
+use nu_test_support::playground::Playground;
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn rows() {
+    Playground::setup("keep_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "caballeros.csv",
+            r#"
+                name,lucky_code
+                Andrés,1
+                Jonathan,1
+                Jason,2
+                Yehuda,1
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open caballeros.csv
+                | keep 3
+                | get lucky_code
+                | math sum
+                | echo $it
+                "#
+        ));
+
+        assert_eq!(actual.out, "4");
+    })
+}