Update unit test for SetLegacyDrawingHF function and simplify code

vml.go

@@ -1097,18 +1097,18 @@ func (f *File) SetLegacyDrawingHF(sheet string, g *HeaderFooterGraphics) error {
 			Stroke:         &xlsxStroke{JoinStyle: "miter"},
 			VFormulas: &vFormulas{
 				Formulas: []vFormula{
-					vFormula{Equation: "if lineDrawn pixelLineWidth 0"},
-					vFormula{Equation: "sum @0 1 0"},
-					vFormula{Equation: "sum 0 0 @1"},
-					vFormula{Equation: "prod @2 1 2"},
-					vFormula{Equation: "prod @3 21600 pixelWidth"},
-					vFormula{Equation: "prod @3 21600 pixelHeight"},
-					vFormula{Equation: "sum @0 0 1"},
-					vFormula{Equation: "prod @6 1 2"},
-					vFormula{Equation: "prod @7 21600 pixelWidth"},
-					vFormula{Equation: "sum @8 21600 0"},
-					vFormula{Equation: "prod @7 21600 pixelHeight"},
-					vFormula{Equation: "sum @10 21600 0"},
+					{Equation: "if lineDrawn pixelLineWidth 0"},
+					{Equation: "sum @0 1 0"},
+					{Equation: "sum 0 0 @1"},
+					{Equation: "prod @2 1 2"},
+					{Equation: "prod @3 21600 pixelWidth"},
+					{Equation: "prod @3 21600 pixelHeight"},
+					{Equation: "sum @0 0 1"},
+					{Equation: "prod @6 1 2"},
+					{Equation: "prod @7 21600 pixelWidth"},
+					{Equation: "sum @8 21600 0"},
+					{Equation: "prod @7 21600 pixelHeight"},
+					{Equation: "sum @10 21600 0"},
 				},
 			},
 			VPath: &vPath{ExtrusionOK: "f", GradientShapeOK: "t", ConnectType: "rect"},
@@ -1144,8 +1144,7 @@ func (f *File) SetLegacyDrawingHF(sheet string, g *HeaderFooterGraphics) error {
 	drawingID := f.addRels(sheetRels, SourceRelationshipDrawingVML, sheetRelationshipsDrawingVML, "")
 	f.addSheetNameSpace(sheet, SourceRelationship)
 	f.addSheetLegacyDrawingHF(sheet, drawingID)
-	err := f.setContentTypePartImageExtensions()
-	if err != nil {
+	if err := f.setContentTypePartImageExtensions(); err != nil {
 		return err
 	}
 	return f.setContentTypePartVMLExtensions()

vml_test.go

@@ -413,22 +413,34 @@ func TestExtractFormControl(t *testing.T) {
 	assert.EqualError(t, err, "XML syntax error on line 1: invalid UTF-8")
 }
 
-func ExampleFile_SetLegacyDrawingHF() {
+func TestSetLegacyDrawingHF(t *testing.T) {
 	f := NewFile()
 	sheet := "Sheet1"
 	headerFooterOptions := HeaderFooterOptions{
 		OddHeader: "&LExcelize&R&G",
 	}
-	f.SetHeaderFooter(sheet, &headerFooterOptions)
-	file, _ := os.ReadFile("test/images/excel.png")
-	f.SetLegacyDrawingHF(sheet, &HeaderFooterGraphics{
+	assert.NoError(t, f.SetHeaderFooter(sheet, &headerFooterOptions))
+	file, err := os.ReadFile(filepath.Join("test", "images", "excel.png"))
+	assert.NoError(t, err)
+	assert.NoError(t, f.SetLegacyDrawingHF(sheet, &HeaderFooterGraphics{
+		Extension: ".png",
+		File:      file,
+		Width:     "50pt",
+		Height:    "32pt",
+	}))
+	assert.NoError(t, f.SetCellValue(sheet, "A1", "Example"))
+	assert.NoError(t, f.SaveAs(filepath.Join("test", "TestSetLegacyDrawingHF.xlsx")))
+	assert.NoError(t, f.Close())
+
+	// Test set legacy drawing header/footer with unsupported charset content types
+	f = NewFile()
+	f.ContentTypes = nil
+	f.Pkg.Store(defaultXMLPathContentTypes, MacintoshCyrillicCharset)
+	assert.EqualError(t, f.SetLegacyDrawingHF(sheet, &HeaderFooterGraphics{
 		Extension: ".png",
 		File:      file,
 		Width:     "50pt",
 		Height:    "32pt",
-	})
-	f.SetCellValue(sheet, "A1", "Example")
-	out, _ := os.CreateTemp("", "header-graphics-*.xlsx")
-	f.Write(out)
-	f.Close()
+	}), "XML syntax error on line 1: invalid UTF-8")
+	assert.NoError(t, f.Close())
 }