Remove duplicated test

Tests/KingfisherTests/KingfisherManagerTests.swift

@@ -148,33 +148,6 @@ class KingfisherManagerTests: XCTestCase {
         waitForExpectations(timeout: 1, handler: nil)
     }
     
-    func testRetrieveImageWithoutWaitForCache() {
-        let exp = expectation(description: #function)
-        let url = testURLs[0]
-        stub(url, data: testImageData)
-        
-        let manager = self.manager!
-        manager.retrieveImage(with: url, options: []) { result in
-            XCTAssertNotNil(result.value?.image)
-            XCTAssertEqual(result.value!.cacheType, .none)
-            
-            var cacheType = manager.cache.imageCachedType(forKey: url.cacheKey)
-            XCTAssertEqual(cacheType, .memory)
-            
-            manager.cache.clearMemoryCache()
-            cacheType = manager.cache.imageCachedType(forKey: url.cacheKey)
-            XCTAssertEqual(cacheType, .none)
-            
-            // Wait for disk cache finishes
-            delay(0.1) {
-                cacheType = manager.cache.imageCachedType(forKey: url.cacheKey)
-                XCTAssertEqual(cacheType, .disk)
-                exp.fulfill()
-            }
-        }
-        waitForExpectations(timeout: 1, handler: nil)
-    }
-    
     func testSuccessCompletionHandlerRunningOnMainQueueDefaultly() {
         let progressExpectation = expectation(description: "progressBlock running on main queue")
         let completionExpectation = expectation(description: "completionHandler running on main queue")