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/operations.jsx

@@ -0,0 +1,126 @@
+import React from "react"
+import { render } from "enzyme"
+import { fromJS } from "immutable"
+import DeepLink from "components/deep-link"
+import Operations from "components/operations"
+import {Collapse} from "components/layout-utils"
+
+const components = {
+  Collapse,
+  DeepLink,
+  OperationContainer: ({ path, method }) => <span className="mocked-op" id={`${path}-${method}`} />,
+  OperationTag: "div",
+}
+
+describe("<Operations/>", function(){
+  it("should render a Swagger2 `get` method, but not a `trace` or `foo` method", function(){
+
+    let props = {
+      fn: {},
+      specActions: {},
+      layoutActions: {},
+      getComponent: (name)=> {
+        return components[name] || null
+      },
+      getConfigs: () => {
+        return {}
+      },
+      specSelectors: {
+        isOAS3() { return false },
+        url() { return "https://petstore.swagger.io/v2/swagger.json" },
+        taggedOperations() {
+          return fromJS({
+          "default": {
+            "operations": [
+              {
+                "path": "/pets/{id}",
+                "method": "get"
+              },
+              {
+                "path": "/pets/{id}",
+                "method": "trace"
+              },
+              {
+                "path": "/pets/{id}",
+                "method": "foo"
+              },
+            ]
+          }
+        })
+        },
+      },
+      layoutSelectors: {
+        currentFilter() {
+          return null
+        },
+        isShown() {
+          return true
+        },
+        show() {
+          return true
+        }
+      }
+    }
+
+    let wrapper = render(<Operations {...props}/>)
+
+    expect(wrapper.find("span.mocked-op").length).toEqual(1)
+    expect(wrapper.find("span.mocked-op").eq(0).attr("id")).toEqual("/pets/{id}-get")
+  })
+
+  it("should render an OAS3 `get` and `trace` method, but not a `foo` method", function(){
+
+    let props = {
+      fn: {},
+      specActions: {},
+      layoutActions: {},
+      getComponent: (name)=> {
+        return components[name] || null
+      },
+      getConfigs: () => {
+        return {}
+      },
+      specSelectors: {
+        isOAS3() { return true },
+        url() { return "https://petstore.swagger.io/v2/swagger.json" },
+        taggedOperations() {
+          return fromJS({
+          "default": {
+            "operations": [
+              {
+                "path": "/pets/{id}",
+                "method": "get"
+              },
+              {
+                "path": "/pets/{id}",
+                "method": "trace"
+              },
+              {
+                "path": "/pets/{id}",
+                "method": "foo"
+              },
+            ]
+          }
+        })
+        },
+      },
+      layoutSelectors: {
+        currentFilter() {
+          return null
+        },
+        isShown() {
+          return true
+        },
+        show() {
+          return true
+        }
+      }
+    }
+
+    let wrapper = render(<Operations {...props}/>)
+
+    expect(wrapper.find("span.mocked-op").length).toEqual(2)
+    expect(wrapper.find("span.mocked-op").eq(0).attr("id")).toEqual("/pets/{id}-get")
+    expect(wrapper.find("span.mocked-op").eq(1).attr("id")).toEqual("/pets/{id}-trace")
+  })
+})