fix(forge test): install missing dependencies before creating `Projec…

…t` (#9379)

* fix(forge test): install missing dependencies before instantiating the project

* optimization

crates/config/src/lib.rs

@@ -904,6 +904,9 @@ impl Config {
     ) -> Result<BTreeMap<PathBuf, RestrictionsWithVersion<MultiCompilerRestrictions>>, SolcError>
     {
         let mut map = BTreeMap::new();
+        if self.compilation_restrictions.is_empty() {
+            return Ok(BTreeMap::new());
+        }
 
         let graph = Graph::<MultiCompilerParsedSource>::resolve(paths)?;
         let (sources, _) = graph.into_sources();

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

@@ -280,16 +280,15 @@ impl TestArgs {
             config.invariant.gas_report_samples = 0;
         }
 
-        // Set up the project.
-        let mut project = config.project()?;
-
         // Install missing dependencies.
         if install::install_missing_dependencies(&mut config) && config.auto_detect_remappings {
             // need to re-configure here to also catch additional remappings
             config = self.load_config();
-            project = config.project()?;
         }
 
+        // Set up the project.
+        let project = config.project()?;
+
         let mut filter = self.filter(&config);
         trace!(target: "forge::test", ?filter, "using filter");