### Question:
WroModelInspector { public String getGroupNamesAsString() { return String.format("%s", StringUtils.join(getGroupNames(), ", ")); } WroModelInspector(final WroModel model); Group getGroupByName(final String name); Collection<String> getGroupNamesContainingResource(final String resourceUri); final List<String> getGroupNames(); boolean hasGroup(final String groupName); String getGroupNamesAsString(); Collection<Resource> getAllUniqueResources(); Collection<Resource> getAllResources();  }### Answer:
@Test public void shouldGetGroupNamesAsString() { assertEquals("g1, g2, g3", victim.getGroupNamesAsString()); }