feat: add file helper

file_test.go

@@ -0,0 +1,21 @@
+package bimg
+
+import (
+	"testing"
+)
+
+func TestRead(t *testing.T) {
+	buf, err := Read("fixtures/test.jpg")
+
+	if err != nil {
+		t.Errorf("Cannot read the image: %#v", err)
+	}
+
+	if len(buf) == 0 {
+		t.Fatal("Empty buffer")
+	}
+
+	if DetermineImageType(buf) != JPEG {
+		t.Fatal("Image is not jpeg")
+	}
+}