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;;; test-wttrin--format-staleness-header.el --- Tests for staleness header -*- lexical-binding: t; -*-
;; Copyright (C) 2025-2026 Craig Jennings
;;; Commentary:
;; Unit tests for wttrin--format-staleness-header function.
;; Tests that buffer staleness information is formatted correctly.
;;; Code:
(require 'ert)
(require 'wttrin)
(require 'testutil-wttrin)
;;; Setup and Teardown
(defun test-wttrin--format-staleness-header-setup ()
"Setup for staleness header tests."
(testutil-wttrin-setup))
(defun test-wttrin--format-staleness-header-teardown ()
"Teardown for staleness header tests."
(testutil-wttrin-teardown))
;;; Normal Cases
(ert-deftest test-wttrin--format-staleness-header-normal-returns-formatted-string ()
"Staleness header includes time and age when cache exists."
(test-wttrin--format-staleness-header-setup)
(unwind-protect
(let ((now 1000000.0))
(cl-letf (((symbol-function 'float-time) (lambda () now)))
;; Add data cached 5 minutes ago
(testutil-wttrin-add-to-cache "Paris" "weather data" 300)
(let ((header (wttrin--format-staleness-header "Paris")))
(should header)
(should (string-match-p "Last updated:" header))
(should (string-match-p "5 minutes ago" header)))))
(test-wttrin--format-staleness-header-teardown)))
(ert-deftest test-wttrin--format-staleness-header-normal-just-now ()
"Staleness header shows 'just now' for very recent data."
(test-wttrin--format-staleness-header-setup)
(unwind-protect
(let ((now 1000000.0))
(cl-letf (((symbol-function 'float-time) (lambda () now)))
(testutil-wttrin-add-to-cache "Paris" "weather data" 10)
(let ((header (wttrin--format-staleness-header "Paris")))
(should (string-match-p "just now" header)))))
(test-wttrin--format-staleness-header-teardown)))
;;; Boundary Cases
(ert-deftest test-wttrin--format-staleness-header-boundary-no-cache-returns-nil ()
"Returns nil when no cache entry exists for location."
(test-wttrin--format-staleness-header-setup)
(unwind-protect
(should-not (wttrin--format-staleness-header "Unknown City"))
(test-wttrin--format-staleness-header-teardown)))
(ert-deftest test-wttrin--format-staleness-header-boundary-different-unit-system ()
"Cache lookup respects current unit system setting."
(test-wttrin--format-staleness-header-setup)
(unwind-protect
(let ((now 1000000.0))
(cl-letf (((symbol-function 'float-time) (lambda () now)))
;; Add data under metric unit system
(let ((wttrin-unit-system "m"))
(testutil-wttrin-add-to-cache "Paris" "metric data" 300))
;; Query under imperial unit system — should find nothing
(let ((wttrin-unit-system "u"))
(should-not (wttrin--format-staleness-header "Paris")))
;; Query under metric — should find it
(let ((wttrin-unit-system "m"))
(should (wttrin--format-staleness-header "Paris")))))
(test-wttrin--format-staleness-header-teardown)))
(provide 'test-wttrin--format-staleness-header)
;;; test-wttrin--format-staleness-header.el ends here
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