fix(fuzz) - consistent gas snapshot between runs

Author: grandizzy

crates/forge/bin/cmd/snapshot.rs

@@ -94,8 +94,9 @@ impl SnapshotArgs {
     }
 
     pub async fn run(mut self) -> Result<()> {
-        // Set fuzz seed so gas snapshots are deterministic
+        // Set fuzz seed and disable fuzzing from state so gas snapshots are deterministic.
         self.test.fuzz_seed = Some(U256::from_be_bytes(STATIC_FUZZ_SEED));
+        self.test.fuzz_dictionary_weight = Some(0);
 
         let outcome = self.test.execute_tests().await?;
         outcome.ensure_ok()?;

crates/forge/bin/cmd/test/mod.rs

@@ -102,6 +102,10 @@ pub struct TestArgs {
     #[arg(long)]
     pub fuzz_seed: Option<U256>,
 
+    /// Set fuzz dictionary weight.
+    #[arg(long)]
+    pub fuzz_dictionary_weight: Option<u32>,
+
     #[arg(long, env = "FOUNDRY_FUZZ_RUNS", value_name = "RUNS")]
     pub fuzz_runs: Option<u64>,
 
@@ -227,6 +231,11 @@ impl TestArgs {
             config.invariant.gas_report_samples = 0;
         }
 
+        // Set fuzz dictionary weight if specified as arg.
+        if let Some(dictionary_weight) = self.fuzz_dictionary_weight {
+            config.fuzz.dictionary.dictionary_weight = dictionary_weight;
+        }
+
         // Set up the project.
         let mut project = config.project()?;