Plotly object not found on window" when unit testing a component

Error: Plotly object not found on window.
Error: Plotly object not found on window. at new PlotlyViaWindowModule (http://localhost:9876/_karma_webpack_/webpack:/node_modules/angular-plotly.js/fesm2015/angular-plotly.js.js:634:1) at Object.PlotlyViaWindowModule_Factory [as factory] (http://localhost:9876/_karma_webpack_/webpack:/node_modules/angular-plotly.js/fesm2015/angular-plotly.js.js:639:74) at R3Injector.hydrate (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2015/core.js:11457:1) at R3Injector.get (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2015/core.js:11276:1) at http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2015/core.js:11314:1 at Set.forEach (<anonymous>) at R3Injector._resolveInjectorDefTypes (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2015/core.js:11314:1) at new NgModuleRef$1 (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2015/core.js:25345:1) at R3TestBedCompiler.finalize (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2015/testing.js:926:1) at TestBedRender3.get testModuleRef [as testModuleRef] (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2015/testing.js:1789:1)

Tái hiện unit test của component bằng stack trace Karma/Webpack được báo cáo và kiểm tra thiết lập Angular Plotly xung quanh PlotlyViaWindowModule. Được xem là hoàn tất khi test có thể khởi tạo mà không có “Plotly object not found on window”; issue không nêu tên file nguồn hoặc test nào của repository, vì vậy trước tiên hãy xác định chúng từ spec đang bị lỗi.