testing - How to test angular 2 directive Supplied parameters do not match any signature of call target -


i have directive want test. every time run test, error says 'supplied parameters not match signature of call target'. how parameters of constructor test?

this directive: 

import { directive, elementref, hostlistener, input, renderer } '@angular/core';  @directive({   selector: '[fbinputlistener]' }) export class inputlistenerdirective {    constructor( private elref: elementref, private renderer: renderer ) { }    @hostlistener('keyup') onkeyup() {     if(this.elref.nativeelement.value.length > 0) {       this.renderer.setelementclass(this.elref.nativeelement, 'form__input--has-value', true);     } else {       this.renderer.setelementclass(this.elref.nativeelement, 'form__input--has-value', false);      }   } }

this it's test:

import { inputlistenerdirective } './inputlistener.directive';  describe('inputlistenerdirective', () => {   it('should create instance', () => {     const directive = new inputlistenerdirective();     expect(directive).tobetruthy();   }); }); 

import {testbed, componentfixture} '@angular/core/testing'; import {by} "@angular/platform-browser"; import {component, debugelement} "@angular/core"; import { inputlistenerdirective } './inputlistener.directive';  @component({    template: `<input type="number" fbinputlistener value="12345">`  }) class testinputcomponent { }  describe('inputlistenerdirective', () => {    let component: testinputcomponent;    let fixture: componentfixture<testinputcomponent>;    let inputel: debugelement;   beforeeach(() => {    testbed.configuretestingmodule({      declarations: [testinputcomponent, inputlistenerdirective]    });     fixture = testbed.createcomponent(testinputcomponent);    component = fixture.componentinstance;    inputel = fixture.debugelement.query(by.css('input')); });  it('directive should add class test input', () => {    inputel.triggereventhandler('keyup', null);    fixture.detectchanges();     expect(inputel.nativeelement.classlist.length).tobe(1);  }); });

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