housekeeping: .js -> .jsx file extensions (via #5014)

* housekeeping: `.js` -> `.jsx` where necessary

test/components/operation.jsx

@@ -0,0 +1,32 @@
+/* eslint-env mocha */
+import React from "react"
+import expect, { createSpy } from "expect"
+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: createSpy()
+    }
+
+    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()
+  })
+})