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

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

test/components/primitive-model.jsx

@@ -0,0 +1,52 @@
+/* eslint-env mocha */
+import React from "react"
+import expect from "expect"
+import { shallow } from "enzyme"
+import { fromJS } from "immutable"
+import PrimitiveModel from "components/primitive-model"
+
+describe("<PrimitiveModel/>", function() {
+    describe("Model name", function() {
+        const dummyComponent = () => null
+        const components = {
+            Markdown: dummyComponent,
+            EnumModel: dummyComponent
+        }
+        const props = {
+            getComponent: c => components[c],
+            getConfigs: () => ({
+                showExtensions: false
+            }),
+            name: "Name from props",
+            depth: 1,
+            schema: fromJS({
+                type: "string",
+                title: "Custom model title"
+            })
+        }
+
+        it("renders the schema's title", function() {
+            // When
+            const wrapper = shallow(<PrimitiveModel {...props}/>)
+            const modelTitleEl = wrapper.find("span.model-title")
+            expect(modelTitleEl.length).toEqual(1)
+
+            // Then
+            expect( modelTitleEl.text() ).toEqual( "Custom model title" )
+        })
+
+        it("falls back to the passed-in `name` prop for the title", function() {
+            // When
+            props.schema = fromJS({
+                type: "string"
+            })
+            const wrapper = shallow(<PrimitiveModel {...props}/>)
+            const modelTitleEl = wrapper.find("span.model-title")
+            expect(modelTitleEl.length).toEqual(1)
+
+            // Then
+            expect( modelTitleEl.text() ).toEqual( "Name from props" )
+        })
+
+    })
+} )