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/operation.jsx

@@ -0,0 +1,30 @@
+import React from "react"
+import { shallow } from "enzyme"
+import Operation from "components/operation"
+
+describe("<Operation/>", function(){
+  it.skip("blanket tests", function(){
+
+    let props = {
+      operation: {get: ()=>{}},
+      getComponent: ()=> "div",
+      specSelectors: { security(){} },
+      path: "/one",
+      method: "get",
+      shown: true,
+      showOpId: "",
+      showOpIdPrefix: "",
+      toggleCollapse: jest.fn()
+    }
+
+    let wrapper = shallow(<Operation {...props}/>)
+
+    expect(wrapper.find(".opblock").length).toEqual(1)
+    expect(wrapper.find(".opblock-summary-method").text()).toEqual("GET")
+    expect(wrapper.find(".opblock-summary-path").text().trim()).toEqual("/one")
+    expect(wrapper.find("[isOpened]").prop("isOpened")).toEqual(true)
+
+    wrapper.find(".opblock-summary").simulate("click")
+    expect(props.toggleCollapse).toHaveBeenCalled()
+  })
+})