completely rewrote test suite for top level src files and all builtin files

src/state.rs

@@ -32,12 +32,20 @@ use crate::{
   shopt::ShOpts,
 };
 
+thread_local! {
+  pub static SHED: Shed = Shed::new();
+}
+
+#[derive(Clone,Debug)]
 pub struct Shed {
   pub jobs: RefCell<JobTab>,
   pub var_scopes: RefCell<ScopeStack>,
   pub meta: RefCell<MetaTab>,
   pub logic: RefCell<LogTab>,
   pub shopts: RefCell<ShOpts>,
+
+	#[cfg(test)]
+	saved: RefCell<Option<Box<Self>>>,
 }
 
 impl Shed {
@@ -48,6 +56,9 @@ impl Shed {
       meta: RefCell::new(MetaTab::new()),
       logic: RefCell::new(LogTab::new()),
       shopts: RefCell::new(ShOpts::default()),
+
+			#[cfg(test)]
+			saved: RefCell::new(None),
     }
   }
 }
@@ -58,6 +69,31 @@ impl Default for Shed {
   }
 }
 
+#[cfg(test)]
+impl Shed {
+	pub fn save(&self) {
+		let saved = Self {
+			jobs: RefCell::new(self.jobs.borrow().clone()),
+			var_scopes: RefCell::new(self.var_scopes.borrow().clone()),
+			meta: RefCell::new(self.meta.borrow().clone()),
+			logic: RefCell::new(self.logic.borrow().clone()),
+			shopts: RefCell::new(self.shopts.borrow().clone()),
+			saved: RefCell::new(None),
+		};
+		*self.saved.borrow_mut() = Some(Box::new(saved));
+	}
+
+	pub fn restore(&self) {
+		if let Some(saved) = self.saved.take() {
+			*self.jobs.borrow_mut() = saved.jobs.into_inner();
+			*self.var_scopes.borrow_mut() = saved.var_scopes.into_inner();
+			*self.meta.borrow_mut() = saved.meta.into_inner();
+			*self.logic.borrow_mut() = saved.logic.into_inner();
+			*self.shopts.borrow_mut() = saved.shopts.into_inner();
+		}
+	}
+}
+
 #[derive(Hash, Eq, PartialEq, Debug, Clone, Copy)]
 pub enum ShellParam {
   // Global
@@ -485,10 +521,6 @@ impl ScopeStack {
   }
 }
 
-thread_local! {
-  pub static SHED: Shed = Shed::new();
-}
-
 #[derive(Clone, Debug)]
 pub struct ShAlias {
   pub body: String,
@@ -1258,7 +1290,7 @@ impl VarTab {
 }
 
 /// A table of metadata for the shell
-#[derive(Default, Debug)]
+#[derive(Clone, Default, Debug)]
 pub struct MetaTab {
   // command running duration
   runtime_start: Option<Instant>,