### Question:
BnButton extends OperationPMButton implements ModelSubscriber { public void setPath(Path path) { this.link.setPath(path); } BnButton();  BnButton(IOperationPM pModel);  BnButton(ModelProvider provider, Path path);  BnButton(ModelProvider provider); IModelProvider getModelProvider(); void setModelProvider(IModelProvider provider); Path getPath(); void setPath(Path path);  }### Answer:
@Test public void testSetPath() { this.provider.setPresentationModel(this.testModel); this.button.setPath(new Path("this.op")); this.button.setModelProvider(this.provider); assertNotNull("button.getOperation()", this.button.getPresentationModel()); }