         
         describe("Assembler lazy build") {
             it("can assembly a single container") {
-                let assembler = try! Assembler(assemblies: [])
+                let assembler = Assembler([])
                 var cat = assembler.resolver.resolve(Animal.self)
                 expect(cat).to(beNil())
                 

            }
            
            it("can assembly a multiple containers at once") {
                let assembler = try! Assembler(assemblies: [])
                var cat = assembler.resolver.resolve(Animal.self)
                expect(cat).to(beNil())
                

        
        describe("Assembler basic init") {
            it("can assembly a single container") {
                let assembler = Assembler([
                    AnimalAssembly()
                ])
                let cat = assembler.resolver.resolve(Animal.self)
