anchor.diff:            },
             validator: (resolver) {
               var lib = resolver.getLibrary(entryPoint);
  -            expect(lib.importedLibraries.length, 2);
  +            expect(lib.importedLibraries, hasLength(2));
               var libA = lib.importedLibraries.where((l) => l.name == 'a').single;
               expect(libA.getType('Foo'), isNotNull);
             });
  
positive.code:           },
            validator: (resolver) {
              var lib = resolver.getLibrary(entryPoint);
              expect(lib.importedLibraries.length, 1);
            });
      });
  
  
negative.code:           ],
            validator: (resolver) {
              var lib = resolver.getLibrary(entryPoint);
              expect(lib.importedLibraries, hasLength(2));
            });
      });
  
  