Remove redundant tests

Author: kean

Sources/ImagePreheater.swift

@@ -81,7 +81,6 @@ public final class ImagePreheater {
         let operation = Operation(starter: { [weak self] finish in
             let task = self?.pipeline.loadImage(with: request) { [weak self] _, _  in
                 self?._remove(task)
-                self?.didFinishPreheatingRequest?(task.request)
                 finish()
             }
             token.register {
@@ -154,9 +153,6 @@ public final class ImagePreheater {
         return request
     }
 
-    /// For testing purposes.
-    var didFinishPreheatingRequest: ((ImageRequest) -> Void)?
-
     private final class Task {
         let key: PreheatKey
         let request: ImageRequest

Tests/ImagePreheaterTests.swift

@@ -112,41 +112,3 @@ class ImagePreheaterTests: XCTestCase {
         wait()
     }
 }
-
-class ImagePreheterDiskCacheTests: XCTestCase {
-    var imageCache: MockImageCache!
-    var dataLoader: MockDataLoader!
-    var pipeline: ImagePipeline!
-    var preheater: ImagePreheater!
-
-    override func setUp() {
-        super.setUp()
-
-        pipeline = MockImagePipeline()
-        dataLoader = MockDataLoader()
-        imageCache = MockImageCache()
-        pipeline = ImagePipeline {
-            $0.dataLoader = dataLoader
-            $0.imageCache = imageCache
-            $0.imageDecoder = { _ in
-                XCTFail("The pipeline tried to decode the image data")
-                return ImageDecoder()
-            }
-        }
-        preheater = ImagePreheater(pipeline: pipeline)
-    }
-
-    func testPreheatingIntoDiskCache() {
-        // Given preheater with .diskCache destination
-        preheater = ImagePreheater(pipeline: pipeline, destination: .diskCache, maxConcurrentRequestCount: 1)
-
-        let expectation = self.expectation(description: "Finished preheating")
-        preheater.didFinishPreheatingRequest = { _ in
-            XCTAssertTrue(self.imageCache.images.isEmpty)
-            expectation.fulfill()
-        }
-
-        preheater.startPreheating(with: [Test.request])
-        wait()
-    }
-}