     
     func test_givenNoRegistration_whenUnregisterForType_thenNoTypes() {
         sut.unregisterService(for: String.self)
-        XCTAssertEqual(sut.types, Set<String>())
+        XCTAssertTrue(sut.types.isEmpty)
     }
 }

    func test_givenNoRegistration_whenUnRegisterAll_thenNoTypes() {
        sut.unregisterAll()
        let result = sut.types
        XCTAssertEqual(result, Set<String>())
    }
    
    func test_givenRegistration2Service_whenUnregisterAll_thenNoTypesNorInstance() {

        let stringService = sut.service(for:String.self)
        let stringableService = sut.service(for:Stringable.self)
        
        XCTAssertTrue(result.isEmpty)
        XCTAssertNil(stringService)
        XCTAssertNil(stringableService)
    }
