Removed assert_link_exist function

This is now provided by the used version of bats-file.

test/test_helper.bash

@@ -85,48 +85,3 @@ teardown() {
   rm -rf "${BASH_IT_TEST_DIR}"
   temp_del "${TEST_TEMP_DIR}"
 }
-
-# Fail and display path of the link if it does not exist. Also fails
-# if the path exists, but is not a link.
-# This function is the logical complement of `assert_file_not_exist'.
-# There is no dedicated function for checking that a link does not exist.
-#
-# Globals:
-#   BATSLIB_FILE_PATH_REM
-#   BATSLIB_FILE_PATH_ADD
-# Arguments:
-#   $1 - path
-# Returns:
-#   0 - link exists and is a link
-#   1 - otherwise
-# Outputs:
-#   STDERR - details, on failure
-assert_link_exist() {
-  local -r file="$1"
-  local -r target="$2"
-  if [[ ! -L "$file" ]]; then
-    local -r rem="$BATSLIB_FILE_PATH_REM"
-    local -r add="$BATSLIB_FILE_PATH_ADD"
-    if [[ -e "$file" ]]; then
-      batslib_print_kv_single 4 'path' "${file/$rem/$add}" \
-        | batslib_decorate 'exists, but is not a link' \
-        | fail
-    else
-      batslib_print_kv_single 4 'path' "${file/$rem/$add}" \
-        | batslib_decorate 'link does not exist' \
-        | fail
-    fi
-  else
-    if [ -n "$target" ]; then
-      local link_target=''
-      link_target=$(readlink "$file")
-      if [[ "$link_target" != "$target" ]]; then
-        batslib_print_kv_single_or_multi 8 'path' "${file/$rem/$add}" \
-            'expected' "$target" \
-            'actual'   "$link_target" \
-          | batslib_decorate 'link exists, but does not point to target file' \
-          | fail
-      fi
-    fi
-  fi
-}