shell: Add (minimal) tests.

shell/caucase.sh

@@ -1109,5 +1109,49 @@ EOF
       fi
     fi
   }
-  _main "$@"
+  _test() {
+    # shellcheck disable=SC2039
+    local netloc="$1" \
+      tmp_dir \
+      caucased_dir \
+      caucased_pid
+    echo 'Automated testing...'
+    if command -v caucased > /dev/null; then
+      :
+    else
+      echo 'caucased not found in PATH, cannot run tests' >&2
+      return 1
+    fi
+    tmp_dir="$(mktemp -d --suffix=caucase_sh)"
+    caucased_dir="$tmp_dir/caucased"
+    caucased --db "$caucased_dir/db.sqlite" --netloc "$netloc" &
+    caucased_pid="$!"
+    trap "kill \"$caucased_pid\"; wait; rm -rf \"$tmp_dir\"" EXIT
+    if cd "$tmp_dir"; then
+      :
+    else
+      echo 'Could not setup temporary directory'
+    fi
+    _main --ca-url "http://$netloc" --update-user
+    if [ -r cas.crt.pem ]; then
+      echo 'cas.crt.pem not created'
+      return 1
+    fi
+    if [ -r cau.crt.pem ]; then
+      echo 'cau.crt.pem not created'
+      return 1
+    fi
+  }
+  if [ "$#" -gt 0 ] && [ "x$1" = 'x--test' ]; then
+    if [ "$#" -eq 1 ]; then
+      _test "localhost:8000"
+    elif [ "$#" -eq 2 ]; then
+      _test "$2"
+    else
+      echo 'Usage: --test [<hostname/address>:<port>]'
+      return 1
+    fi
+  else
+    _main "$@"
+  fi
 fi