refactor. feat(test): add fixtures

type.go

@@ -1,14 +1,39 @@
 package bimg
 
 const (
-	UNKNOWN = "unknown"
-	JPEG    = "jpeg"
-	WEBP    = "webp"
-	PNG     = "png"
-	TIFF    = "tiff"
-	MAGICK  = "magick"
+	UNKNOWN = iota
+	JPEG
+	WEBP
+	PNG
+	TIFF
+	MAGICK
 )
 
-func DetermineType(buf []byte) string {
+func DetermineImageType(buf []byte) int {
 	return vipsImageType(buf)
 }
+
+func DetermineImageTypeName(buf []byte) string {
+	imageCode := vipsImageType(buf)
+	imageType := "unknown"
+
+	switch {
+	case imageCode == JPEG:
+		imageType = "jpeg"
+		break
+	case imageCode == WEBP:
+		imageType = "webp"
+		break
+	case imageCode == PNG:
+		imageType = "png"
+		break
+	case imageCode == TIFF:
+		imageType = "png"
+		break
+	case imageCode == MAGICK:
+		imageType = "magick"
+		break
+	}
+
+	return imageType
+}