Fix https://github.com/StackExchange/blackbox/issues/193

Add unit tests to tools/confidence_test.sh to verify admin operations work.

bin/blackbox_list_admins

@@ -5,4 +5,4 @@
 #
 set -e
 source "${0%/*}/_blackbox_common.sh"
-cat "$BB_ADMINS_FILE"
+cat "$BB_ADMINS"

tools/confidence_test.sh

@@ -84,6 +84,10 @@ PHASE 'and adds herself as an admin.'
 blackbox_addadmin alice@example.com
 git commit -m'NEW ADMIN: alice@example.com' keyrings/live/pubring.??? keyrings/live/trustdb.gpg keyrings/live/blackbox-admins.txt
 
+make_self_deleting_tempfile adminlist1
+blackbox_list_admins >"$adminlist1"
+assert_file_md5hash "$adminlist1" "aa1db827772e1d51d453b844394b7617"
+
 
 PHASE 'Bob arrives.'
 
@@ -112,6 +116,10 @@ echo '========== Bob enrolls himself too.'
 blackbox_addadmin bob@example.com
 git commit -m'NEW ADMIN: alice@example.com' keyrings/live/pubring.??? keyrings/live/trustdb.gpg keyrings/live/blackbox-admins.txt
 
+make_self_deleting_tempfile adminlist2
+blackbox_list_admins >"$adminlist2"
+assert_file_md5hash "$adminlist2" "0b82b0b3c96e6e5dd5faf60493fe5cf7"
+
 PHASE 'Alice does the second part to enroll bob.'
 become_alice
 
@@ -217,6 +225,10 @@ PHASE 'Bob removes Alice.'
 blackbox_removeadmin alice@example.com
 assert_line_not_exists 'alice@example.com' keyrings/live/blackbox-admins.txt
 
+make_self_deleting_tempfile adminlist3
+blackbox_list_admins >"$adminlist3"
+assert_file_md5hash "$adminlist3" "aadbfafd76ea66ff40dbfd239a69067f"
+
 PHASE 'Bob reencrypts files so alice can not access them.'
 blackbox_update_all_files
 
@@ -391,6 +403,10 @@ fi
 # Cleanup:
 blackbox_removeadmin abba@notarealuser.com
 
+make_self_deleting_tempfile adminlist4
+blackbox_list_admins >"$adminlist4"
+assert_file_md5hash "$adminlist4" "aadbfafd76ea66ff40dbfd239a69067f"
+
 
 # TODO: Create a new directory. "git clone" the repo into it.