### Question:
ModuleOwnedButton extends Button implements ModuleOwned { @Override @EventStation public String getOwnerModule() { return ownerModule; } ModuleOwnedButton(String ownerModule); @Override @EventStation String getOwnerModule();  }### Answer:
@Test public void nullArg() { ModuleOwnedButton victim = new ModuleOwnedButton(null); assertNotNull(victim.getOwnerModule()); assertEquals(StringUtils.EMPTY, victim.getOwnerModule()); }
@Test public void notNullArg() { ModuleOwnedButton victim = new ModuleOwnedButton("Chuck"); assertEquals("Chuck", victim.getOwnerModule()); }