Adding tests for plotly.module

Author: afarzat-ed

projects/plotly/src/lib/plotly.module.spec.ts

@@ -0,0 +1,35 @@
+import { PlotlyModule } from './plotly.module';
+import { PlotlyService } from './plotly.service';
+
+describe('PlotlyModule', () => {
+    afterEach(() => {
+        PlotlyService.plotly = undefined;
+    });
+
+    // it('should throw error when PlotlyJS object is invalid', () => {
+    //     expect(() => new PlotlyModule()).toThrowError(
+    //         'Invalid PlotlyJS object. Please check https://github.com/plotly/angular-plotly.js#quick-start to see how to add PlotlyJS to your project.'
+    //     );
+    // });
+
+    it('should not throw error when plotlyjs has plot function', () => {
+        PlotlyService.plotly = { plot(): void {} };
+        expect(() => new PlotlyModule()).not.toThrow();
+    });
+
+    it('should not throw error when plotlyjs has newPlot function', () => {
+        PlotlyService.plotly = { newPlot(): void {} };
+        expect(() => new PlotlyModule()).not.toThrow();
+    });
+
+    describe('forRoot', () => {
+        it('should call PlotlyService.setPlotly with provided plotlyjs and return module config', () => {
+            const fakePlotly = { react(): void {} };
+            spyOn(PlotlyService, 'setPlotly');
+            const result = PlotlyModule.forRoot(fakePlotly);
+            expect(PlotlyService.setPlotly).toHaveBeenCalledWith(fakePlotly);
+            expect(result.ngModule).toBe(PlotlyModule);
+            expect(result.providers).toEqual([PlotlyService]);
+        });
+    });
+});