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/components/response-body.jsx

@@ -0,0 +1,42 @@
+import React from "react"
+import { shallow } from "enzyme"
+import ResponseBody from "components/response-body"
+
+describe("<ResponseBody />", function () {
+  const highlightCodeComponent = () => null
+  const components = {
+    highlightCode: highlightCodeComponent
+  }
+  const props = {
+    getComponent: c => components[c],
+  }
+
+  it("renders ResponseBody as 'application/json'", function () {
+    props.contentType = "application/json"
+    props.content = "{\"key\": \"a test value\"}"
+    const wrapper = shallow(<ResponseBody {...props} />)
+    expect(wrapper.find("highlightCodeComponent").length).toEqual(1)
+  })
+
+  it("renders ResponseBody as 'text/html'", function () {
+    props.contentType = "application/json"
+    props.content = "<b>Result</b>"
+    const wrapper = shallow(<ResponseBody {...props} />)
+    expect(wrapper.find("highlightCodeComponent").length).toEqual(1)
+  })
+
+  it("renders ResponseBody as 'image/svg'", function () {
+    props.contentType = "image/svg"
+    const wrapper = shallow(<ResponseBody {...props} />)
+    console.warn(wrapper.debug())
+    expect(wrapper.find("highlightCodeComponent").length).toEqual(0)
+  })
+
+  it("should render a copyable highlightCodeComponent for text types", function () {
+    props.contentType = "text/plain"
+    props.content = "test text"
+    const wrapper = shallow(<ResponseBody {...props} />)
+    console.warn(wrapper.debug())
+    expect(wrapper.find("highlightCodeComponent[canCopy]").length).toEqual(1)
+  })
+})