This test method for validating a specification of a graphical interface consists of developing a scenario file corresponding to the validation test to be performed. The scenario file includes a plurality of instructions, in a natural programming language, each instruction including a function, parameters and an expected state of the graphical interface following the application of the function. The test is automatically performed by interpreting the scenario file so as to generate commands intended for an engine capable of interacting with the graphical interface and monitoring the evolution of its current state, and then analyzing a result file associating each instruction of the scenario file with a result corresponding to the comparison of the current state of the graphical interface following the application of the corresponding command with the expected state.