feat(jest): 84% coverage for utilities/EnvInfo.ts (#1620)

package.json

@@ -61,6 +61,7 @@
     "io-ts-promise": "^2.0.2",
     "jest-config": "^27.3.1",
     "jest-fetch-mock": "^3.0.3",
+    "jest-webgl-canvas-mock": "^0.2.3",
     "less": "^4.1.1",
     "less-loader": "^7.1.1",
     "lodash": "^4.17.21",

utilities/EnvInfo.test.ts

@@ -0,0 +1,31 @@
+import { EnvInfo } from './EnvInfo'
+import 'jest-canvas-mock'
+import 'jest-webgl-canvas-mock'
+global.console.warn = jest.fn()
+HTMLCanvasElement.prototype.getContext = jest.fn()
+// HTMLCanvasElement. = jest.fn()
+// HTMLCanvasElement.prototype.getParameter = jest.fn()
+
+let canvas
+
+describe('init', () => {
+  beforeEach(() => {
+    canvas = document.createElement('canvas')
+  })
+  test('constructor success', () => {
+    const envinfo = new EnvInfo()
+    // const gl =
+    //   canvas.getContext('webgl') || canvas.getContext('experimental-webgl')
+    expect(jest.spyOn(canvas, 'getContext')).toHaveBeenCalled()
+    // expect(jest.spyOn(gl, 'getExtension')).toHaveBeenCalled()
+
+    // gl is currently commented out because of the Error: `Cannot spyOn on a primitive value; undefined given`
+  })
+  test('constructor fail', () => {
+    HTMLCanvasElement.prototype.getContext = () => {
+      throw new Error('mocked error')
+    }
+    const envinfo = new EnvInfo()
+    expect(console.warn).toHaveBeenCalled()
+  })
+})