Fix the following javascript error:
new URL('http://test.com/path?a=b).searchParams.set('a',b')
com.gargoylesoftware.htmlunit.ScriptException: TypeError: Cannot find function set in object a=b.
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:949)
	at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:598)
	at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:487)
	at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.callSecured(HtmlUnitContextFactory.java:353)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:829)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:805)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:796)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.<init>(ScriptableObject.java:390)
	at com.gargoylesoftware.htmlunit.javascript.HtmlUnitScriptable.<init>(HtmlUnitScriptable.java:35)
	at com.gargoylesoftware.htmlunit.javascript.SimpleScriptable.<init>(SimpleScriptable.java:52)
	at com.gargoylesoftware.htmlunit.javascript.host.URLSearchParams.<init>(URLSearchParams.java:123)
	at com.gargoylesoftware.htmlunit.javascript.host.URL.getSearchParams(URL.java:227)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)