buraksenn commented on code in PR #14307:
URL: https://github.com/apache/datafusion/pull/14307#discussion_r1931292619


##########
datafusion/functions/src/math/monotonicity.rs:
##########
@@ -558,3 +558,441 @@ pub fn get_tanh_doc() -> &'static Documentation {
         .build()
     })
 }
+
+#[cfg(test)]
+mod tests {
+    use arrow::compute::SortOptions;
+    use datafusion_common::Result;
+
+    use super::*;
+
+    #[derive(Debug)]
+    struct MonotonicityTestCase {
+        name: &'static str,
+        func: fn(&[ExprProperties]) -> Result<SortProperties>,
+        lower: f64,
+        upper: f64,
+        input_sort: SortProperties,
+        expected: Option<SortProperties>,
+        expect_err: bool,

Review Comment:
   Oh, I got it now. I needed to `strip_backtrace()` before comparing errors. I 
think I've fixed it now



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