OCMock,为什么我不能指望协议上的方法？

Question

考虑这个有效的代码(loginWithEmail方法得到预期的,好的,预期的):

_authenticationService = [[OCMockObject mockForClass:[AuthenticationService class]] retain];
[[_authenticationService expect] loginWithEmail:[OCMArg any] andPassword:[OCMArg any]];

与此代码对比:

_authenticationService = [[OCMockObject mockForProtocol:@protocol(AuthenticationServiceProtocol)] retain];
[[_authenticationService expect] loginWithEmail:[OCMArg any] andPassword:[OCMArg any]];

第二个代码示例在第2行失败,出现以下错误:

*** -[NSProxy doesNotRecognizeSelector:loginWithEmail:andPassword:] called! Unknown.m:0: error: -[MigratorTest methodRedacted] : ***
-[NSProxy doesNotRecognizeSelector:loginWithEmail:andPassword:] called!

AuthenticationServiceProtocol声明方法:

@protocol AuthenticationServiceProtocol <NSObject>
@property (nonatomic, retain) id<AuthenticationDelegate> authenticationDelegate;

- (void)loginWithEmail:(NSString *)email andPassword:(NSString *)password;
- (void)logout;
- (void)refreshToken;

@end

它在课堂上实现:

@interface AuthenticationService : NSObject <AuthenticationServiceProtocol>

这是使用OCMock for iOS.

expect当模拟是一个时,为什么会失败mockForProtocol？

Answer 1

这很奇怪。我已将以下类添加到 iOS5 示例项目中：

@protocol AuthenticationServiceProtocol

- (void)loginWithEmail:(NSString *)email andPassword:(NSString *)password;

@end

@interface Foo : NSObject
{
    id<AuthenticationServiceProtocol> authService;
}

- (id)initWithAuthenticationService:(id<AuthenticationServiceProtocol>)anAuthService;
- (void)doStuff;

@end

@implementation Foo

- (id)initWithAuthenticationService:(id<AuthenticationServiceProtocol>)anAuthService
{
    self = [super init];
    authService = anAuthService;
    return self;
}

- (void)doStuff
{
    [authService loginWithEmail:@"x" andPassword:@"y"];
}

@end

@implementation ProtocolTests

- (void)testTheProtocol
{
    id authService = [OCMockObject mockForProtocol:@protocol(AuthenticationServiceProtocol)];
    id foo = [[Foo alloc] initWithAuthenticationService:authService];

    [[authService expect] loginWithEmail:[OCMArg any] andPassword:[OCMArg any]];

    [foo doStuff];

    [authService verify];
}

@end

当我在 Xcode 版本 4.5 (4G182) 中针对 iPhone 6.0 模拟器运行此测试时，测试通过了。模拟对象的使用方式有什么不同吗？在您的情况下， _authenticationService 传递到哪里？收件人正在对它做什么？