title: Xcode Test not detect my class
body: <p>I have class named Meal.swift in my project and a unit test</p>
  
  <pre><code>func testMealInitialization() {
      // Success case.
      let potentialItem = Meal(name: "Newest meal", photo: nil, rating: 5)
      XCTAssertNotNil(potentialItem)
  
      // Failure cases.
      let noName = Meal(name: "", photo: nil, rating: 0)
      XCTAssertNil(noName, "Empty name is invalid")
  
  }
  </code></pre>
  
  <p>But the problem is that: <strong>Use of unresolved identifier "Meal"</strong></p>