Made corrections to test

test/build/40_pull.bats

@@ -557,11 +557,15 @@ EOF
 }
 
 @test 'remove part_ files' {
-    export CH_IMAGE_STORAGE=/var/tmp/albug
+    export CH_IMAGE_STORAGE=/var/tmp/tmpdir
+    ch-image pull alpine
+
+   # create directory
+    mkdir -p /var/tmp/tmpdir/dlcache
+
+    # create a part_ file
+    touch /var/tmp/tmpdir/dlcache/part_PROBLEM
 
-    # create a part_ file 
-    touch /var/tmp/albug/dlcache/part_PROBLEM
-
     # list images to invoke error
     set +e
     out=$(ch-image list 2>&1)
@@ -571,12 +575,13 @@ EOF
     echo "--- return code: ${retcode}"
     echo '--- output:'
     echo "$out"
-
+
+    # clean up the directory
+    rm -rf /var/tmp/tmpdir
+
     # check if output errors
     if [[ $retcode -ne 0 ]]; then
         echo "fail: part_ file wasn't cleaned properly."
-        # Clean up the file if the test fails
-        rm /var/tmp/albug/dlcache/part_PROBLEM
         exit 1
     fi
 }