public void aUserCanAssignALiveCellAtAGivenPointInTheGrid() {
String seededGrid = "..." + NEW_LINE + "..." + NEW_LINE + "..." + NEW_LINE + "";
String expectedState = "*.." + NEW_LINE + "*.." + NEW_LINE + ".*." + NEW_LINE + "";
Universe theUniverse = new Universe(seededWith(seededGrid));
theUniverse.setLiveCellAt(0, 0);
theUniverse.setLiveCellAt(1, 0);
theUniverse.setLiveCellAt(2, 1);
assertThat(theUniverse.getGrid(), is(expectedState));
}