feat: migrate unit tests to Jest (#6353)

* config(jest): updated setup
* config(jest): update testMatch to include jsx files
* config(jest): add transformIgnorePatterns
* config(jest): update ignore files that do not work in jest yet
* config: add test:unit-jest to test script

* fix(jest): lint with eslint-plugin-jest

* refactor(jest): move unit test directory
* refactor(mocha): restore mocha tests that fail in jest

* docs(jest): update helpful scripts with test:unit-jest

test/unit/xss/anchor-target-rel/markdown.jsx

@@ -0,0 +1,64 @@
+import React from "react"
+import { render } from "enzyme"
+import Markdown from "components/providers/markdown"
+import { Markdown as OAS3Markdown } from "corePlugins/oas3/wrap-components/markdown.jsx"
+
+describe("Markdown Link Anchor Safety", function () {
+  describe("Swagger 2.0", function () {
+    it("sanitizes Markdown links", function () {
+      const str = `Hello, [here](http://google.com/) is my link`
+      const wrapper = render(<Markdown source={str} />)
+
+      const anchor = wrapper.find("a")
+
+      expect(anchor.attr("href")).toEqual("http://google.com/")
+      expect(anchor.attr("target")).toEqual("_blank")
+      expect(anchor.attr("rel") || "").toMatch("noopener")
+      expect(anchor.attr("rel") || "").toMatch("noreferrer")
+    })
+
+    it("sanitizes raw HTML links", function () {
+      const str = `Hello, <a href="http://google.com/">here</a> is my link`
+      const wrapper = render(<Markdown source={str} />)
+
+      const anchor = wrapper.find("a")
+
+      expect(anchor.attr("href")).toEqual("http://google.com/")
+      expect(anchor.attr("rel") || "").toMatch("noopener")
+      expect(anchor.attr("rel") || "").toMatch("noreferrer")
+    })
+  })
+
+  describe("OAS 3", function () {
+    it("sanitizes Markdown links", function () {
+      const str = `Hello, [here](http://google.com/) is my link`
+      const wrapper = render(<OAS3Markdown source={str} />)
+
+      const anchor = wrapper.find("a")
+
+      expect(anchor.attr("href")).toEqual("http://google.com/")
+      expect(anchor.attr("target")).toEqual("_blank")
+      expect(anchor.attr("rel") || "").toMatch("noopener")
+      expect(anchor.attr("rel") || "").toMatch("noreferrer")
+    })
+
+    it("sanitizes raw HTML links", function () {
+      const str = `Hello, <a href="http://google.com/">here</a> is my link`
+      const wrapper = render(<OAS3Markdown source={str} />)
+
+      const anchor = wrapper.find("a")
+
+      expect(anchor.attr("href")).toEqual("http://google.com/")
+      expect(anchor.attr("rel") || "").toMatch("noopener")
+      expect(anchor.attr("rel") || "").toMatch("noreferrer")
+    })
+  })
+})
+
+function withMarkdownWrapper(str, { isOAS3 = false } = {}) {
+  if(isOAS3) {
+    return `<div class="renderedMarkdown"><p>${str}</p></div>`
+  }
+
+  return `<div class="markdown"><p>${str}</p>\n</div>`
+}