From c2b5e6f67cafbd048449fbd9aa4a0e8d2f40fc60 Mon Sep 17 00:00:00 2001
From: Hayden Hargreaves <hhargreaves2006@gmail.com>
Date: Thu, 12 Feb 2026 17:36:07 -0700
Subject: [PATCH] tests: implement tests for insert mode arrows keys

---
 internal/editor/integration_insert_test.go | 129 +++++++++++++++++++++
 1 file changed, 129 insertions(+)

diff --git a/internal/editor/integration_insert_test.go b/internal/editor/integration_insert_test.go
index 9ae65d8..ec4c4ca 100644
--- a/internal/editor/integration_insert_test.go
+++ b/internal/editor/integration_insert_test.go
@@ -457,6 +457,135 @@ func TestInsertModeDelete(t *testing.T) {
 
 }
 
+func TestInsertModeArrowKeys(t *testing.T) {
+	t.Run("test left arrow moves cursor left", func(t *testing.T) {
+		lines := []string{"hello"}
+		tm := newTestModelWithLinesAndCursorPos(t, lines, action.Position{Col: 3, Line: 0})
+		sendKeys(tm, "i", "left", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[0] != "heXllo" {
+			t.Errorf("lines[0] = %q, want 'heXllo'", m.lines[0])
+		}
+	})
+
+	t.Run("test right arrow moves cursor right", func(t *testing.T) {
+		lines := []string{"hello"}
+		tm := newTestModelWithLinesAndCursorPos(t, lines, action.Position{Col: 1, Line: 0})
+		sendKeys(tm, "i", "right", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[0] != "heXllo" {
+			t.Errorf("lines[0] = %q, want 'heXllo'", m.lines[0])
+		}
+	})
+
+	t.Run("test up arrow moves cursor up", func(t *testing.T) {
+		lines := []string{"hello", "world"}
+		tm := newTestModelWithLinesAndCursorPos(t, lines, action.Position{Col: 2, Line: 1})
+		sendKeys(tm, "i", "up", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[0] != "heXllo" {
+			t.Errorf("lines[0] = %q, want 'heXllo'", m.lines[0])
+		}
+		if m.lines[1] != "world" {
+			t.Errorf("lines[1] = %q, want 'world'", m.lines[1])
+		}
+	})
+
+	t.Run("test down arrow moves cursor down", func(t *testing.T) {
+		lines := []string{"hello", "world"}
+		tm := newTestModelWithLinesAndCursorPos(t, lines, action.Position{Col: 2, Line: 0})
+		sendKeys(tm, "i", "down", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[0] != "hello" {
+			t.Errorf("lines[0] = %q, want 'hello'", m.lines[0])
+		}
+		if m.lines[1] != "woXrld" {
+			t.Errorf("lines[1] = %q, want 'woXrld'", m.lines[1])
+		}
+	})
+
+	t.Run("test left arrow at start of line does nothing", func(t *testing.T) {
+		lines := []string{"hello"}
+		tm := newTestModelWithLines(t, lines)
+		sendKeys(tm, "i", "left", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[0] != "Xhello" {
+			t.Errorf("lines[0] = %q, want 'Xhello'", m.lines[0])
+		}
+	})
+
+	t.Run("test right arrow at end of line does nothing", func(t *testing.T) {
+		lines := []string{"hello"}
+		tm := newTestModelWithLinesAndCursorPos(t, lines, action.Position{Col: 4, Line: 0})
+		sendKeys(tm, "a", "right", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[0] != "helloX" {
+			t.Errorf("lines[0] = %q, want 'helloX'", m.lines[0])
+		}
+	})
+
+	t.Run("test up arrow at first line does nothing", func(t *testing.T) {
+		lines := []string{"hello"}
+		tm := newTestModelWithLinesAndCursorPos(t, lines, action.Position{Col: 2, Line: 0})
+		sendKeys(tm, "i", "up", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[0] != "heXllo" {
+			t.Errorf("lines[0] = %q, want 'heXllo'", m.lines[0])
+		}
+	})
+
+	t.Run("test down arrow at last line does nothing", func(t *testing.T) {
+		lines := []string{"hello"}
+		tm := newTestModelWithLinesAndCursorPos(t, lines, action.Position{Col: 2, Line: 0})
+		sendKeys(tm, "i", "down", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[0] != "heXllo" {
+			t.Errorf("lines[0] = %q, want 'heXllo'", m.lines[0])
+		}
+	})
+
+	t.Run("test up arrow clamps cursor to shorter line", func(t *testing.T) {
+		lines := []string{"hi", "hello"}
+		tm := newTestModelWithLinesAndCursorPos(t, lines, action.Position{Col: 4, Line: 1})
+		sendKeys(tm, "i", "up", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[0] != "hiX" {
+			t.Errorf("lines[0] = %q, want 'hiX'", m.lines[0])
+		}
+	})
+
+	t.Run("test down arrow clamps cursor to shorter line", func(t *testing.T) {
+		lines := []string{"hello", "hi"}
+		tm := newTestModelWithLinesAndCursorPos(t, lines, action.Position{Col: 4, Line: 0})
+		sendKeys(tm, "i", "down", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[1] != "hiX" {
+			t.Errorf("lines[1] = %q, want 'hiX'", m.lines[1])
+		}
+	})
+
+	t.Run("test multiple arrow keys in sequence", func(t *testing.T) {
+		lines := []string{"hello", "world"}
+		tm := newTestModelWithLines(t, lines)
+		sendKeys(tm, "i", "right", "right", "down", "X", "esc")
+
+		m := getFinalModel(t, tm)
+		if m.lines[1] != "woXrld" {
+			t.Errorf("lines[1] = %q, want 'woXrld'", m.lines[1])
+		}
+	})
+}
+
 func TestInsertModeDeletePreviousWord(t *testing.T) {
 	t.Run("test 'ctrl+w' deletes word", func(t *testing.T) {
 		lines := []string{"hello world"}