An example of using shared Specta behavior

OrderedCollectionSpec

SharedExamplesBegin(OrderedCollectionBehavior)

// A set of shared test cases are defined here under the key name
// "an ordered collection".
//
// The dictionary param is the only means of providing data from
// the shared examples caller to the set of shared examples.
// In this case pass in the collection class to be tested.
sharedExamplesFor(@"an ordered collection", ^(NSDictionary* data)
{
   // Pull the class to test out of the data object
   Class collectionClass = data[@"collectionClass"];

   it(@"should be empty when first created",
   ^{
      id collection = [[collectionClass alloc] init];
      expect([collection count]).to.equal(0);
   });

   it(@"should allowing initializing with a contained object",
   ^{
      expect(
      ^{
         (void) [[collectionClass alloc] initWithObject:@"foo"];
      }).notTo.raise(nil);
   });

   it(@"should reply to first with the object provided during init",
   ^{
      NSString* object = @"foo";
      id collection = [[collectionClass alloc] initWithObject:object];
      expect([collection firstObject]).to.equal(object);
   });
});

SharedExamplesEnd


// Here's one instance of a spec making use of the shared behavior.
// Test that an array behaves like an ordered collection.
SpecBegin(NSArray)

describe(@"shared array behavior",
^{
   NSDictionary* data = @{@"collectionClass": [NSArray class]};
   itShouldBehaveLike(@"an ordered collection", data);
});

SpecEnd


// And here's a second instance of a spec making use of
// the shared behavior. Test that an ordered set behaves
// like an ordered collection.
SpecBegin(NSOrderedSet)

describe(@"shared ordered set behavior",
^{
   NSDictionary* data = @{@"collectionClass": [NSOrderedSet class]};
   itShouldBehaveLike(@"an ordered collection", data);
});

SpecEnd