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;;; test-wttrin--debug-log.el --- Tests for wttrin--debug-log -*- lexical-binding: t; -*-
;; Copyright (C) 2025-2026 Craig Jennings
;;; Commentary:
;; Unit tests for wttrin--debug-log. Verifies that messages are appended
;; only when `wttrin-debug' is non-nil, that format args are interpolated,
;; and that entries are timestamped (timestamp . message) cons cells.
;;; Code:
(require 'ert)
(require 'wttrin)
(require 'testutil-wttrin)
(require 'wttrin-debug
(expand-file-name "wttrin-debug.el"
(file-name-directory (locate-library "wttrin"))))
;;; Normal Cases
(ert-deftest test-wttrin--debug-log-normal-appends-entry-when-debug-enabled ()
"Calling debug-log with debug enabled appends a single entry."
(let ((wttrin-debug t)
(wttrin--debug-log nil))
(wttrin--debug-log "hello")
(should (= 1 (length wttrin--debug-log)))))
(ert-deftest test-wttrin--debug-log-normal-interpolates-format-args ()
"Format args are passed through `format' before storage."
(let ((wttrin-debug t)
(wttrin--debug-log nil))
(wttrin--debug-log "value=%d name=%s" 42 "foo")
(should (string= "value=42 name=foo" (cdar wttrin--debug-log)))))
(ert-deftest test-wttrin--debug-log-normal-prepends-most-recent-entry ()
"Most recent entry is at the head of the log (push semantics)."
(let ((wttrin-debug t)
(wttrin--debug-log nil))
(wttrin--debug-log "first")
(wttrin--debug-log "second")
(should (string= "second" (cdar wttrin--debug-log)))
(should (string= "first" (cdadr wttrin--debug-log)))))
(ert-deftest test-wttrin--debug-log-normal-timestamp-has-millisecond-format ()
"Timestamp is a string in HH:MM:SS.mmm format."
(let ((wttrin-debug t)
(wttrin--debug-log nil))
(wttrin--debug-log "anything")
(should (string-match-p "^[0-9]\\{2\\}:[0-9]\\{2\\}:[0-9]\\{2\\}\\.[0-9]\\{3\\}$"
(caar wttrin--debug-log)))))
;;; Boundary Cases
(ert-deftest test-wttrin--debug-log-boundary-empty-format-string-stores-empty-message ()
"An empty format string produces an entry with an empty message."
(let ((wttrin-debug t)
(wttrin--debug-log nil))
(wttrin--debug-log "")
(should (= 1 (length wttrin--debug-log)))
(should (string= "" (cdar wttrin--debug-log)))))
(ert-deftest test-wttrin--debug-log-boundary-no-format-args-stores-literal-string ()
"Calling with only a format string and no args stores it as-is."
(let ((wttrin-debug t)
(wttrin--debug-log nil))
(wttrin--debug-log "literal text with no format directives")
(should (string= "literal text with no format directives"
(cdar wttrin--debug-log)))))
;;; Error Cases
(ert-deftest test-wttrin--debug-log-error-no-entry-when-debug-disabled ()
"When wttrin-debug is nil, debug-log adds nothing."
(let ((wttrin-debug nil)
(wttrin--debug-log nil))
(wttrin--debug-log "should not appear")
(should-not wttrin--debug-log)))
(provide 'test-wttrin--debug-log)
;;; test-wttrin--debug-log.el ends here
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