test(panelprinter): add tests for adding box printer

docs/docs/printer/panel.md

@@ -39,6 +39,7 @@ _ = pterm.DefaultPanel.WithPanels(panels).Render()
 |Option|Type|
 |------|----|
 |[BottomPadding](https://pkg.go.dev/github.com/pterm/pterm#PanelPrinter.WithBottomPadding)|int|
+|[BoxPrinter](https://pkg.go.dev/github.com/pterm/pterm#PanelPrinter.WithBoxPrinter)|[BoxPrinter](https://pkg.go.dev/github.com/pterm/pterm#BoxPrinter)|
 |[Padding](https://pkg.go.dev/github.com/pterm/pterm#PanelPrinter.WithPadding)|int|
 |[Panels](https://pkg.go.dev/github.com/pterm/pterm#PanelPrinter.WithPanels)|[Panels](https://pkg.go.dev/github.com/pterm/pterm#Panels)|
 |[SameColumnWidth](https://pkg.go.dev/github.com/pterm/pterm#PanelPrinter.WithSameColumnWidth)|...bool|

panel_printer_test.go

@@ -55,7 +55,7 @@ func TestPanelPrinter_RenderMultiplePanelsWithBorder(t *testing.T) {
 			{{Data: Sprint("a\nbc\ndef")}, {Data: Sprint("abcd")}},
 			{{Data: Sprint(a)}},
 		}
-		p := PanelPrinter{}.WithPanels(panels).WithBorder()
+		p := PanelPrinter{}.WithPanels(panels).WithBoxPrinter(DefaultBox)
 		err := p.Render()
 		assert.NoError(t, err)
 	})
@@ -144,19 +144,10 @@ func TestPanelPrinter_WithSameColumnWidth(t *testing.T) {
 	assert.False(t, p.SameColumnWidth)
 }
 
-func TestPanelPrinter_WithBorder(t *testing.T) {
+func TestPanelPrinter_WithBoxPrinter(t *testing.T) {
 	p := PanelPrinter{}
-	p2 := p.WithBorder()
+	p2 := p.WithBoxPrinter(DefaultBox)
 
-	assert.Equal(t, true, p2.Border)
-	assert.Empty(t, p.Border)
-}
-
-func TestPanelPrinter_WithBorderStyle(t *testing.T) {
-	p := PanelPrinter{}
-	s := NewStyle(FgRed, BgRed, Bold)
-	p2 := p.WithBorderStyle(s)
-
-	assert.Equal(t, s, p2.BorderStyle)
-	assert.Empty(t, p.BorderStyle)
+	assert.Equal(t, DefaultBox, p2.BoxPrinter)
+	assert.Empty(t, p.BoxPrinter)
 }

theme.go

@@ -37,7 +37,6 @@ var (
 		LetterStyle:             Style{FgDefault},
 		DebugMessageStyle:       Style{FgGray},
 		DebugPrefixStyle:        Style{FgBlack, BgGray},
-		PanelBorderStyle:        Style{FgDefault},
 		BoxStyle:                Style{FgDefault},
 		BoxTextStyle:            Style{FgDefault},
 		BarLabelStyle:           Style{FgLightCyan},
@@ -82,7 +81,6 @@ type Theme struct {
 	LetterStyle             Style
 	DebugMessageStyle       Style
 	DebugPrefixStyle        Style
-	PanelBorderStyle        Style
 	BoxStyle                Style
 	BoxTextStyle            Style
 	BarLabelStyle           Style
@@ -221,12 +219,6 @@ func (t Theme) WithTreeTextStyle(style Style) Theme {
 	return t
 }
 
-// WithPanelBorderStyle returns a new theme with overridden value.
-func (t Theme) WithPanelBorderStyle(style Style) Theme {
-	t.PanelBorderStyle = style
-	return t
-}
-
 // WithBoxStyle returns a new theme with overridden value.
 func (t Theme) WithBoxStyle(style Style) Theme {
 	t.BoxStyle = style

theme_test.go

@@ -182,14 +182,6 @@ func TestTheme_WithTreeTextStyle(t *testing.T) {
 	assert.Equal(t, s, p2.TreeTextStyle)
 }
 
-func TestTheme_WithPanelBorderStyle(t *testing.T) {
-	s := Style{FgRed, BgBlue, Bold}
-	p := Theme{}
-	p2 := p.WithPanelBorderStyle(s)
-
-	assert.Equal(t, s, p2.PanelBorderStyle)
-}
-
 func TestTheme_WithBoxStyle(t *testing.T) {
 	s := Style{FgRed, BgBlue, Bold}
 	p := Theme{}