@@ -44,9 +44,7 @@ def materialize_with_truncation(lines: Iterable[str], config: Config) -> list[st
     # Pull one line past the point where ``_truncate_explanation`` keeps the
     # body whole (``max_lines + TRUNCATION_FOOTER_LINES``) so it can detect the
     # overflow, without us materialising more than we need.
-    line_cap = (
-        max_lines + TRUNCATION_FOOTER_LINES + 1 if max_lines > 0 else None
-    )
+    line_cap = max_lines + TRUNCATION_FOOTER_LINES + 1 if max_lines > 0 else None
     buffered: list[str] = []
     char_count = 0
     for line in lines:
 
@@ -506,7 +506,12 @@ def test_text_diff_budget_caps_ndiff_input(self) -> None:
         ndiff_style = util.ASSERTION_TEXT_DIFF_STYLE_NDIFF
         capped = list(
             _compare_eq_text(
-                left, right, util.dummy_highlighter, 1, ndiff_style, TruncationBudget(11, 710)
+                left,
+                right,
+                util.dummy_highlighter,
+                1,
+                ndiff_style,
+                TruncationBudget(11, 710),
             )
         )
         full = list(
Original file line number	Diff line number	Diff line change
`@@ -506,7 +506,12 @@ def test_text_diff_budget_caps_ndiff_input(self) -> None:`
`506`	`506`	`ndiff_style = util.ASSERTION_TEXT_DIFF_STYLE_NDIFF`
`507`	`507`	`capped = list(`
`508`	`508`	`_compare_eq_text(`
`509`		`- left, right, util.dummy_highlighter, 1, ndiff_style, TruncationBudget(11, 710)`
	`509`	`+ left,`
	`510`	`+ right,`
	`511`	`+ util.dummy_highlighter,`
	`512`	`+ 1,`
	`513`	`+ ndiff_style,`
	`514`	`+ TruncationBudget(11, 710),`
`510`	`515`	`)`
`511`	`516`	`)`
`512`	`517`	`full = list(`