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Article Written By:
Johann Dowa

Objective-C Library Of Matcher Objects For OCUnit, GHUnit, Cedar, More For Easier Testing

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There are many different unit testing frameworks available for the iOS platform, and OCUnit included within Xcode is terrific for most cases.

Today I came across a great library for anyone working with OCUnit (and several other frameworks) providing a library of matchers for building test expressions covering many situations saving you a lot  of time, and providing a framework to make it easier to create your own test expressions.

Hamcrest works with the iOS Unit testing frameworks OCUnit, Google Toolbox for Mac, GHUnit, Cedar, and OCMock , and OCHandMock.

Here’s a list of the predefined matchers from the Hamcrest wiki:

  • Object
    • conformsTo – match object that conforms to protocol
    • equalTo – match equal object
    • hasDescription – match object’s -description
    • hasProperty – match return value of method with given name
    • instanceOf – match object type
    • nilValuenotNilValue – match nil, or not nil
    • sameInstance – match same object
  • Number
    • closeTo – match number close to a given value
    • equalTo<TypeName> – match number equal to a primitive number (such as equalToInt for an int)
    • greaterThangreaterThanOrEqualTolessThanlessThanOrEqualTo – match numeric ordering
  • Text
    • containsString – match part of a string
    • endsWith – match the end of a string
    • equalToIgnoringCase – match the complete string but ignore case
    • equalToIgnoringWhitespace – match the complete string but ignore extra whitespace
    • startsWith – match the beginning of a string
    • stringContainsInOrder – match parts of a string, in relative order
  • Logical
    • allOf – “and” together all matchers
    • anyOf – “or” together all matchers
    • anything – match anything (useful in composite matchers when you don’t care about a particular value)
    • isNot – negate the matcher
  • Collection
    • contains – exactly match the entire collection
    • containsInAnyOrder – match the entire collection, but in any order
    • empty – match empty collection
    • hasCount – match number of elements against another matcher
    • hasCountOf – match collection with given number of elements
    • hasEntries – match dictionary with list of key-value pairs
    • hasEntry – match dictionary containing a key-value pair
    • hasItem – match if given item appears in the collection
    • hasItems – match if all given items appear in the collection, in any order
    • hasKey – match dictionary with a key
    • hasValue – match dictionary with a value
    • onlyContains – match if collections’s items appear in given list
  • Decorator
    • describedAs – give the matcher a custom failure description
    • is – decorator to improve readability – see Syntactic sugar below

You can find Hamcrest on Google code here and the Objective-C wiki can be found here.

A nice time saver for building unit tests.


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