himadripal commented on code in PR #7021:
URL: https://github.com/apache/arrow-rs/pull/7021#discussion_r1953830598


##########
arrow-cast/src/cast/mod.rs:
##########
@@ -9856,6 +9913,276 @@ mod tests {
         );
     }
 
+    fn run_decimal_cast_test_case_between_multiple_types(t: 
DecimalCastTestConfig) {
+        run_decimal_cast_test_case::<Decimal128Type, 
Decimal128Type>(t.clone());
+        run_decimal_cast_test_case::<Decimal128Type, 
Decimal256Type>(t.clone());
+        run_decimal_cast_test_case::<Decimal256Type, 
Decimal128Type>(t.clone());
+        run_decimal_cast_test_case::<Decimal256Type, 
Decimal256Type>(t.clone());
+    }
+
+    #[test]
+    fn test_decimal_to_decimal_coverage() {
+        let test_cases = [
+            // increase precision, increase scale, infallible
+            DecimalCastTestConfig {
+                input_prec: 5,

Review Comment:
   Can we have one test for input scale = 0 and output_scale = 0 with any 
precision.?



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