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

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

test/components/models.jsx

@@ -0,0 +1,54 @@
+/* eslint-env mocha */
+import React from "react"
+import expect, { createSpy } from "expect"
+import { shallow } from "enzyme"
+import { fromJS, Map } from "immutable"
+import Models from "components/models"
+import ModelCollpase from "components/model-collapse"
+import ModelComponent from "components/model-wrapper"
+
+describe("<Models/>", function(){
+  // Given
+  let components = {
+    Collapse: ModelCollpase,
+    ModelWrapper: ModelComponent
+  }
+  let props = {
+    getComponent: (c) => {
+        return components[c]
+    },
+    specSelectors: {
+      isOAS3: () => false,
+      specJson: () => Map(),
+      definitions: function() {
+        return fromJS({
+          def1: {},
+          def2: {}
+        })
+      },
+      specResolvedSubtree: () => {}
+    },
+    layoutSelectors: {
+      isShown: createSpy()
+    },
+    layoutActions: {},
+    getConfigs: () => ({
+      docExpansion: "list",
+      defaultModelsExpandDepth: 0
+    })
+  }
+
+
+  it("passes defaultModelsExpandDepth to ModelWrapper", function(){
+    // When
+    let wrapper = shallow(<Models {...props}/>)
+
+    // Then should render tabs
+    expect(wrapper.find("ModelCollapse").length).toEqual(1)
+    expect(wrapper.find("ModelWrapper").length).toBeGreaterThan(0)
+    wrapper.find("ModelComponent").forEach((modelWrapper) => {
+      expect(modelWrapper.props().expandDepth).toBe(0)
+    })
+  })
+
+})