text: #import "ARValueTransformer.h"
  
  SpecBegin(ARValueTransformerSpec);
  
  typedef NS_ENUM(NSInteger, TestFeatureType) {
      TestFeatureOne,
      TestFeatureTwo,
      TestFeatureThree
  };
  
  NSDictionary *featureTypes = @{
      @"one" : @(TestFeatureOne),
      @"two" : @(TestFeatureTwo),
      @"three" : @(TestFeatureThree)
  };
  
  __block MTLValueTransformer *transformer = nil;
  
  describe(@"without default", ^{
      beforeEach(^{
          transformer = [ARValueTransformer enumValueTransformerWithMap:featureTypes];
      });
      it(@"transforms a known value", ^{
          expect([transformer transformedValue:@"one"]).to.equal(TestFeatureOne);
      });
      it(@"returns nil for an unknown value", ^{
          expect([transformer transformedValue:@"unknown"]).to.beNil;
      });
      it(@"returns nil for nil", ^{
          expect([transformer transformedValue:nil]).to.beNil;
      });
  });
  
  SpecEnd;
  