diff --git a/.pql/pql-plan.json b/.pql/pql-plan.json
index 8b1f8394..ae81e1af 100644
--- a/.pql/pql-plan.json
+++ b/.pql/pql-plan.json
@@ -1,5 +1,5 @@
 {
-  "exported_at": "2026-05-06T21:51:46Z",
+  "exported_at": "2026-05-06T22:03:19Z",
   "decisions": [
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@@ -9,7 +9,7 @@
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@@ -19,7 +19,7 @@
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@@ -29,7 +29,7 @@
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@@ -39,7 +39,7 @@
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@@ -49,7 +49,7 @@
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@@ -59,7 +59,7 @@
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@@ -69,7 +69,7 @@
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@@ -79,7 +79,7 @@
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@@ -89,7 +89,7 @@
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@@ -99,7 +99,7 @@
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@@ -109,7 +109,7 @@
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@@ -119,7 +119,7 @@
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@@ -129,7 +129,7 @@
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@@ -139,7 +139,7 @@
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@@ -149,7 +149,7 @@
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@@ -159,7 +159,7 @@
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@@ -169,7 +169,7 @@
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@@ -179,7 +179,7 @@
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@@ -189,7 +189,7 @@
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@@ -199,7 +199,7 @@
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@@ -209,7 +209,7 @@
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@@ -219,7 +219,7 @@
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@@ -229,7 +229,7 @@
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@@ -239,7 +239,7 @@
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@@ -249,7 +249,7 @@
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@@ -259,7 +259,7 @@
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@@ -269,7 +269,7 @@
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@@ -279,7 +279,7 @@
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@@ -289,7 +289,7 @@
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@@ -299,7 +299,7 @@
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@@ -309,7 +309,7 @@
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@@ -319,7 +319,7 @@
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@@ -329,7 +329,7 @@
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@@ -339,7 +339,7 @@
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@@ -349,7 +349,7 @@
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@@ -359,7 +359,7 @@
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@@ -369,7 +369,7 @@
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@@ -379,7 +379,7 @@
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@@ -389,7 +389,7 @@
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@@ -399,7 +399,7 @@
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@@ -409,7 +409,7 @@
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@@ -419,7 +419,7 @@
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@@ -429,7 +429,7 @@
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@@ -439,7 +439,7 @@
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@@ -449,7 +449,7 @@
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@@ -459,7 +459,7 @@
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@@ -469,7 +469,7 @@
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@@ -479,7 +479,7 @@
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@@ -489,7 +489,7 @@
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@@ -499,7 +499,7 @@
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@@ -509,7 +509,7 @@
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@@ -519,7 +519,7 @@
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@@ -529,7 +529,7 @@
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@@ -539,7 +539,7 @@
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@@ -549,7 +549,7 @@
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@@ -559,7 +559,7 @@
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@@ -569,7 +569,7 @@
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@@ -579,7 +579,7 @@
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@@ -589,7 +589,7 @@
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@@ -599,7 +599,7 @@
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@@ -609,7 +609,7 @@
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@@ -619,7 +619,7 @@
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@@ -629,7 +629,7 @@
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@@ -639,7 +639,7 @@
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@@ -649,7 +649,7 @@
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@@ -658,7 +658,7 @@
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-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
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@@ -667,7 +667,7 @@
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-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
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@@ -676,7 +676,7 @@
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-      "synced_at": "2026-05-06 21:51:08"
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@@ -685,7 +685,7 @@
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       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-5",
@@ -694,7 +694,7 @@
       "title": "IPC wire-format stability + `schema_version:`",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-6",
@@ -703,7 +703,7 @@
       "title": "Window chrome — native frame vs frameless custom",
       "status": "resolved",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-7",
@@ -712,7 +712,7 @@
       "title": "macOS app bundle signing / notarisation",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-8",
@@ -721,7 +721,7 @@
       "title": "Extension API shape — widgets, subcommands, both?",
       "status": "open",
       "file_path": "decisions/questions-extensions.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-9",
@@ -730,7 +730,7 @@
       "title": "Lua runtime vendoring",
       "status": "open",
       "file_path": "decisions/questions-extensions.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-10",
@@ -739,7 +739,7 @@
       "title": "Extension manifest `schema_version:`",
       "status": "open",
       "file_path": "decisions/questions-extensions.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-11",
@@ -748,7 +748,7 @@
       "title": "Coverage gates — hard thresholds vs soft reporting",
       "status": "open",
       "file_path": "decisions/questions-testing.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-12",
@@ -757,7 +757,7 @@
       "title": "Screen-reader automation (axe-core via Playwright)",
       "status": "open",
       "file_path": "decisions/questions-testing.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-13",
@@ -766,7 +766,7 @@
       "title": "Web production-mode a11y",
       "status": "open",
       "file_path": "decisions/questions-accessibility.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-14",
@@ -775,7 +775,7 @@
       "title": "i18n plurals / gender / date-format tooling",
       "status": "open",
       "file_path": "decisions/questions-accessibility.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-15",
@@ -784,7 +784,7 @@
       "title": "Editor tab — full LSP vs tree-sitter-only highlight",
       "status": "open",
       "file_path": "decisions/questions-process.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-16",
@@ -793,7 +793,7 @@
       "title": "`tree-sitter-dart` grammar maintenance",
       "status": "open",
       "file_path": "decisions/questions-process.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-17",
@@ -802,7 +802,7 @@
       "title": "Icon set growth",
       "status": "open",
       "file_path": "decisions/questions-process.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-18",
@@ -811,7 +811,7 @@
       "title": "Theme hot-reload in release builds",
       "status": "open",
       "file_path": "decisions/questions-process.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-19",
@@ -820,7 +820,7 @@
       "title": "(withdrawn)",
       "status": "resolved",
       "file_path": "decisions/questions-process.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-20",
@@ -829,7 +829,7 @@
       "title": "Kernel DB service — namespaced SQL access?",
       "status": "open",
       "file_path": "decisions/questions-process.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-21",
@@ -838,7 +838,7 @@
       "title": "Pql absorbs planning vs keeps separate",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-22",
@@ -847,7 +847,7 @@
       "title": "Ticket persistence strategy",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-23",
@@ -856,7 +856,7 @@
       "title": "SSH-remote development — run clide against a remote workspace",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-25",
@@ -865,7 +865,7 @@
       "title": "Body text face — mono everywhere vs Josefin Sans UI + mono code",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-26",
@@ -874,7 +874,7 @@
       "title": "Small screen layout (\u003c 1000px)",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-27",
@@ -883,7 +883,7 @@
       "title": "Two-editor split",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-28",
@@ -892,7 +892,7 @@
       "title": "Terminal strip scope — shell only or logs/errors/tests",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-29",
@@ -901,7 +901,7 @@
       "title": "Branch picker location",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-30",
@@ -910,7 +910,7 @@
       "title": "Focus behavior when editor is dirty and viewer is peeked",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "Q-31",
@@ -919,7 +919,7 @@
       "title": "XWayland fallback for frameless — proper Wayland protocol needed",
       "status": "open",
       "file_path": "decisions/questions-architecture.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-2",
@@ -929,7 +929,7 @@
       "status": "active",
       "date": "2026-04-20",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-3",
@@ -939,7 +939,7 @@
       "status": "active",
       "date": "2026-04-21",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-4",
@@ -949,7 +949,7 @@
       "status": "active",
       "date": "2026-04-21",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-5",
@@ -959,7 +959,7 @@
       "status": "active",
       "date": "2026-04-21",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-6",
@@ -969,7 +969,7 @@
       "status": "active",
       "date": "2026-04-21",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-7",
@@ -979,7 +979,7 @@
       "status": "active",
       "date": "2026-04-21",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-8",
@@ -989,7 +989,7 @@
       "status": "active",
       "date": "2026-04-21",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-9",
@@ -999,7 +999,7 @@
       "status": "active",
       "date": "2026-04-21",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-10",
@@ -1009,7 +1009,7 @@
       "status": "active",
       "date": "2026-04-21",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-11",
@@ -1019,7 +1019,7 @@
       "status": "active",
       "date": "2026-04-21",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     },
     {
       "id": "R-12",
@@ -1029,7 +1029,7 @@
       "status": "active",
       "date": "2026-04-22",
       "file_path": "decisions/rejected.md",
-      "synced_at": "2026-05-06 21:51:08"
+      "synced_at": "2026-05-06 22:01:32"
     }
   ],
   "decision_refs": [
diff --git a/lib/src/terminal/src/core/cursor.dart b/lib/src/terminal/src/core/cursor.dart
index e06c980b..741f3d67 100644
--- a/lib/src/terminal/src/core/cursor.dart
+++ b/lib/src/terminal/src/core/cursor.dart
@@ -81,7 +81,7 @@ class CursorStyle {
 
   bool get isFaint => (attrs & CellAttr.faint) != 0;
 
-  bool get isItalis => (attrs & CellAttr.italic) != 0;
+  bool get isItalic => (attrs & CellAttr.italic) != 0;
 
   bool get isUnderline => (attrs & CellAttr.underline) != 0;
 
diff --git a/lib/src/terminal/src/core/reflow.dart b/lib/src/terminal/src/core/reflow.dart
index 05451458..4812e8bb 100644
--- a/lib/src/terminal/src/core/reflow.dart
+++ b/lib/src/terminal/src/core/reflow.dart
@@ -16,8 +16,6 @@ class _LineBuilder {
 
   int get length => _length;
 
-  bool get isEmpty => _length == 0;
-
   bool get isNotEmpty => _length != 0;
 
   /// Adds a range of cells from [src] to the builder. Anchors within the range
diff --git a/pubspec.yaml b/pubspec.yaml
index 2bd5f6da..1750723c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -18,7 +18,7 @@ repository: https://github.com/postmeridiem/clide
 
 # Pre-push line-coverage floor. Ratchets up only — see D-66.
 # Reading: `awk -F: '/^coverage_floor:/ {gsub(/ /,"",$2); print $2}' pubspec.yaml`.
-coverage_floor: 52
+coverage_floor: 54
 
 # Project metadata (was project.yaml, folded in per D-056).
 # version: above is the single source of truth. The Makefile reads
diff --git a/test/terminal/core/core_test.dart b/test/terminal/core/core_test.dart
new file mode 100644
index 00000000..f67c9b92
--- /dev/null
+++ b/test/terminal/core/core_test.dart
@@ -0,0 +1,408 @@
+/// Pure-Dart tests for the small `lib/src/terminal/src/core/*.dart`
+/// files — cell, cursor, charset, tabs, reflow.
+library;
+
+import 'package:clide/src/terminal/src/core/buffer/line.dart';
+import 'package:clide/src/terminal/src/core/cell.dart';
+import 'package:clide/src/terminal/src/core/charset.dart';
+import 'package:clide/src/terminal/src/core/cursor.dart';
+import 'package:clide/src/terminal/src/core/reflow.dart';
+import 'package:clide/src/terminal/src/core/tabs.dart';
+import 'package:clide/src/terminal/src/utils/circular_buffer.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('CellData', () {
+    test('explicit constructor stores all four channels', () {
+      final c = CellData(foreground: 1, background: 2, flags: 4, content: 8);
+      expect(c.foreground, 1);
+      expect(c.background, 2);
+      expect(c.flags, 4);
+      expect(c.content, 8);
+    });
+
+    test('CellData.empty factory zeroes everything', () {
+      final c = CellData.empty();
+      expect(c.foreground, 0);
+      expect(c.background, 0);
+      expect(c.flags, 0);
+      expect(c.content, 0);
+    });
+
+    test('getHash combines all four channels (different inputs → different hash)', () {
+      final a = CellData(foreground: 1, background: 2, flags: 3, content: 4);
+      final b = CellData(foreground: 1, background: 2, flags: 3, content: 4);
+      expect(a.getHash(), b.getHash());
+      final c = CellData(foreground: 1, background: 2, flags: 3, content: 5);
+      expect(a.getHash(), isNot(c.getHash()));
+    });
+
+    test('toString shape is the documented debug format', () {
+      final c = CellData(foreground: 1, background: 2, flags: 4, content: 8);
+      expect(
+        c.toString(),
+        'CellData{foreground: 1, background: 2, flags: 4, content: 8}',
+      );
+    });
+  });
+
+  group('CursorStyle', () {
+    test('default constructor zeroes all three fields', () {
+      final c = CursorStyle();
+      expect(c.foreground, 0);
+      expect(c.background, 0);
+      expect(c.attrs, 0);
+    });
+
+    test('every set / unset attr toggles the right CellAttr bit', () {
+      final c = CursorStyle();
+      // Pair each setter with its corresponding getter and unsetter.
+      final cases = <(void Function(), void Function(), bool Function())>[
+        (c.setBold, c.unsetBold, () => c.isBold),
+        (c.setFaint, c.unsetFaint, () => c.isFaint),
+        (c.setItalic, c.unsetItalic, () => c.isItalic),
+        (c.setUnderline, c.unsetUnderline, () => c.isUnderline),
+        (c.setBlink, c.unsetBlink, () => c.isBlink),
+        (c.setInverse, c.unsetInverse, () => c.isInverse),
+        (c.setInvisible, c.unsetInvisible, () => c.isInvisible),
+      ];
+      for (final (set, unset, getter) in cases) {
+        c.attrs = 0;
+        expect(getter(), isFalse);
+        set();
+        expect(getter(), isTrue);
+        unset();
+        expect(getter(), isFalse);
+      }
+      // Strikethrough has no getter — exercise its set / unset directly.
+      c.attrs = 0;
+      c.setStrikethrough();
+      expect(c.attrs & CellAttr.strikethrough, isNot(0));
+      c.unsetStrikethrough();
+      expect(c.attrs & CellAttr.strikethrough, 0);
+    });
+
+    test('foreground 16 / 256 / RGB encode the right CellColor type bits', () {
+      final c = CursorStyle();
+      c.setForegroundColor16(3);
+      expect(c.foreground, 3 | CellColor.named);
+      c.setForegroundColor256(200);
+      expect(c.foreground, 200 | CellColor.palette);
+      c.setForegroundColorRgb(0x10, 0x20, 0x30);
+      expect(c.foreground, 0x10 << 16 | 0x20 << 8 | 0x30 | CellColor.rgb);
+      c.resetForegroundColor();
+      expect(c.foreground, 0);
+    });
+
+    test('background 16 / 256 / RGB encode the right CellColor type bits', () {
+      final c = CursorStyle();
+      c.setBackgroundColor16(5);
+      expect(c.background, 5 | CellColor.named);
+      c.setBackgroundColor256(123);
+      expect(c.background, 123 | CellColor.palette);
+      c.setBackgroundColorRgb(1, 2, 3);
+      expect(c.background, 1 << 16 | 2 << 8 | 3 | CellColor.rgb);
+      c.resetBackgroundColor();
+      expect(c.background, 0);
+    });
+
+    test('reset wipes all three fields', () {
+      final c = CursorStyle()
+        ..setBold()
+        ..setForegroundColor16(2)
+        ..setBackgroundColor256(99);
+      c.reset();
+      expect(c.foreground, 0);
+      expect(c.background, 0);
+      expect(c.attrs, 0);
+    });
+
+    test('CursorStyle.empty exposes a default-zero singleton', () {
+      // Don't mutate this — it's a shared singleton.
+      expect(CursorStyle.empty.foreground, 0);
+      expect(CursorStyle.empty.background, 0);
+      expect(CursorStyle.empty.attrs, 0);
+    });
+  });
+
+  group('CursorPosition', () {
+    test('exposes mutable x / y fields', () {
+      final p = CursorPosition(3, 5);
+      expect(p.x, 3);
+      expect(p.y, 5);
+      p.x = 7;
+      p.y = 9;
+      expect(p.x, 7);
+      expect(p.y, 9);
+    });
+  });
+
+  group('Charset', () {
+    test('asciiTranslator is identity', () {
+      expect(asciiTranslator(0x41), 0x41);
+      expect(asciiTranslator(0x7e), 0x7e);
+    });
+
+    test('decSpecGraphicsTranslator maps the documented codepoints', () {
+      // 0x6a → BOX DRAWINGS LIGHT UP AND LEFT (0x2518)
+      expect(decSpecGraphicsTranslator(0x6a), 0x2518);
+      // 0x71 → BOX DRAWINGS LIGHT HORIZONTAL (0x2500)
+      expect(decSpecGraphicsTranslator(0x71), 0x2500);
+    });
+
+    test('decSpecGraphicsTranslator passes unmapped low-codepoints through', () {
+      expect(decSpecGraphicsTranslator(0x41), 0x41); // 'A' is unmapped
+    });
+
+    test('decSpecGraphicsTranslator passes high codepoints through', () {
+      // The spec only maps 0x5f..0x7e; anything ≥ 127 is identity.
+      expect(decSpecGraphicsTranslator(0x100), 0x100);
+      expect(decSpecGraphicsTranslator(0x4E2D), 0x4E2D);
+    });
+
+    test('translate defaults to ascii when no charset is designated', () {
+      final c = Charset();
+      expect(c.translate(0x6a), 0x6a);
+    });
+
+    test('designate + use switch the active translator', () {
+      final c = Charset();
+      // Designate the DEC special-graphics charset at slot 0…
+      c.designate(0, '0'.codeUnitAt(0));
+      // …and select slot 0 as the active charset.
+      c.use(0);
+      expect(c.translate(0x6a), 0x2518); // now maps via DEC graphics
+      // Switch back to a slot with no designated charset → ascii fallback.
+      c.use(1);
+      expect(c.translate(0x6a), 0x6a);
+    });
+
+    test('designate ignores unknown charset names without changing state', () {
+      final c = Charset();
+      c.designate(0, 0xFFFF); // not in the _charsets table
+      c.use(0);
+      expect(c.translate(0x6a), 0x6a); // still ascii
+    });
+
+    test('save / restore round-trips both the map and the active index', () {
+      final c = Charset();
+      c.designate(0, '0'.codeUnitAt(0));
+      c.use(0);
+      c.save();
+      // Mutate after save…
+      c.designate(0, 'B'.codeUnitAt(0)); // ascii in slot 0 — translate is identity
+      c.use(1);
+      expect(c.translate(0x6a), 0x6a);
+      // …restore should reinstate the saved DEC-graphics binding.
+      c.restore();
+      expect(c.translate(0x6a), 0x2518);
+    });
+  });
+
+  group('TabStops', () {
+    test('default state has tab stops every 8 columns', () {
+      final t = TabStops();
+      for (var i = 0; i < 100; i++) {
+        expect(t.isSetAt(i), i % 8 == 0, reason: 'col $i');
+      }
+    });
+
+    test('find — returns first set stop in [start, end)', () {
+      final t = TabStops();
+      // Default: 0, 8, 16, 24, ...
+      expect(t.find(1, 20), 8);
+      expect(t.find(8, 20), 8);
+      expect(t.find(9, 16), isNull); // no stops in [9, 16)
+      expect(t.find(0, 1), 0);
+    });
+
+    test('find returns null when start >= end', () {
+      final t = TabStops();
+      expect(t.find(10, 10), isNull);
+      expect(t.find(20, 5), isNull);
+    });
+
+    test('find clamps end to the underlying array length', () {
+      final t = TabStops();
+      // 99999 > _kMaxColumns; should still return a valid stop without
+      // walking out of bounds.
+      expect(t.find(0, 99999), 0);
+    });
+
+    test('setAt + clearAt toggle individual columns', () {
+      final t = TabStops();
+      t.clearAt(8);
+      expect(t.isSetAt(8), isFalse);
+      t.setAt(3);
+      expect(t.isSetAt(3), isTrue);
+      t.clearAt(3);
+      expect(t.isSetAt(3), isFalse);
+    });
+
+    test('clearAll wipes every stop without restoring the default grid', () {
+      final t = TabStops();
+      t.clearAll();
+      for (var i = 0; i < 100; i++) {
+        expect(t.isSetAt(i), isFalse, reason: 'col $i');
+      }
+    });
+
+    test('reset clears then re-installs the default 8-column grid', () {
+      final t = TabStops();
+      t.setAt(3);
+      t.clearAt(8);
+      t.reset();
+      // 3 should no longer be set; 8 should be set again.
+      expect(t.isSetAt(3), isFalse);
+      expect(t.isSetAt(8), isTrue);
+    });
+  });
+
+  group('reflow', () {
+    BufferLine line(int width, [String? text]) {
+      final l = BufferLine(width);
+      if (text != null) {
+        for (var i = 0; i < text.length; i++) {
+          l.setCodePoint(i, text.codeUnitAt(i));
+        }
+      }
+      return l;
+    }
+
+    IndexAwareCircularBuffer<BufferLine> ring(List<BufferLine> ls) {
+      final r = IndexAwareCircularBuffer<BufferLine>(ls.length + 4);
+      for (final l in ls) {
+        r.push(l);
+      }
+      return r;
+    }
+
+    test('empty input produces empty output', () {
+      final out = reflow(ring([]), 80, 80);
+      expect(out, isEmpty);
+    });
+
+    test('single empty line is reused as-is', () {
+      final l = line(8);
+      final out = reflow(ring([l]), 8, 8);
+      expect(out.length, 1);
+      expect(identical(out.first, l), isTrue);
+    });
+
+    test('grow width keeps lines and resizes them to the new width', () {
+      final out = reflow(ring([line(4, 'abcd')]), 4, 8);
+      expect(out, hasLength(1));
+      expect(out.first.length, 8);
+      expect(out.first.getCodePoint(0), 'a'.codeUnitAt(0));
+      expect(out.first.getCodePoint(3), 'd'.codeUnitAt(0));
+    });
+
+    test('shrink width splits a single full line into wrapped pieces', () {
+      // 8 chars on a width-8 line, reflowed to width 4 → two width-4 lines.
+      final out = reflow(ring([line(8, 'abcdefgh')]), 8, 4);
+      expect(out, hasLength(2));
+      expect(out[0].getCodePoint(0), 'a'.codeUnitAt(0));
+      expect(out[0].isWrapped, isFalse); // first line of a logical run
+      expect(out[1].getCodePoint(0), 'e'.codeUnitAt(0));
+      expect(out[1].isWrapped, isTrue);
+    });
+
+    test('continues a wrapped run across input lines and re-emits wrapped output', () {
+      // Two width-4 lines forming a single logical line "abcdefgh", reflowed
+      // back to width 8 → a single line of 8 chars.
+      final a = line(4, 'abcd');
+      final b = line(4, 'efgh')..isWrapped = true;
+      final out = reflow(ring([a, b]), 4, 8);
+      expect(out, hasLength(1));
+      expect(out.first.getCodePoint(0), 'a'.codeUnitAt(0));
+      expect(out.first.getCodePoint(7), 'h'.codeUnitAt(0));
+    });
+
+    test('shrink across a wide char does not split it across two output lines', () {
+      // Layout on a width-6 input: 'ab中cd' — the wide char straddles
+      // columns 2..3. Reflow to width 4 → first line is 'ab' + space (the
+      // wide char wouldn't fit), second line carries the wide char + 'cd'.
+      final l = BufferLine(6);
+      l.setCodePoint(0, 'a'.codeUnitAt(0));
+      l.setCodePoint(1, 'b'.codeUnitAt(0));
+      l.setCodePoint(2, '中'.runes.first); // width 2 → occupies 2..3
+      l.setCodePoint(4, 'c'.codeUnitAt(0));
+      l.setCodePoint(5, 'd'.codeUnitAt(0));
+
+      final out = reflow(ring([l]), 6, 4);
+      expect(out.length, greaterThanOrEqualTo(2));
+      // First output line should not have started its last cell on the wide
+      // char's first half — i.e. cell index 3 should be empty (width-clamp
+      // branch fired during the initial fill).
+      expect(out[0].getCodePoint(3), 0);
+    });
+
+    test('shrink with a wide char at the new boundary takes the from=newWidth-1 path', () {
+      // The branch at reflow.dart:88 only fires when the cell at the new
+      // boundary (newWidth-1) is itself the first half of a wide char.
+      final l = BufferLine(6);
+      l.setCodePoint(0, 'a'.codeUnitAt(0));
+      l.setCodePoint(1, 'b'.codeUnitAt(0));
+      l.setCodePoint(2, 'c'.codeUnitAt(0));
+      l.setCodePoint(3, '中'.runes.first); // wide → straddles 3..4
+      l.setCodePoint(5, 'd'.codeUnitAt(0));
+
+      // newWidth=4 → boundary cell is 3, which is the wide char's first half.
+      final out = reflow(ring([l]), 6, 4);
+      expect(out.length, greaterThanOrEqualTo(2));
+      // The wide char should not survive as a half-cell on the first line.
+      expect(out[0].getCodePoint(3), 0);
+    });
+
+    test('anchors on the source line tail (past trimmedLength) get reparented', () {
+      // The post-loop branch in `_addPart` reparents anchors whose x sits
+      // beyond the trimmed-content range — the empty tail of an over-wide
+      // source line. The anchor moves off the source onto whichever
+      // builder line was active at the time, regardless of whether that
+      // builder line ends up emitted — so the only contract we can rely
+      // on is that the anchor no longer points to the source.
+      final src = line(12, 'abcdefgh'); // width 12, content 8
+      final tail = src.createAnchor(10); // past trimmedLength (8)
+      reflow(ring([src]), 12, 4);
+      expect(tail.line, isNot(equals(src)));
+    });
+
+    test('inner wide-char clamp during _addPart leaves the wide cell to the next iteration', () {
+      // The clamp at reflow.dart:124 fires when the iteration is about to
+      // fill the builder AND the last cell would be the first half of a
+      // wide char — _addPart pushes that copy to the next iteration.
+      final src = BufferLine(9);
+      for (var i = 0; i < 7; i++) {
+        src.setCodePoint(i, 'a'.codeUnitAt(0) + i);
+      }
+      // Set wide at index 7 (straddles 7..8).
+      src.setCodePoint(7, '中'.runes.first);
+      final out = reflow(ring([src]), 9, 4);
+      expect(out.length, greaterThanOrEqualTo(2));
+    });
+
+    test('anchors on the source line get reparented to the reflowed output', () {
+      // CellAnchor.attached delegates to its owning BufferLine.attached
+      // (which itself reflects whether the line sits in an
+      // IndexAwareCircularBuffer). Reflow returns a plain List, so the
+      // output lines aren't "attached" — but anchors should still point
+      // to one of the lines in the result.
+      final src = line(8, 'abcdefgh');
+      final anchorAtStart = src.createAnchor(0);
+      final anchorMid = src.createAnchor(5);
+      final out = reflow(ring([src]), 8, 4);
+      expect(out, hasLength(2));
+
+      // anchorAtStart was at x=0 on the original line; reflow's first
+      // step is `_lines.add(line)`, so the original line is the first
+      // output. The anchor should still point to that same instance.
+      expect(out.contains(anchorAtStart.line), isTrue);
+
+      // anchorMid was at x=5; the [4..8) tail is split out via _addPart
+      // and lands on the second output line, with the anchor reparented
+      // there.
+      expect(out.contains(anchorMid.line), isTrue);
+      expect(anchorMid.line, isNot(equals(anchorAtStart.line)));
+    });
+  });
+}