1 files changed, 58 insertions, 0 deletions
diff --git a/internal/tui/reader_test.go b/internal/tui/reader_test.go
index 904836e..9d324ba 100644
--- a/internal/tui/reader_test.go
+++ b/internal/tui/reader_test.go
@@ -165,6 +165,64 @@ func TestReaderBookmarkFlow(t *testing.T) {
 	}
 }
 
+func TestReaderChapterJump(t *testing.T) {
+	m := enReader(t)
+	m = win(m, 80, 24)
+	m = key(m, runes("jn"))
+	m = key(m, tea.KeyMsg{Type: tea.KeyEnter}) // open John 1 (21 chapters)
+	if m.mode != modeRead {
+		t.Fatal("did not enter reading")
+	}
+	// c opens the jump prompt
+	m = key(m, runes("c"))
+	if m.mode != modeChapterJump {
+		t.Fatalf("c did not open the chapter-jump prompt (mode=%v)", m.mode)
+	}
+	if hi := m.chapters[len(m.chapters)-1]; hi != 21 {
+		t.Fatalf("John should have 21 chapters, got %d", hi)
+	}
+	if v := m.View(); !strings.Contains(v, "1-21") || !strings.Contains(v, "go to chapter") {
+		t.Errorf("jump prompt missing range/label:\n%s", v)
+	}
+	// non-digit keys are ignored; only digits accumulate
+	m = key(m, runes("x1"))
+	m = key(m, runes("4"))
+	if m.chapJumpBuf != "14" {
+		t.Fatalf("buffer = %q want 14 (non-digits filtered)", m.chapJumpBuf)
+	}
+	m = key(m, tea.KeyMsg{Type: tea.KeyBackspace})
+	m = key(m, runes("2")) // -> "12"
+	m = key(m, tea.KeyMsg{Type: tea.KeyEnter})
+	if m.mode != modeRead {
+		t.Fatalf("enter did not return to reading (mode=%v)", m.mode)
+	}
+	if m.currentChapter() != 12 {
+		t.Errorf("jumped to chapter %d want 12", m.currentChapter())
+	}
+	if m.scroll != 0 {
+		t.Errorf("jump should reset scroll, got %d", m.scroll)
+	}
+
+	// out-of-range clamps to the last chapter
+	m = key(m, runes("c"))
+	m = key(m, runes("999"))
+	m = key(m, tea.KeyMsg{Type: tea.KeyEnter})
+	if m.currentChapter() != 21 {
+		t.Errorf("999 should clamp to 21, got %d", m.currentChapter())
+	}
+
+	// esc cancels without moving
+	m = key(m, runes("c"))
+	m = key(m, runes("3"))
+	m = key(m, tea.KeyMsg{Type: tea.KeyEsc})
+	if m.mode != modeRead {
+		t.Fatalf("esc did not return to reading (mode=%v)", m.mode)
+	}
+	if m.currentChapter() != 21 {
+		t.Errorf("esc changed chapter to %d want 21", m.currentChapter())
+	}
+}
+
 func TestReaderRemembersPlace(t *testing.T) {
 	dir := t.TempDir()
 	t.Setenv("XDG_DATA_HOME", dir)