test(addons/InfoBox): add export spec

* Ref #610

src/components/addons/__tests__/InfoBox.spec.jsx

@@ -0,0 +1,19 @@
+describe("addons/InfoBox module", () => {
+  const {
+    __esModule,
+    default: DefaultExport,
+    InfoBox: NamedExport,
+  } = require("../InfoBox")
+
+  it("should be an ES module", () => {
+    expect(__esModule).toBe(true)
+  })
+
+  it("should be default exported", () => {
+    expect(DefaultExport).toBeDefined()
+  })
+
+  it("should be named exported", () => {
+    expect(NamedExport).toBeDefined()
+  })
+})