Add visual screenshot test

cli/pdf.test.ts

@@ -0,0 +1,60 @@
+import {toMatchImageSnapshot} from "jest-image-snapshot"
+import puppeteer, {Browser, Page} from "puppeteer"
+
+expect.extend({toMatchImageSnapshot})
+
+const fileName = 'Andrii_Kirmas'
+, cwd = process.cwd()
+
+let browser: Browser, page :Page
+
+beforeAll(async () => {
+  browser = await puppeteer.launch({
+    "args": ["--allow-file-access-from-files", "--enable-local-file-accesses "]
+  })
+  page = await browser.newPage()  
+})
+
+it("web", async () => {
+  await page.goto(`file://${cwd}/index.html`, {
+    "waitUntil": "networkidle2"
+  })
+   await page.setViewport({ width: 1800, height: 980 })
+
+  const screenshot = await page.screenshot({
+    "fullPage": true,
+    "type": "png"
+  })
+
+  expect(screenshot).toMatchImageSnapshot( {
+    "customSnapshotIdentifier": `${fileName}-web`
+  })
+
+  if (process.env.npm_config_pdf_gen)
+    await page.pdf({
+      "path": `${cwd}/${fileName}.pdf`,
+      "format": "A4",
+      "printBackground": true,
+      "pageRanges": '1',
+      "scale": 0.70
+    })
+})
+
+it.skip("pdf https://bugs.chromium.org/p/chromium/issues/detail?id=761295", async () => {
+
+  await page.goto(`file://${cwd}/${fileName}.pdf`, {
+    "waitUntil": "networkidle2"
+  })
+
+  const screenshot = await page.screenshot({
+    "fullPage": true,
+    "type": "png"
+  })
+
+  expect(screenshot).toMatchImageSnapshot( {
+    "customSnapshotIdentifier": `${fileName}-pdf`
+  })
+})
+
+
+afterAll(async () => await browser.close())

jest.config.json

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+{
+  "preset": "ts-jest",
+  "testEnvironment": "node"
+}