chore: testFail* deprecation warning (#9581)

* chore: testFail* deprecation warning

* test

* fix

crates/forge/src/runner.rs

@@ -402,6 +402,23 @@ impl<'a> ContractRunner<'a> {
             .collect::<BTreeMap<_, _>>();
 
         let duration = start.elapsed();
+        let test_fail_deprecations = self
+            .contract
+            .abi
+            .functions()
+            .filter_map(|func| {
+                TestFunctionKind::classify(&func.name, !func.inputs.is_empty())
+                    .is_any_test_fail()
+                    .then_some(func.name.clone())
+            })
+            .collect::<Vec<_>>()
+            .join(", ");
+
+        if !test_fail_deprecations.is_empty() {
+            warnings.push(format!(
+                "`testFail*` has been deprecated and will be removed in the next release. Consider changing to test_Revert[If|When]_Condition and expecting a revert. Found deprecated testFail* function(s): {test_fail_deprecations}.",
+            ));
+        }
         SuiteResult::new(duration, test_results, warnings)
     }
 }

crates/forge/tests/cli/test_cmd.rs

@@ -2807,3 +2807,30 @@ Ran 1 test suite [ELAPSED]: 1 tests passed, 0 failed, 0 skipped (1 total tests)
 "#]],
     );
 });
+
+forgetest!(test_fail_deprecation_warning, |prj, cmd| {
+    prj.insert_ds_test();
+
+    prj.add_source(
+        "WarnDeprecationTestFail.t.sol",
+        r#"
+    import "./test.sol";
+    contract WarnDeprecationTestFail is DSTest {
+        function testFail_deprecated() public {
+            revert("deprecated");
+        }
+
+        function testFail_deprecated2() public {
+            revert("deprecated2");
+        }
+    }
+    "#,
+    )
+    .unwrap();
+
+    cmd.forge_fuse()
+        .args(["test", "--mc", "WarnDeprecationTestFail"])
+        .assert_success()
+        .stderr_eq(r#"Warning: `testFail*` has been deprecated and will be removed in the next release. Consider changing to test_Revert[If|When]_Condition and expecting a revert. Found deprecated testFail* function(s): testFail_deprecated, testFail_deprecated2.
+"#);
+});