     for fixture in goodFixtures {
       let e = expectation(description: fixture.name)
       let url = fixture.name.contains("http") ? URL(string: fixture.name)! : URL(string: "\(testFixturesBaseURL)\(fixture.name)")!
-      XCTAssertNotNil(try? Data(contentsOf: url))
       
       fastImage.imageSizeAndType(for: url, completion: { result in
         switch result {

  func testUnsupportedImageFormats() {
    fastImage.requestTimeout = 30.0
    
    let images = ["a.CR2", "a.CRW"]
    for filename in images {
      let expectation = self.expectation(description: filename)
      let url = URL(string: "\(testFixturesBaseURL)\(filename)")!

    waitForExpectations(timeout: self.fastImage.requestTimeout + 2.0)
  }
  
  func testDataURI() {
    let e = expectation(description: "Data URI")
    let url = URL(string: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAABCAYAAAD0In+KAAAAD0lEQVR42mNk+M9QzwAEAAmGAYCF+yOnAAAAAElFTkSuQmCC")!
    
    fastImage.imageSizeAndType(for: url, completion: { result in
      switch result {
      case .success(let (size, type)):
        XCTAssertEqual(type, .png)
        XCTAssertEqual(size, CGSize(width: 2, height: 1), "Data URI - Sizes do not match")
      case .failure(let error):
        XCTFail("Data URI failed with error: \(error.localizedDescription)")
      }
      e.fulfill()
    })
    waitForExpectations(timeout: fastImage.requestTimeout + 2.0)
  }
}
