test: cover the org-drill main entry and hypothetical-next-review-date dispatch

I added tests for the public `org-drill' command that mock
`org-drill-entries' so the orchestrator runs in batch: empty buffer →
'no pending' message, populated buffer → entry loop runs, cram=t flag
flips the session's cram-mode slot, resume-p skips entry collection.
I also extended the cloze + scheduling helpers file with sm2 and
simple8 coverage for `org-drill-hypothetical-next-review-date'.

Coverage moved from 89.0% to 89.8%.

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/test-org-drill-cloze-and-scheduling-helpers.el b/tests/test-org-drill-cloze-and-scheduling-helpers.el
index ba6503c..1ee4c61 100644
--- a/tests/test-org-drill-cloze-and-scheduling-helpers.el
+++ b/tests/test-org-drill-cloze-and-scheduling-helpers.el
@@ -115,6 +115,22 @@ symbol itself."
     (should (equal 0 (org-drill-hypothetical-next-review-date 1)))
     (should (equal 0 (org-drill-hypothetical-next-review-date 2)))))
 
+(ert-deftest test-org-drill-hypothetical-next-review-date-sm2-algorithm ()
+  "With sm2 selected, hypothetical-next-review-date returns a positive number."
+  (with-fresh-drill-entry
+    (let ((org-drill-spaced-repetition-algorithm 'sm2))
+      (let ((days (org-drill-hypothetical-next-review-date 5)))
+        (should (numberp days))
+        (should (>= days 0))))))
+
+(ert-deftest test-org-drill-hypothetical-next-review-date-simple8-algorithm ()
+  "With simple8 selected, hypothetical-next-review-date returns a positive number."
+  (with-fresh-drill-entry
+    (let ((org-drill-spaced-repetition-algorithm 'simple8))
+      (let ((days (org-drill-hypothetical-next-review-date 5)))
+        (should (numberp days))
+        (should (>= days 0))))))
+
 (ert-deftest test-org-drill-hypothetical-next-review-date-quality-monotonic ()
   "Higher quality means longer next-interval — the curve should be monotonic
 non-decreasing across q=3 → q=5 on a virgin card."