1 files changed, 51 insertions, 0 deletions
diff --git a/tests/resize_failure_test.c b/tests/resize_failure_test.c
index 5d7e63c..fbfa38d 100644
--- a/tests/resize_failure_test.c
+++ b/tests/resize_failure_test.c
@@ -146,6 +146,57 @@ int main(void)
     assert(tt_cols(term) == 10);
     term_free(term);
 
+    /* A failed same-width height shrink must not scroll rows into history or
+     * move the cursor. The same resize must succeed when allocation recovers. */
+    term = tt_new(8, 4);
+    assert(term);
+    const char four_rows[] = "A\r\nB\r\nC\r\nD";
+    tt_write(term, four_rows, sizeof four_rows - 1);
+    assert(tt_cursor_y(term) == 3);
+    assert(tt_history(term) == 0);
+
+    fail_next_calloc = true;
+    resized = tt_resize(term, 8, 2);
+    assert(!fail_next_calloc);
+    assert(!resized);
+    assert(tt_cols(term) == 8 && tt_rows(term) == 4);
+    assert(tt_cell(term, 0, 0)->text == 'A');
+    assert(tt_cell(term, 0, 1)->text == 'B');
+    assert(tt_cell(term, 0, 2)->text == 'C');
+    assert(tt_cell(term, 0, 3)->text == 'D');
+    assert(tt_cursor_y(term) == 3);
+    assert(tt_history(term) == 0);
+
+    resized = tt_resize(term, 8, 2);
+    assert(resized);
+    assert(tt_cols(term) == 8 && tt_rows(term) == 2);
+    assert(tt_cell(term, 0, 0)->text == 'C');
+    assert(tt_cell(term, 0, 1)->text == 'D');
+    assert(tt_cursor_y(term) == 1);
+    assert(tt_history(term) == 2);
+    term_free(term);
+
+    /* The alternate screen uses the same allocation-before-scroll path. */
+    term = tt_new(8, 4);
+    assert(term);
+    tt_write(term, "\033[?1049h", 8);
+    tt_write(term, four_rows, sizeof four_rows - 1);
+    assert(term_modes(term).alternate);
+    assert(tt_cursor_y(term) == 3);
+    fail_next_calloc = true;
+    resized = tt_resize(term, 8, 2);
+    assert(!fail_next_calloc);
+    assert(!resized);
+    assert(tt_rows(term) == 4 && tt_cursor_y(term) == 3);
+    assert(tt_cell(term, 0, 0)->text == 'A');
+    assert(tt_cell(term, 0, 3)->text == 'D');
+    resized = tt_resize(term, 8, 2);
+    assert(resized);
+    assert(tt_rows(term) == 2 && tt_cursor_y(term) == 1);
+    assert(tt_cell(term, 0, 0)->text == 'C');
+    assert(tt_cell(term, 0, 1)->text == 'D');
+    term_free(term);
+
     puts("lazy screen allocation failures preserve observable terminal state");
     return 0;
 #endif