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+;;; test-wttrin-smoke.el --- Smoke tests for wttrin package loading -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2024 Craig Jennings
+
+;;; Commentary:
+;; Smoke tests to verify wttrin package loads correctly and core
+;; infrastructure is available.  These are sanity checks that catch:
+;; - Package installation issues
+;; - Missing dependencies
+;; - Public API breakage
+;; - Autoload cookie problems
+;; - Package metadata issues
+;;
+;; These tests do NOT test functionality (that's in unit tests).
+;; They only verify that functions/variables exist and have correct types.
+
+;;; Code:
+
+(require 'ert)
+(require 'wttrin)
+
+;;; Package Loading Tests
+
+(ert-deftest test-wttrin-smoke-package-loads ()
+  "Test that wttrin package loads without errors.
+If we got here, the package loaded successfully via (require 'wttrin)."
+  (should t))
+
+(ert-deftest test-wttrin-smoke-provide-statement ()
+  "Test that wttrin feature is provided."
+  (should (featurep 'wttrin)))
+
+;;; Dependency Tests
+
+(ert-deftest test-wttrin-smoke-xterm-color-available ()
+  "Test that xterm-color dependency is available.
+This is a REQUIRED dependency - wttrin cannot function without it."
+  (should (featurep 'xterm-color)))
+
+(ert-deftest test-wttrin-smoke-url-available ()
+  "Test that url library is available (built-in)."
+  (should (require 'url nil t)))
+
+;;; Function Availability Tests
+
+(ert-deftest test-wttrin-smoke-main-command-defined ()
+  "Test that main wttrin command is defined."
+  (should (fboundp 'wttrin)))
+
+(ert-deftest test-wttrin-smoke-main-command-is-interactive ()
+  "Test that main wttrin command is interactive."
+  (should (commandp 'wttrin)))
+
+(ert-deftest test-wttrin-smoke-wttrin-mode-defined ()
+  "Test that wttrin-mode is defined."
+  (should (fboundp 'wttrin-mode)))
+
+(ert-deftest test-wttrin-smoke-mode-line-mode-defined ()
+  "Test that wttrin-mode-line-mode is defined."
+  (should (fboundp 'wttrin-mode-line-mode)))
+
+(ert-deftest test-wttrin-smoke-clear-cache-defined ()
+  "Test that cache clear command is defined."
+  (should (fboundp 'wttrin-clear-cache)))
+
+;;; Configuration Variable Tests
+
+(ert-deftest test-wttrin-smoke-defcustoms-exist ()
+  "Test that key defcustom variables are defined."
+  (should (boundp 'wttrin-default-locations))
+  (should (boundp 'wttrin-unit-system))
+  (should (boundp 'wttrin-cache-ttl))
+  (should (boundp 'wttrin-cache-max-entries))
+  (should (boundp 'wttrin-mode-line-favorite-location))
+  (should (boundp 'wttrin-mode-line-refresh-interval))
+  (should (boundp 'wttrin-mode-line-startup-delay)))
+
+(ert-deftest test-wttrin-smoke-internal-vars-exist ()
+  "Test that internal variables are defined."
+  (should (boundp 'wttrin--cache))
+  (should (boundp 'wttrin--mode-line-map))
+  (should (boundp 'wttrin-mode-line-string)))
+
+;;; Keymap Tests
+
+(ert-deftest test-wttrin-smoke-wttrin-mode-map-exists ()
+  "Test that wttrin-mode keymap exists and is a keymap."
+  (should (boundp 'wttrin-mode-map))
+  (should (keymapp wttrin-mode-map)))
+
+(ert-deftest test-wttrin-smoke-mode-line-map-exists ()
+  "Test that mode-line keymap exists and is a keymap."
+  (should (boundp 'wttrin--mode-line-map))
+  (should (keymapp wttrin--mode-line-map)))
+
+;;; Package Metadata Tests
+
+(ert-deftest test-wttrin-smoke-package-version ()
+  "Test that package has version information in correct format."
+  ;; Verify the Version header exists in the file
+  (let ((version-line (with-temp-buffer
+                        (insert-file-contents "wttrin.el" nil 0 500)
+                        (goto-char (point-min))
+                        (re-search-forward "^;; Version: \\([0-9.]+\\)" nil t)
+                        (match-string 1))))
+    (should version-line)
+    (should (string-match-p "^[0-9]+\\.[0-9]+\\.[0-9]+$" version-line))))
+
+(ert-deftest test-wttrin-smoke-autoload-cookies ()
+  "Test that key functions have autoload cookies in source."
+  ;; Verify autoload cookies exist (they become effective after package install)
+  (let ((source (with-temp-buffer
+                  (insert-file-contents "wttrin.el")
+                  (buffer-string))))
+    ;; Main command should have autoload
+    (should (string-match-p ";;;###autoload\n(defun wttrin" source))
+    ;; Mode-line mode should have autoload
+    (should (string-match-p ";;;###autoload\n(define-minor-mode wttrin-mode-line-mode" source))))
+
+(provide 'test-wttrin-smoke)
+;;; test-wttrin-smoke.el ends here