error: expected attribute arguments in parentheses: #[map(...)]
 --> tests/ui/invalid_mapping.rs:4:22
  |
4 | fn tested_function(#[map] _arg: &str) {
  |                      ^^^

error: unknown map transform; only `ref` is supported
 --> tests/ui/invalid_mapping.rs:9:32
  |
9 | fn other_tested_function(#[map(mut)] _arg: &str) {
  |                                ^^^

error: expected identifier
  --> tests/ui/invalid_mapping.rs:14:40
   |
14 | fn another_tested_function(#[map(ref = "String::as_str")] _arg: &str) {
   |                                        ^^^^^^^^^^^^^^^^