### Question:
TaskID extends org.apache.hadoop.mapred.ID { @Override public String toString() { return appendTo(new StringBuilder(TASK)).toString(); } TaskID(JobID jobId, TaskType type, int id);  TaskID(String jtIdentifier, int jobId, TaskType type, int id); @Deprecated  TaskID(JobID jobId, boolean isMap, int id); @Deprecated  TaskID(String jtIdentifier, int jobId, boolean isMap, int id);  TaskID(); JobID getJobID(); @Deprecated boolean isMap(); TaskType getTaskType(); @Override boolean equals(Object o); @Override int compareTo(ID o); @Override String toString(); @Override int hashCode(); @Override void readFields(DataInput in); @Override void write(DataOutput out); static TaskID forName(String str); static char getRepresentingCharacter(TaskType type); static TaskType getTaskType(char c); static String getAllTaskTypes(); static final String TASK_ID_REGEX; static final Pattern taskIdPattern; }### Answer:
@Test public void testToString() { JobID jobId = new JobID("1234", 1); for (TaskType type : TaskType.values()) { TaskID taskId = new TaskID(jobId, type, 0); String str = String.format("task_1234_0001_%c_000000", TaskID.getRepresentingCharacter(type)); assertEquals("The toString() method returned the wrong value", str, taskId.toString()); } }