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+;;; test-calendar-sync--unfold-continuation.el --- Tests for RFC 5545 line unfolding -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for calendar-sync--unfold-continuation.
+;; Unfolds RFC 5545 continuation lines (lines starting with space/tab after newline).
+;; Returns (unfolded-value . new-position) cons.
+
+;;; Code:
+
+(require 'ert)
+(require 'testutil-calendar-sync)
+(require 'calendar-sync)
+
+;;; Normal Cases
+
+(ert-deftest test-calendar-sync--unfold-continuation-normal-single-continuation ()
+  "Single continuation line is appended to value."
+  ;; Simulate how get-property calls unfold-continuation: match-end is
+  ;; the position right after the matched value on the first line.
+  ;; "DESCRIPTION:First part" is 22 chars, so match-end for the value = 22.
+  ;; The \n at position 22 starts the continuation check.
+  (let* ((text "DESCRIPTION:First part\n Second part\nNEXT:value"))
+    ;; Use get-property which exercises unfold-continuation with correct positions
+    (should (equal "First partSecond part"
+                   (calendar-sync--get-property text "DESCRIPTION")))))
+
+(ert-deftest test-calendar-sync--unfold-continuation-normal-multiple-continuations ()
+  "Multiple continuation lines are all appended."
+  (let* ((text "DESC:Line1\n Line2\n Line3\nNEXT:x"))
+    (should (equal "Line1Line2Line3"
+                   (calendar-sync--get-property text "DESC")))))
+
+;;; Boundary Cases
+
+(ert-deftest test-calendar-sync--unfold-continuation-boundary-no-continuation ()
+  "No continuation lines returns value unchanged."
+  (let* ((text "SUMMARY:Test\nDTSTART:20260315"))
+    (should (equal "Test" (calendar-sync--get-property text "SUMMARY")))))
+
+(ert-deftest test-calendar-sync--unfold-continuation-boundary-tab-continuation ()
+  "Tab-indented continuation lines are also unfolded."
+  (let* ((text "DESC:Start\n\tTabbed\nNEXT:x"))
+    (should (equal "StartTabbed" (calendar-sync--get-property text "DESC")))))
+
+;;; Error Cases
+
+(ert-deftest test-calendar-sync--unfold-continuation-error-start-at-end ()
+  "Value at end of text with no continuation returns unchanged."
+  (let* ((text "SUMMARY:Test"))
+    (should (equal "Test" (calendar-sync--get-property text "SUMMARY")))))
+
+(provide 'test-calendar-sync--unfold-continuation)
+;;; test-calendar-sync--unfold-continuation.el ends here