use mktemp

tests/Setup and Teardown/.test/setup

@@ -1,3 +1 @@
-#!/bin/sh
-
-echo setup has run >> .log
+echo setup has run >> $log

tests/Setup and Teardown/.test/setup has run twice a

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-[ $(grep -c 'setup has run' .log) -gt '2' ]
+[ $(grep -c 'setup has run' $log) -gt '2' ]

tests/Setup and Teardown/.test/setup_dir

@@ -1,4 +1,3 @@
-#!/bin/sh
-
-echo > .log
-echo setup_dir has run >> .log
+export log=$(mktemp)
+> $log
+echo setup_dir has run >> $log

tests/Setup and Teardown/.test/teardown

@@ -1,3 +1 @@
-#!/bin/sh
-
 echo teardown has run >> .log

tests/Setup and Teardown/.test/teardown_dir

@@ -1,3 +1 @@
-#!/bin/sh
-
-rm .log
+rm $log