fix(fuzz): remove fuzz dir on forge clean (#7809)

crates/forge/bin/main.rs

@@ -82,6 +82,11 @@ fn main() -> Result<()> {
         ForgeSubcommand::Clean { root } => {
             let config = utils::load_config_with_root(root);
             config.project()?.cleanup()?;
+
+            // Remove fuzz cache directory.
+            if let Some(fuzz_cache) = config.fuzz.failure_persist_dir {
+                let _ = std::fs::remove_dir_all(fuzz_cache);
+            }
             Ok(())
         }
         ForgeSubcommand::Snapshot(cmd) => {

crates/forge/tests/cli/cmd.rs

@@ -2,7 +2,9 @@
 
 use crate::constants::*;
 use foundry_compilers::{artifacts::Metadata, remappings::Remapping, ConfigurableContractArtifact};
-use foundry_config::{parse_with_profile, BasicConfig, Chain, Config, SolidityErrorCode};
+use foundry_config::{
+    parse_with_profile, BasicConfig, Chain, Config, FuzzConfig, SolidityErrorCode,
+};
 use foundry_test_utils::{
     foundry_compilers::PathStyle,
     rpc::next_etherscan_api_key,
@@ -544,6 +546,20 @@ forgetest_init!(can_clean_config, |prj, cmd| {
     assert!(!artifact.exists());
 });
 
+// checks that `clean` removes fuzz cache dir
+forgetest_init!(can_clean_fuzz_cache, |prj, cmd| {
+    let config = Config { fuzz: FuzzConfig::new("cache/fuzz".into()), ..Default::default() };
+    prj.write_config(config);
+    // default test contract is written in custom out directory
+    let cache_dir = prj.root().join("cache/fuzz");
+    let _ = fs::create_dir(cache_dir.clone());
+    assert!(cache_dir.exists());
+
+    cmd.forge_fuse().arg("clean");
+    cmd.output();
+    assert!(!cache_dir.exists());
+});
+
 // checks that extra output works
 forgetest_init!(can_emit_extra_output, |prj, cmd| {
     cmd.args(["build", "--extra-output", "metadata"]);