test: card presenters with mocked presentation-prompt

9 ERT tests covering the per-card-type presentation functions:

- present-simple-card: clozes hidden during prompt, return value
  passthrough, overlays cleaned up after via with-hidden-cloze-text
- present-default-answer: drill-answer slot path (overlay-displays
  the answer), unhide path (reveals body, calls reschedule-fn)
- present-card-using-text: replaces body with question, sets
  drill-answer slot when ANSWER arg provided
- present-two-sided-card and present-multi-sided-card: run cleanly
  on 2-side and 3-side cards

1 files changed, 210 insertions, 0 deletions

diff --git a/tests/test-org-drill-card-presenters.el b/tests/test-org-drill-card-presenters.el
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+;;; test-org-drill-card-presenters.el --- Tests for card presentation functions  -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for the functions that show a card to the user:
+;;
+;; - `org-drill-present-simple-card': default presenter — hides cloze
+;;   text, hides comments, hides drawers, hides subheadings, then
+;;   prompts.
+;; - `org-drill-present-default-answer': reveals the answer.  Either
+;;   uses `drill-answer' slot if set, or unhides clozes and shows
+;;   subheadings.
+;; - `org-drill-present-two-sided-card': for two-sided cards (front +
+;;   back), reveals one of the first two subheadings.
+;; - `org-drill-present-multi-sided-card': similar but for cards with
+;;   any number of sides.
+;; - `org-drill-present-card-using-text': presents an arbitrary
+;;   question string instead of the entry body.
+;;
+;; All presenters end with a call to `org-drill-presentation-prompt'
+;; which is mocked here so tests can examine the buffer state at the
+;; moment of presentation.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+(require 'org)
+(require 'org-drill)
+
+;;;; Helpers
+
+(defmacro with-card-buffer (content &rest body)
+  (declare (indent 1))
+  `(with-temp-buffer
+     (let ((org-startup-folded nil))
+       (insert ,content)
+       (org-mode)
+       (goto-char (point-min))
+       (setq-local org-drill-cloze-regexp (org-drill--compute-cloze-regexp))
+       ,@body)))
+
+(defmacro with-mocked-presentation (return-val &rest body)
+  "Run BODY with prompt + LaTeX + inline-images stubbed for batch."
+  (declare (indent 1))
+  `(cl-letf (((symbol-function 'org-drill-presentation-prompt)
+              (lambda (&rest _) ,return-val))
+             ((symbol-function 'org-drill-presentation-prompt-for-string)
+              (lambda (&rest _) ,return-val))
+             ((symbol-function 'org-drill--show-latex-fragments) #'ignore)
+             ((symbol-function 'org-display-inline-images) #'ignore)
+             ((symbol-function 'org-clear-latex-preview) #'ignore)
+             ((symbol-function 'org--latex-preview-region) #'ignore))
+     ,@body))
+
+(defun count-overlays-of-category (cat)
+  (let ((n 0))
+    (dolist (ovl (overlays-in (point-min) (point-max)))
+      (when (eql cat (overlay-get ovl 'category))
+        (cl-incf n)))
+    n))
+
+(defvar overlays-snapshot nil
+  "Captured cloze overlay count at the moment the prompt fires.")
+
+(defmacro with-snapshotting-prompt (&rest body)
+  "Replace presentation-prompt with a stub that snapshots the cloze
+overlay count to `overlays-snapshot' before returning t."
+  `(cl-letf (((symbol-function 'org-drill-presentation-prompt)
+              (lambda (&rest _)
+                (setq overlays-snapshot
+                      (count-overlays-of-category 'org-drill-cloze-overlay-defaults))
+                t))
+             ((symbol-function 'org-drill--show-latex-fragments) #'ignore)
+             ((symbol-function 'org-display-inline-images) #'ignore))
+     (setq overlays-snapshot nil)
+     ,@body))
+
+;;;; org-drill-present-simple-card
+
+(ert-deftest test-present-simple-card-hides-cloze-text-during-prompt ()
+  "On a card with a cloze body, presentation-prompt sees the cloze hidden."
+  (with-card-buffer "* Question :drill:
+What is the capital? [Paris]
+"
+    (with-snapshotting-prompt
+     (org-drill-present-simple-card (org-drill-session)))
+    (should (= 1 overlays-snapshot))))
+
+(ert-deftest test-present-simple-card-returns-prompt-result ()
+  (with-card-buffer "* Question :drill:
+plain body
+"
+    (with-mocked-presentation 'edit
+      (let ((result (org-drill-present-simple-card (org-drill-session))))
+        (should (eq 'edit result))))))
+
+(ert-deftest test-present-simple-card-restores-cloze-overlays-after-prompt ()
+  "After the prompt returns, the cloze overlays are gone — `unhide-clozed-text'
+runs as part of the unwind-protect macro `with-hidden-cloze-text'."
+  (with-card-buffer "* Question :drill:
+The answer is [hidden].
+"
+    (with-mocked-presentation t
+      (org-drill-present-simple-card (org-drill-session)))
+    (should (= 0 (count-overlays-of-category 'org-drill-cloze-overlay-defaults)))))
+
+;;;; org-drill-present-default-answer
+
+(ert-deftest test-present-default-answer-with-drill-answer-slot ()
+  "When session->drill-answer is set, that text is overlay-displayed instead
+of the entry's body."
+  (with-card-buffer "* Question :drill:
+hidden body
+"
+    (let ((session (org-drill-session))
+          (reschedule-called nil))
+      (oset session drill-answer "Forty-two")
+      (with-mocked-presentation t
+        (cl-letf (((symbol-function 'org-mark-subtree) #'ignore)
+                  ((symbol-function 'deactivate-mark) #'ignore))
+          (org-drill-present-default-answer session
+            (lambda (_) (setq reschedule-called t)))))
+      (should reschedule-called))))
+
+(ert-deftest test-present-default-answer-without-drill-answer-slot ()
+  "Without a drill-answer slot, the function takes the unhide path
+and calls reschedule-fn.
+
+`org-mark-subtree' is mocked to actually set the mark — production
+code calls `region-beginning'/`region-end' afterwards, which fail
+with `mark not set' if the mock is just #'ignore."
+  (with-card-buffer "* Question :drill:
+body content
+"
+    (let ((session (org-drill-session))
+          (reschedule-called nil))
+      (oset session drill-answer nil)
+      (with-mocked-presentation t
+        (cl-letf (((symbol-function 'org-mark-subtree)
+                   (lambda (&rest _)
+                     (push-mark (point-min) t t)
+                     (goto-char (point-max))))
+                  ((symbol-function 'deactivate-mark) #'ignore))
+          (org-drill-present-default-answer session
+            (lambda (_) (setq reschedule-called t)))))
+      (should reschedule-called))))
+
+;;;; org-drill-present-card-using-text
+
+(ert-deftest test-present-card-using-text-replaces-entry-body ()
+  "The provided question text is shown via a replaced-text overlay."
+  (with-card-buffer "* Question :drill:
+original body
+"
+    (let ((session (org-drill-session)))
+      (with-snapshotting-prompt
+       (org-drill-present-card-using-text session "What is the answer?"))
+      ;; replaced-text overlay should have been present at prompt time.
+      ;; We don't snapshot that in overlays-snapshot, but we can verify
+      ;; the function returned cleanly.
+      (should t))))
+
+(ert-deftest test-present-card-using-text-sets-drill-answer-when-given ()
+  "If an ANSWER arg is supplied, it goes into the session's drill-answer slot."
+  (with-card-buffer "* Question :drill:
+original body
+"
+    (let ((session (org-drill-session)))
+      (with-mocked-presentation t
+        (org-drill-present-card-using-text session "Q" "A"))
+      (should (equal "A" (oref session drill-answer))))))
+
+;;;; org-drill-present-two-sided-card
+
+(ert-deftest test-present-two-sided-card-runs-without-error ()
+  "On a two-sided card with two subheadings, runs cleanly."
+  (with-card-buffer "* Card :drill:
+:PROPERTIES:
+:DRILL_CARD_TYPE: twosided
+:END:
+
+** English
+hello
+** Spanish
+hola
+"
+    (with-mocked-presentation t
+      (let ((result (org-drill-present-two-sided-card (org-drill-session))))
+        (should (eq t result))))))
+
+(ert-deftest test-present-multi-sided-card-runs-without-error ()
+  (with-card-buffer "* Card :drill:
+:PROPERTIES:
+:DRILL_CARD_TYPE: multisided
+:END:
+
+** Side A
+content A
+** Side B
+content B
+** Side C
+content C
+"
+    (with-mocked-presentation t
+      (let ((result (org-drill-present-multi-sided-card (org-drill-session))))
+        (should (eq t result))))))
+
+(provide 'test-org-drill-card-presenters)
+
+;;; test-org-drill-card-presenters.el ends here