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+;;; test-signel-input-preservation.el --- Regression for signel #2 input clobber -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; signel-chat-mode buffers have an editable prompt area starting at
+;; `signel--input-marker'.  Before this fix, both `signel--insert-msg' (the
+;; receive path) and `signel--insert-system-msg' (the RPC-error path)
+;; called `(delete-region (point) (point-max))' to clear the old prompt
+;; before redrawing it, which destroyed any text the user was mid-typing.
+;;
+;; These tests lock the preservation contract: a small `signel--pending-input'
+;; helper captures the in-progress input from the marker to `point-max', and
+;; both inserters restore it after the freshly drawn prompt.  The chat-mode
+;; buffer is constructed in a temp buffer; `signel--insert-msg' is steered
+;; to it via a stub on `signel--get-buffer'.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(eval-and-compile
+  (add-to-list 'load-path (expand-file-name "~/code/signel")))
+(require 'signel)
+
+(defmacro test-signel--with-chat-buffer (&rest body)
+  "Set up a temp signel-chat-mode buffer with prompt drawn and run BODY."
+  (declare (indent 0))
+  `(with-temp-buffer
+     (signel-chat-mode)
+     (setq signel--chat-id "+15555550100")
+     (signel--draw-prompt)
+     ,@body))
+
+(ert-deftest test-signel-input-pending-returns-typed-text ()
+  "Normal: with text after the prompt marker, `signel--pending-input'
+returns the captured text."
+  (test-signel--with-chat-buffer
+    (insert "halfwritten")
+    (should (equal (signel--pending-input) "halfwritten"))))
+
+(ert-deftest test-signel-input-pending-returns-nil-when-empty ()
+  "Boundary: an empty input area returns nil so callers don't restore an
+empty string after the prompt."
+  (test-signel--with-chat-buffer
+    (should-not (signel--pending-input))))
+
+(ert-deftest test-signel-input-system-msg-preserves-pending-input ()
+  "Regression for #2: `signel--insert-system-msg' redraws the prompt
+without clobbering text the user was mid-typing."
+  (test-signel--with-chat-buffer
+    (insert "halfwritten")
+    (signel--insert-system-msg "An error happened" 'signel-error-face)
+    (should (string-match-p "An error happened" (buffer-string)))
+    (should (equal (signel--pending-input) "halfwritten"))))
+
+(ert-deftest test-signel-input-msg-preserves-pending-input ()
+  "Regression for #2: `signel--insert-msg' (the receive path) redraws the
+prompt without clobbering the user's in-progress input."
+  (test-signel--with-chat-buffer
+    (insert "halfwritten")
+    (cl-letf (((symbol-function 'signel--get-buffer)
+               (lambda (_) (current-buffer))))
+      (signel--insert-msg "+15555550100" "Alice" "Hi there" nil nil nil))
+    (should (string-match-p "Hi there" (buffer-string)))
+    (should (equal (signel--pending-input) "halfwritten"))))
+
+(provide 'test-signel-input-preservation)
+;;; test-signel-input-preservation.el ends here