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;;; test-wttrin--buffer-cache-refresh.el --- Tests for wttrin--buffer-cache-refresh -*- lexical-binding: t; -*-
;; Copyright (C) 2025-2026 Craig Jennings
;;; Commentary:
;; Unit tests for wttrin--buffer-cache-refresh function.
;; Tests the proactive background refresh that keeps buffer cache fresh.
;;; Code:
(require 'ert)
(require 'wttrin)
(require 'testutil-wttrin)
;;; Setup and Teardown
(defun test-wttrin--buffer-cache-refresh-setup ()
"Setup for buffer-cache-refresh tests."
(testutil-wttrin-setup))
(defun test-wttrin--buffer-cache-refresh-teardown ()
"Teardown for buffer-cache-refresh tests."
(testutil-wttrin-teardown))
;;; Normal Cases
(ert-deftest test-wttrin--buffer-cache-refresh-normal-success-updates-cache ()
"Successful fetch should store fresh data in the buffer cache."
(test-wttrin--buffer-cache-refresh-setup)
(unwind-protect
(let ((wttrin-favorite-location "Paris"))
(testutil-wttrin-mock-http-response "Fresh weather data for Paris"
(wttrin--buffer-cache-refresh)
;; Cache should now have an entry for Paris
(let* ((cache-key (wttrin--make-cache-key "Paris"))
(cached (gethash cache-key wttrin--cache)))
(should cached)
(should (equal (cdr cached) "Fresh weather data for Paris")))))
(test-wttrin--buffer-cache-refresh-teardown)))
(ert-deftest test-wttrin--buffer-cache-refresh-normal-uses-favorite-location ()
"Refresh should fetch weather for the configured favorite location."
(test-wttrin--buffer-cache-refresh-setup)
(unwind-protect
(let ((wttrin-favorite-location "Tokyo, JP")
(fetched-query nil))
(cl-letf (((symbol-function 'wttrin-fetch-raw-string)
(lambda (query callback)
(setq fetched-query query)
(funcall callback "some data"))))
(wttrin--buffer-cache-refresh)
(should (equal fetched-query "Tokyo, JP"))))
(test-wttrin--buffer-cache-refresh-teardown)))
(ert-deftest test-wttrin--buffer-cache-refresh-normal-cache-key-respects-unit-system ()
"Cache entry should use the correct key based on unit system settings."
(test-wttrin--buffer-cache-refresh-setup)
(unwind-protect
(let ((wttrin-favorite-location "Paris")
(wttrin-unit-system "m"))
(testutil-wttrin-mock-http-response "metric data"
(wttrin--buffer-cache-refresh)
;; Cache key should include unit system
(let* ((expected-key (wttrin--make-cache-key "Paris"))
(cached (gethash expected-key wttrin--cache)))
(should cached)
(should (equal (cdr cached) "metric data")))))
(test-wttrin--buffer-cache-refresh-teardown)))
;;; Boundary Cases
(ert-deftest test-wttrin--buffer-cache-refresh-boundary-nil-location-is-noop ()
"When favorite-location is nil, no fetch should be attempted."
(test-wttrin--buffer-cache-refresh-setup)
(unwind-protect
(let ((wttrin-favorite-location nil)
(fetch-called nil))
(cl-letf (((symbol-function 'wttrin-fetch-raw-string)
(lambda (_query _callback) (setq fetch-called t))))
(wttrin--buffer-cache-refresh)
(should-not fetch-called)
(should (= 0 (testutil-wttrin-cache-size)))))
(test-wttrin--buffer-cache-refresh-teardown)))
(ert-deftest test-wttrin--buffer-cache-refresh-boundary-overwrites-stale-entry ()
"A refresh should replace any existing stale cache entry for the same location."
(test-wttrin--buffer-cache-refresh-setup)
(unwind-protect
(let ((wttrin-favorite-location "Paris"))
;; Seed cache with old data
(testutil-wttrin-add-to-cache "Paris" "old stale data" 9999)
(testutil-wttrin-mock-http-response "fresh new data"
(wttrin--buffer-cache-refresh)
(let* ((cache-key (wttrin--make-cache-key "Paris"))
(cached (gethash cache-key wttrin--cache)))
(should (equal (cdr cached) "fresh new data")))))
(test-wttrin--buffer-cache-refresh-teardown)))
;;; Error Cases
(ert-deftest test-wttrin--buffer-cache-refresh-error-fetch-failure-preserves-cache ()
"Failed fetch should not overwrite existing cache entry."
(test-wttrin--buffer-cache-refresh-setup)
(unwind-protect
(let ((wttrin-favorite-location "Paris"))
;; Seed cache with existing data
(testutil-wttrin-add-to-cache "Paris" "existing good data" 300)
(cl-letf (((symbol-function 'wttrin-fetch-raw-string)
(lambda (_query callback) (funcall callback nil))))
(wttrin--buffer-cache-refresh)
;; Existing cache should be untouched
(let* ((cache-key (wttrin--make-cache-key "Paris"))
(cached (gethash cache-key wttrin--cache)))
(should cached)
(should (equal (cdr cached) "existing good data")))))
(test-wttrin--buffer-cache-refresh-teardown)))
(provide 'test-wttrin--buffer-cache-refresh)
;;; test-wttrin--buffer-cache-refresh.el ends here
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