iOS asserting NSMutableArray contains 2 objects, regardless of index - objective-c

Question

I have the following test case in my iOS application :
-(void) testTwoDefaultUsersExist
{
NSString * expected;
NSString * actual;
expected = #"John Smith";
actual = [[[userService getAllUsers]objectAtIndex:0] fullName];
STAssertEqualObjects(expected, actual, #"Not equal");
expected = #"Dave Brown";
actual = [[[userService getAllUsers]objectAtIndex:1] fullName];
STAssertEqualObjects(expected, actual, #"Not equal");
}
The above just checks that my call to [userService getAllUsers] returns 2 User objects, one with a name of John Smith, the other with Dave Brown. This appears to work fine for this scenario, but I have other cases where that ordering may change, so John may be placed in index 1 rather than 0
Question : How can I assert that the NSMutableArray, being returned from the call to [userService getAllUsers] contains those 2 objects, regardless of ordering?

Answer 1

Can you not simply use the NSArray method -containsObject:? An NSMutableArray is still an NSArray, so you can do:
NSArray * expected = [NSArray arrayWithObjects:#"John Smith", #"Dave Brown", nil];
NSArray * actual = [[userService getAllUsers] valueForKey:#"fullName"];
for(NSString * name in expected) {
STAssertTrue([actual containsObject:name], #"Missing name");
}
Note the (ab)use of -valueForKey: to transform an array of user objects into an array of NSString objects, making the -containsObject: call simpler. This will only work if your user object is key-value coding compliant for the fullName property.

Answer 2

NSMutableArray always contains the elements as you insert them to the array
You can iterate over the elements that you insert and test if they're at the NSArray using:
- (NSUInteger)indexOfObject:(id)anObject
If the object is not found it returns NSNotFound, that can be used with the Unit Test Framework that you choice
Greetings

Answer 3

Assert on equality like this
NSAssert1([userService getAllUsers].count == 2, #"SomeDescription", nil);
If you want to search an array for the existence of some strings, use the following function
- (BOOL) containsAllNames:(NSArray*)arrToSearch namesToSearch:(NSArray*)arr
{
BOOL containsAll = YES;
for (NSString *name in arr) {
BOOL containsCurrent = NO;
for (NSString *nameToSearch in arrToSearch) {
if ([name isEqualToString:nameToSearch]) {
containsCurrent = YES;
break;
}
}
if (!containsCurrent) {
containsAll = NO;
}
}
return containsAll;
}
Call it like
NSArray *toSearch = [NSArray arrayWithObjects:#"John Smith", #"Dave Brown", nil];
[self containsAllNames:YourArray namesToSearch:toSearch];