message: adds a test for header title
diff: +import { Serif } from "@artsy/palette"
  import { CollectionHeaderTestsQueryRawResponse } from "__generated__/CollectionHeaderTestsQuery.graphql"
  import { mount } from "enzyme"
  import OpaqueImageView from "lib/Components/OpaqueImageView/OpaqueImageView"
  @@ -38,6 +39,11 @@ describe("collection header", () => {
  expect(wrapper.find(OpaqueImageView).html()).toContain("http://imageuploadedbymarketingteam.jpg")
  })
  + it("passes the collection header title to collection header", () => {
  + const wrapper = mount(<CollectionHeader {...props} />)
  + expect(wrapper.find(Serif).html()).toContain("Street Art Now")
  + })
  +
  it("passes the url of the most marketable artwork in the collection to the collection header when there is no headerImage value present", () => {
  props.collection.headerImage = null
  const wrapper = mount(<CollectionHeader {...props} />)
  