Question

考虑一下这个代码是有效的（loginWithEmail方法可以预期的那样，预期）：

_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。

当模拟为expect时，为什么mockForProtocol会失败？

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。模拟对象的使用方式有什么不同吗？在您的情况下，_authenticationService传递给哪里？接收者做了什么？

OCMock，为什么我不能指望协议上的方法？

1 个答案: