Increase coverage by checking errors even when save method doesn't …

…throw an error.

If the save method doesn't throw an error, the catch block is never executed, so the error assertion inside the catch block wouldn't execute. To ensure the error assertions always run, we need to move it outside the catch block.

EssentialFeed/EssentialFeedTests/Feed Cache/CacheFeedUseCaseTests.swift

@@ -75,11 +75,15 @@ class CacheFeedUseCaseTests: XCTestCase {
 	private func expect(_ sut: LocalFeedLoader, toCompleteWithError expectedError: NSError?, when action: () -> Void, file: StaticString = #filePath, line: UInt = #line) {
 		action()
 
+		var receivedError: NSError?
+
 		do {
 			try sut.save(uniqueImageFeed().models)
 		} catch {
-			XCTAssertEqual(error as NSError?, expectedError, file: file, line: line)
+			receivedError = error as NSError?
 		}
+
+		XCTAssertEqual(receivedError, expectedError, file: file, line: line)
 	}
 
 }