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/object-model.jsx

@@ -0,0 +1,109 @@
+import React from "react"
+import { shallow } from "enzyme"
+import { List } from "immutable"
+import ObjectModel from "components/object-model"
+// import ModelExample from "components/model-example"
+import Immutable from "immutable"
+import Model from "components/model"
+import ModelCollapse from "components/model-collapse"
+import Property from "components/property"
+// import { inferSchema } from "corePlugins/samples/fn"
+
+describe("<ObjectModel />", function() {
+    const dummyComponent = () => null
+    const components = {
+      "JumpToPath" : dummyComponent,
+      "Markdown" : dummyComponent,
+      "Model" : Model,
+      "ModelCollapse" : ModelCollapse,
+      "Property" : Property
+    }
+    const props = {
+      getComponent: c => components[c],
+      getConfigs: () => {
+        return {
+          showExtensions: true
+        }
+      },
+      isRef : false,
+      specPath: List(),
+      schema: Immutable.fromJS(
+        {
+          "properties": {
+            // Note reverse order: c, b, a
+            c: {
+              type: "integer",
+              name: "c"
+            },
+            b: {
+              type: "boolean",
+              name: "b"
+            },
+            a: {
+              type: "string",
+              name: "a"
+            }
+          }
+        }
+      ),
+      specSelectors: {
+        isOAS3(){
+          return false
+        }
+      },
+      className: "for-test"
+    }
+    const propsNullable = {
+      ...props,
+      schema: props.schema.set("nullable", true)
+    }
+    const propsMinMaxProperties = {
+      ...props,
+      schema: props.schema.set("minProperties", 1).set("maxProperties", 5)
+    }
+
+    it("renders a collapsible header", function(){
+      const wrapper = shallow(<ObjectModel {...props}/>)
+      const renderedModelCollapse = wrapper.find(ModelCollapse)
+      expect(renderedModelCollapse.length).toEqual(1)
+    })
+
+    it("renders the object properties in order", function() {
+        const wrapper = shallow(<ObjectModel {...props}/>)
+        const renderedModel = wrapper.find(Model)
+        expect(renderedModel.length).toEqual(3)
+        expect(renderedModel.get(0).props.schema.get("name")).toEqual("c")
+        expect(renderedModel.get(1).props.schema.get("name")).toEqual("b")
+        expect(renderedModel.get(2).props.schema.get("name")).toEqual("a")
+    })
+
+    it("doesn't render `nullable` for model when it absent", function() {
+      const wrapper = shallow(<ObjectModel {...props}/>)
+      const renderProperties = wrapper.find(Property)
+      expect(renderProperties.length).toEqual(0)
+    })
+
+    it("renders `nullable` for model", function() {
+      const wrapper = shallow(<ObjectModel {...propsNullable}/>)
+      const renderProperties = wrapper.find(Property)
+      expect(renderProperties.length).toEqual(1)
+      expect(renderProperties.get(0).props.propKey).toEqual("nullable")
+      expect(renderProperties.get(0).props.propVal).toEqual(true)
+    })
+
+    it("doesn't render `minProperties` and `maxProperties` if they are absent", function() {
+      const wrapper = shallow(<ObjectModel {...props}/>)
+      const renderProperties = wrapper.find(Property)
+      expect(renderProperties.length).toEqual(0)
+    })
+
+    it("renders `minProperties` and `maxProperties` if they are defined", function() {
+      const wrapper = shallow(<ObjectModel {...propsMinMaxProperties}/>)
+      const renderProperties = wrapper.find(Property)
+      expect(renderProperties.length).toEqual(2)
+      expect(renderProperties.get(0).props.propKey).toEqual("minProperties")
+      expect(renderProperties.get(0).props.propVal).toEqual(1)
+      expect(renderProperties.get(1).props.propKey).toEqual("maxProperties")
+      expect(renderProperties.get(1).props.propVal).toEqual(5)
+    })
+})