Fixes after using setopt nounset during tests

Also add tests for unset variable with varstash.

tests/autoenv.t

@@ -12,7 +12,7 @@ Manually create auth file
 
 Now try to make it accept it
 
-  $ unset _autoenv_stack_entered
+  $ _autoenv_stack_entered=()
   $ rm $AUTOENV_ENV_FILENAME
   $ _autoenv_ask_for_yes() { echo "yes" }
   $ cd .
@@ -33,11 +33,11 @@ The last "ENTERED" is because it executed the command.
 
 Now lets see that it actually checks the shasum value.
 
-  $ unset _autoenv_stack_entered
+  $ _autoenv_stack_entered=()
   $ cd .
   ENTERED
 
-  $ unset _autoenv_stack_entered
+  $ _autoenv_stack_entered=()
   $ rm $AUTOENV_ENV_FILENAME
   $ test_autoenv_add_to_env $PWD/.env mischief
   $ cd .
@@ -56,7 +56,7 @@ Now lets see that it actually checks the shasum value.
 
 Now, will it take no for an answer?
 
-  $ unset _autoenv_stack_entered
+  $ _autoenv_stack_entered=()
   $ rm $AUTOENV_ENV_FILENAME
   $ _autoenv_ask_for_yes() { echo "no"; return 1 }
   $ cd .

tests/setup.sh

@@ -1,6 +1,10 @@
 # Ensure we have our mocked out AUTOENV_ENV_FILENAME
 # (via .zshenv).
 
+# Treat unset variables as errors.
+# Not handled in varstash yet.
+# setopt nounset
+
 [[ $AUTOENV_ENV_FILENAME[0,4] == '/tmp' ]] || return 1
 
 # Reset any authentication.
@@ -8,7 +12,7 @@ echo -n > $AUTOENV_ENV_FILENAME
 
 # Add file $1 (with optional hash $2) to authentication file.
 test_autoenv_add_to_env() {
-  _autoenv_hash_pair $1 $2 >> $AUTOENV_ENV_FILENAME
+  _autoenv_hash_pair $1 ${2:-} >> $AUTOENV_ENV_FILENAME
 }
 
 # Add enter and leave env files to authentication file.

tests/varstash.t

@@ -36,31 +36,23 @@ Test autounstashing when leaving a directory.  {{{
 
 Setup:
 
+  $ unset VAR
   $ cd sub
   ENTER
   $ echo 'echo ENTER; autostash VAR=changed' > $AUTOENV_FILE_ENTER
   $ echo 'echo LEAVE; echo "no explicit call to autounstash"' > $AUTOENV_FILE_LEAVE
   $ test_autoenv_auth_env_files
 
-$VAR is empty:
+$VAR is unset:
 
-  $ echo VAR:$VAR
-  VAR:
+  $ echo VAR_set:$+VAR
+  VAR_set:0
 
-Set it:
+Trigger the autostashing in the enter file.
 
-  $ VAR=orig
   $ cd ..
   LEAVE
   no explicit call to autounstash
-
-Leaving the directory keeps it intact - nothing had been stashed yet.
-
-  $ echo $VAR
-  orig
-
-Enter the dir, trigger the autostashing.
-
   $ cd sub
   ENTER
   $ echo $VAR
@@ -71,9 +63,8 @@ Now leave again.
   $ cd ..
   LEAVE
   no explicit call to autounstash
-  $ echo $VAR
-  orig
-
+  $ echo VAR_set:$+VAR
+  VAR_set:0
 
 Remove the leave file, auto-unstashing should still happen.
 
@@ -83,7 +74,20 @@ Remove the leave file, auto-unstashing should still happen.
   $ echo $VAR
   changed
   $ cd ..
+  $ echo VAR_set:$+VAR
+  VAR_set:0
+
+And once again where a value gets restored.
+
+  $ VAR=orig_2
   $ echo $VAR
-  orig
+  orig_2
+  $ cd sub
+  ENTER
+  $ echo $VAR
+  changed
+  $ cd ..
+  $ echo $VAR
+  orig_2
 
 }}}