refactored test

lib/single-file/rules-minifier.js

@@ -104,11 +104,7 @@ this.rulesMinifier = this.rulesMinifier || (() => {
 					stylesheetContent += "@media " + Array.prototype.join.call(rule.media, ",") + " {";
 					stylesheetContent += deleteUnusedFonts(doc, rule.cssRules, unusedFonts);
 					stylesheetContent += "}";
-				} else if (rule.selectorText) {
-					stylesheetContent += rule.cssText;
-				} else if (rule.type == CSSRule.FONT_FACE_RULE && rule.style && rule.style.fontFamily && !unusedFonts.includes(getFontFamily(rule.style.fontFamily))) {
-					stylesheetContent += rule.cssText;
-				} else if (rule.type != CSSRule.FONT_FACE_RULE) {
+				} else if (rule.type != CSSRule.FONT_FACE_RULE || (rule.type == CSSRule.FONT_FACE_RULE && rule.style && rule.style.fontFamily && !unusedFonts.includes(getFontFamily(rule.style.fontFamily)))) {
 					stylesheetContent += rule.cssText;
 				}
 			});