ReactiveCocoaFramework/ReactiveCocoaTests/RACControlCommandExamples.m

//
//  RACControlCommandExamples.m
//  ReactiveCocoa
//
//  Created by Justin Spahr-Summers on 2013-08-15.
//  Copyright (c) 2013 GitHub, Inc. All rights reserved.
//

#import "RACControlCommandExamples.h"

#import "RACCommand.h"
#import "RACSubject.h"
#import "RACUnit.h"

NSString * const RACControlCommandExamples = @"RACControlCommandExamples";
NSString * const RACControlCommandExampleControl = @"RACControlCommandExampleControl";
NSString * const RACControlCommandExampleActivateBlock = @"RACControlCommandExampleActivateBlock";

// Methods used by the unit test that would otherwise require platform-specific
// imports.
@interface NSObject (RACControlCommandExamples)

@property (nonatomic, strong) RACCommand *rac_command;

- (BOOL)isEnabled;

@end

SharedExampleGroupsBegin(RACControlCommandExamples)

sharedExamplesFor(RACControlCommandExamples, ^(NSDictionary *data) {
	__block id control;
	__block void (^activate)(id);

	__block RACSubject *enabledSubject;
	__block RACCommand *command;

	beforeEach(^{
		control = data[RACControlCommandExampleControl];
		activate = [data[RACControlCommandExampleActivateBlock] copy];

		enabledSubject = [RACSubject subject];
		command = [[RACCommand alloc] initWithEnabled:enabledSubject signalBlock:^(id sender) {
			return [RACSignal return:sender];
		}];

		[control setRac_command:command];
	});

	it(@"should bind the control's enabledness to the command", ^{
		expect([control isEnabled]).will.beTruthy();

		[enabledSubject sendNext:@NO];
		expect([control isEnabled]).will.beFalsy();
		
		[enabledSubject sendNext:@YES];
		expect([control isEnabled]).will.beTruthy();
	});

	it(@"should execute the control's command when activated", ^{
		__block BOOL executed = NO;
		[[command.executionSignals flatten] subscribeNext:^(id sender) {
			expect(sender).to.equal(control);
			executed = YES;
		}];
		
		activate(control);
		expect(executed).will.beTruthy();
	});
	
	it(@"should overwrite an existing command when setting a new one", ^{
		RACCommand *secondCommand = [[RACCommand alloc] initWithSignalBlock:^(id _) {
			return [RACSignal return:RACUnit.defaultUnit];
		}];
		
		[control setRac_command:secondCommand];
		expect([control rac_command]).to.beIdenticalTo(secondCommand);
	});
});

SharedExampleGroupsEnd