Elaborate on set_to_csv and att tests

libwasmvm/src/cache.rs

@@ -273,6 +273,11 @@ impl From<cosmwasm_vm::AnalysisReport> for AnalysisReport {
     }
 }
 
+/// Takes a set of string-like elements and returns a comma-separated list.
+/// Since no escaping or quoting is applied to the elements, the caller needs to ensure
+/// only simple alphanumeric values are used.
+///
+/// The order of the output elements is determined by the iteration order of the provided set.
 fn set_to_csv(set: BTreeSet<impl AsRef<str>>) -> String {
     let list: Vec<&str> = set.iter().map(|e| e.as_ref()).collect();
     list.join(",")
@@ -772,6 +777,92 @@ mod tests {
             ])),
             "A,AA,B,C,a,aa,b,c",
         );
+
+        // str
+        assert_eq!(
+            set_to_csv(BTreeSet::from_iter(vec![
+                "a", "aa", "b", "c", "A", "AA", "B", "C",
+            ])),
+            "A,AA,B,C,a,aa,b,c",
+        );
+
+        // custom type
+        #[derive(PartialEq, Eq, Ord, Clone, Copy)]
+        enum Number {
+            One = 1,
+            Two = 2,
+            Three = 3,
+            Eleven = 11,
+            Twelve = 12,
+        }
+
+        impl AsRef<str> for Number {
+            fn as_ref(&self) -> &str {
+                use Number::*;
+                match self {
+                    One => "1",
+                    Two => "2",
+                    Three => "3",
+                    Eleven => "11",
+                    Twelve => "12",
+                }
+            }
+        }
+
+        impl PartialOrd for Number {
+            fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+                // sort by value
+                (*self as i32).partial_cmp(&(*other as i32))
+            }
+        }
+
+        assert_eq!(
+            set_to_csv(BTreeSet::from_iter([
+                Number::One,
+                Number::Two,
+                Number::Three,
+                Number::Eleven,
+                Number::Twelve,
+            ])),
+            "1,2,3,11,12",
+        );
+
+        #[derive(PartialEq, Eq, Ord)]
+        enum Color {
+            Red,
+            Green,
+            Blue,
+            Yellow,
+        }
+
+        impl AsRef<str> for Color {
+            fn as_ref(&self) -> &str {
+                use Color::*;
+                match self {
+                    Red => "red",
+                    Green => "green",
+                    Blue => "blue",
+                    Yellow => "yellow",
+                }
+            }
+        }
+
+        impl PartialOrd for Color {
+            fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+                // sort by name
+                self.as_ref().partial_cmp(other.as_ref())
+            }
+        }
+
+        assert_eq!(
+            set_to_csv(BTreeSet::from_iter([
+                Color::Red,
+                Color::Green,
+                Color::Blue,
+                Color::Yellow,
+            ])),
+            "blue,green,red,yellow",
+        );
     }
 
     #[test]