有什么方法可以模拟用户在 XCTest 函数中的输入吗?

Is there any way to emulate user's input in XCTest function?

我有需要用户输入的方法

@implementation TeamFormation
- (void)run {
    NSFileHandle *kbd = [NSFileHandle fileHandleWithStandardInput];
    NSData *inputData = [kbd availableData];
    NSString *option = [[[NSString alloc] initWithData:inputData
                     encoding:NSUTF8StringEncoding] substringToIndex:1];
    NSLog(@"%@",option);
}
@end

那我想用一个测试用例来覆盖这个方法

@interface TeamFormationTests : XCTestCase

@end

@implementation TeamFormationTests

- (void)testTeamFormation {
    TeamFormation *teamFormation = [TeamFormation new];
    [teamFormation run];

    // emulate user's input here
}

@end

那么,如何在测试用例函数中模拟用户的输入呢?

您有多种选择来实现这一点。下面两个很明显。

更改 run 以接受参数

  • - (void)run- (void)runWithFileHandle:(NSFileHandle *)handle
  • 您的应用代码可以传递标准输入文件句柄
  • 您的测试代码可以将句柄传递给具有所需输入的文件

用协议模拟它

创建 DataProvider 协议:

@protocol DataProvider

@property(readonly, copy) NSData *availableData;

@end

使NSFileHandle符合这个协议:

@interface NSFileHandle (AvailableDataProvider) <DataProvider>
@end

TeamFormation 上存储实现此协议的对象:

@interface TeamFormation : NSObject

@property (nonatomic, nonnull, strong) id<DataProvider> dataProvider;

- (NSString *)run;

@end

默认情况下,使用标准输入文件句柄:

@implementation TeamFormation

- (instancetype)init {
    if ((self = [super init]) == nil) {
        return nil;
    }
    
    _dataProvider = [NSFileHandle fileHandleWithStandardInput];
    return self;
}

- (NSString *)run {
    NSData *inputData = [self.dataProvider availableData];
    return [[[NSString alloc] initWithData:inputData encoding:NSUTF8StringEncoding] substringToIndex:1];
}

@end

在您的测试中创建 TestDataProvider

@interface TestDataProvider: NSObject<DataProvider>

@property (nonatomic, strong, nonnull) NSData *dataToProvide;

@end

@implementation TestDataProvider

- (instancetype)init {
    if ((self = [super init]) == nil) {
        return nil;
    }
    
    _dataToProvide = [NSData new];
    
    return self;
}

- (NSData *)availableData {
    return _dataToProvide;
}

@end

并在TestFormationTests中使用:

@implementation TeamFormationTests

- (void)testFormationRun {
    TestDataProvider *dataProvider = [TestDataProvider new];
    TeamFormation *formation = [TeamFormation new];
    formation.dataProvider = dataProvider;
    
    XCTAssertThrows([formation run]);
    
    dataProvider.dataToProvide = [@"foo" dataUsingEncoding:NSUTF8StringEncoding];
    XCTAssertEqualObjects([formation run], @"f");
    
    dataProvider.dataToProvide = [@"bar" dataUsingEncoding:NSUTF8StringEncoding];
    XCTAssertEqualObjects([formation run], @"b");
}

@end