Unit testing en iOS @ MobileCon Galicia

Unit Testing en iOS
@hpique

Así terminan los programadores que no hacen unit testing

Agenda

• Unit Testing
• OCUnit
• GHUnit
• Proﬁt!

Unit Testing

Testeo de unidades mínimas de
código mediante código

- (void)testColorFromHex {
NSString* colorString = @"#d34f01";

UIColor* color = [colorString colorFromHex];

const CGFloat *c = CGColorGetComponents(color.CGColor);
STAssertEquals(c[0], 211/255.0f, colorString, @"");
STAssertEquals(CGColorGetAlpha(color.CGColor), 1.0f,
colorString, @"");
}

Razones para no hacer
unit testing

RazonesExcusas para
no hacer unit testing

Excusas

• “No lo necesito”

Excusas

• “El plazo es muy ajustado”

Excusas

• “No aplica para este proyecto”

Excusas

• “No aplica para este proyecto”
• “Unit testing en XCode apesta”

Razones para sí hacer
unit testing

unit testing
• Corregir bugs antes

unit testing
• Reﬁnar el diseño

unit testing
• Facilitar cambios

unit testing
• Documentación útil

unit testing
• Documentación útil
• Reducir tiempo de testeo

¿Cuándo?

• Lo antes posible (TDD)

¿Cuándo?

• En paralelo

¿Cuándo?

• En paralelo
• Al corregir bugs

Deﬁniciones
Test Suite

SetUp

Test Case Test Case Test Case

TearDown

OCUnit

• Framework de Unit Testing para Obj-C
• Único framework de testeo integrado
nativamente en XCode

Unit testing en iOS @ MobileCon Galicia

#import <SenTestingKit/SenTestingKit.h>

@interface HelloWorldTests : SenTestCase

@end

@implementation HelloWorldTests

- (void)setUp
{
[super setUp];

// Set-up code here.
}

- (void)tearDown
{
// Tear-down code here.

[super tearDown];
}

- (void)testExample
{
STFail(@"Unit tests are not implemented yet in HelloWorldTests");
}

@end

Escribiendo unit tests
con OCUnit
• Cada Test Suite es una clase que hereda de
SenTestCase

• Cada Test Case debe ser un método con el
preﬁjo test

• setUp y tearDown son opcionales

Console output
2011-12-09 12:43:01.394 HelloWorld[2858:fb03] Applications are expected to have a
root view controller at the end of application launch
Test Suite 'All tests' started at 2011-12-09 11:43:01 +0000
Test Suite '/Users/hermespique/Library/Developer/Xcode/DerivedData/HelloWorld-
ezilismrgmrzecbbsndapbyeczre/Build/Products/Debug-iphonesimulator/
HelloWorldTests.octest(Tests)' started at 2011-12-09 11:43:01 +0000
Test Suite 'HelloWorldTests' started at 2011-12-09 11:43:01 +0000
Test Case '-[HelloWorldTests testExample]' started.
/Users/hermespique/Documents/workspace/HelloWorld/HelloWorldTests/
HelloWorldTests.m:33: error: -[HelloWorldTests testExample] : Unit tests are not
implemented yet in HelloWorldTests
Test Case '-[HelloWorldTests testExample]' failed (0.000 seconds).
Test Suite 'HelloWorldTests' finished at 2011-12-09 11:43:01 +0000.
Executed 1 test, with 1 failure (0 unexpected) in 0.000 (0.000) seconds
Test Suite '/Users/hermespique/Library/Developer/Xcode/DerivedData/HelloWorld-
ezilismrgmrzecbbsndapbyeczre/Build/Products/Debug-iphonesimulator/
HelloWorldTests.octest(Tests)' finished at 2011-12-09 11:43:01 +0000.
Test Suite 'All tests' finished at 2011-12-09 11:43:01 +0000.

OCUnit Macros
STAssertEqualObjects(a1, a2, description, ...)
STAssertEquals(a1, a2, description, ...)
STAssertEqualsWithAccuracy(a1, a2, accuracy, description, ...)
STFail(description, ...)
STAssertNil(a1, description, ...)
STAssertNotNil(a1, description, ...)
STAssertTrue(expr, description, ...)
STAssertTrueNoThrow(expr, description, ...)
STAssertFalse(expr, description, ...)
STAssertFalseNoThrow(expr, description, ...)
STAssertThrows(expr, description, ...)
STAssertThrowsSpecific(expr, specificException, description, ...)
STAssertThrowsSpecificNamed(expr, specificException, aName, description, ...)
STAssertNoThrow(expr, description, ...)
STAssertNoThrowSpecific(expr, specificException, description, ...)
STAssertNoThrowSpecificNamed(expr, specificException, aName, description, ...)

OCUnit Macros
STAssertTrue(expr, description, ...)

STAssertFalse(expr, description, ...)

STAssertNil(a1, description, ...)

STAssertNotNil(a1, description, ...)

STAssertEqualObjects(a1, a2, description, ...)

STAssertEquals(a1, a2, description, ...)

STFail(description, ...)

STAssertThrows(expr, description, ...)

GHUnit

• Framework de Unit Testing para Obj-C
• Open-source: github.com/gabriel/gh-unit
• GUI!
• Compatible con OCUnit

#import <GHUnitIOS/GHUnit.h>

@interface ExampleTest : GHTestCase
@end

@implementation ExampleTest

- (BOOL)shouldRunOnMainThread {
return NO;
}

- (void)setUpClass {
// Run at start of all tests in the class
}

- (void)setUp {
// Run before each test method
}

- (void)tearDown {
// Run after each test method
}

- (void)tearDownClass {
// Run at end of all tests in the class
}

- (void)testFoo {
NSString *a = @"foo";
GHAssertNotNil(a, nil);
}

@end

GHUnit Macros
GHAssertNoErr(a1, description, ...) GHAssertEquals(a1, a2, description, ...)
GHAssertErr(a1, a2, description, ...) GHAbsoluteDifference(left,right)
GHAssertNotNULL(a1, description, ...) (MAX(left,right)-MIN(left,right))
GHAssertNULL(a1, description, ...) GHAssertEqualsWithAccuracy(a1, a2,
GHAssertNotEquals(a1, a2, description, ...) accuracy, description, ...)
GHAssertNotEqualObjects(a1, a2, desc, ...) GHFail(description, ...)
GHAssertOperation(a1, a2, op, GHAssertNil(a1, description, ...)
description, ...) GHAssertNotNil(a1, description, ...)
GHAssertGreaterThan(a1, a2, GHAssertTrue(expr, description, ...)
description, ...) GHAssertTrueNoThrow(expr,
GHAssertGreaterThanOrEqual(a1, a2, description, ...)
description, ...) GHAssertFalse(expr, description, ...)
GHAssertLessThan(a1, a2, description, ...) GHAssertFalseNoThrow(expr,
GHAssertLessThanOrEqual(a1, a2, description, ...)
description, ...) GHAssertThrows(expr, description, ...)
GHAssertEqualStrings(a1, a2, GHAssertThrowsSpecific(expr,
description, ...) specificException, description, ...)
GHAssertNotEqualStrings(a1, a2, GHAssertThrowsSpecificNamed(expr,
description, ...) specificException, aName,
GHAssertEqualCStrings(a1, a2, description, ...)
description, ...) GHAssertNoThrow(expr, description, ...)
GHAssertNotEqualCStrings(a1, a2, GHAssertNoThrowSpecific(expr,
description, ...) specificException, description, ...)
GHAssertEqualObjects(a1, a2, GHAssertNoThrowSpecificNamed(expr,
description, ...) specificException, aName,
description, ...)

GHUnitAsyncTestCase
#import <GHUnitIOS/GHUnit.h>

@interface AsyncTest : GHAsyncTestCase { }
@end

@implementation AsyncTest

- (void)testURLConnection {
[self prepare];

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://
www.google.com"]];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request
delegate:self startImmediately:YES];

[self waitForStatus:kGHUnitWaitStatusSuccess timeout:10.0];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[self notify:kGHUnitWaitStatusSuccess forSelector:@selector(testURLConnection)];
}

@end

Conﬁgurar GHUnit

1. Crear target
2. Agregar GHUnitiOS.framework
3. Modiﬁcar Other Linker Flags
4. Cambiar de AppDelegate

2. Agregar
GHUnitiOS.framework
• Primero debemos hacer build del framework
1. Descargar de github y descomprimir
2. > cd gh-unit/Project-iOS
3. > make

3. Modiﬁcar Other Link
Flags

• Agregar -all_load
• Agregar -objC

4. Cambiar de
AppDelegate
int main(int argc, char *argv[])
{
@autoreleasepool {
return UIApplicationMain(argc,
argv, nil, @"GHUnitIOSAppDelegate");
}
}

OCUnit vs GHUnit
OCUnit GHUnit
Integración con
Built-in Manual
XCode
Contextual /
Resultados Consola / GUI
Consola
Más macros
Programación
GHAsyncTestCase
Todo, selección o
Ejecución Todo
fallidos

Unit testing en iOS @ MobileCon Galicia

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Editor's Notes