diff --git a/lib/nats_bench/__init__.py b/lib/nats_bench/__init__.py
index 050aae7..0702d52 100644
--- a/lib/nats_bench/__init__.py
+++ b/lib/nats_bench/__init__.py
@@ -12,7 +12,8 @@ from nats_bench.api_utils import pickle_save
 from nats_bench.api_utils import ResultsCount
 
 
-NATS_BENCH_API_VERSIONs = ['v1.0']    # [2020.08.31]
+NATS_BENCH_API_VERSIONs = ['v1.0',    # [2020.08.31]
+                           'v1.1']    # [2020.12.20] adding unit tests
 NATS_BENCH_SSS_NAMEs = ('sss', 'size')
 NATS_BENCH_TSS_NAMEs = ('tss', 'topology')
 
diff --git a/lib/nats_bench/api_test.py b/lib/nats_bench/api_test.py
index a30118f..39a8de2 100644
--- a/lib/nats_bench/api_test.py
+++ b/lib/nats_bench/api_test.py
@@ -3,28 +3,69 @@
 ##############################################################################
 # NATS-Bench: Benchmarking NAS algorithms for Architecture Topology and Size #
 ##############################################################################
+# pytest --capture=tee-sys                                                   #
+##############################################################################
 """This file is used to quickly test the API."""
+import os
+import pytest
 import random
 
 from nats_bench.api_size import NATSsize
+from nats_bench.api_size import ALL_BASE_NAMES as sss_base_names
 from nats_bench.api_topology import NATStopology
+from nats_bench.api_topology import ALL_BASE_NAMES as tss_base_names
 
 
-def test_nats_bench_tss(benchmark_dir):
-  return test_nats_bench(benchmark_dir, True)
+def get_fake_torch_home_dir():
+  return os.environ['FAKE_TORCH_HOME']
 
 
-def test_nats_bench_sss(benchmark_dir):
-  return test_nats_bench(benchmark_dir, False)
+class TestNATSBench(object):
 
+  def test_nats_bench_tss(self, benchmark_dir=None, fake_random=True):
+    if benchmark_dir is None:
+      benchmark_dir = os.path.join(get_fake_torch_home_dir(), sss_base_names[-1] + '-simple')
+    return _test_nats_bench(benchmark_dir, True, fake_random)
 
-def test_nats_bench(benchmark_dir, is_tss, verbose=False):
+  def test_nats_bench_sss(self, benchmark_dir=None, fake_random=True):
+    if benchmark_dir is None:
+      benchmark_dir = os.path.join(get_fake_torch_home_dir(), tss_base_names[-1] + '-simple')
+    return _test_nats_bench(benchmark_dir, False, fake_random)
+
+  def test_01_th_issue(self):
+    # Link: https://github.com/D-X-Y/NATS-Bench/issues/1
+    print('')
+    tss_benchmark_dir = os.path.join(get_fake_torch_home_dir(), sss_base_names[-1] + '-simple')
+    api = NATStopology(tss_benchmark_dir, True, False)
+    # The performance of 0-th architecture on CIFAR-10 (trained by 12 epochs)
+    info = api.get_more_info(0, 'cifar10', hp=12)
+    print('The loss on the training set of CIFAR-10: {:}'.format(info['train-loss']))
+    print('The total training time for 12 epochs on CIFAR-10: {:}'.format(info['train-all-time']))
+    print('The per-epoch training time on CIFAR-10: {:}'.format(info['train-per-time']))
+    print('The total evaluation time on the test set of CIFAR-10 for 12 times: {:}'.format(info['test-all-time']))
+    print('The evaluation time on the test set of CIFAR-10: {:}'.format(info['test-per-time']))
+    # Please note that the splits of train/validation/test on CIFAR-10 in our NATS-Bench paper is different from the original CIFAR paper.
+    cost_info = api.get_cost_info(0, 'cifar10')
+    xkeys = ['T-train@epoch',     # The per epoch training cost for CIFAR-10. Note that the training set of CIFAR-10 in NATS-Bench is a subset of the original training set in CIFAR paper.
+             'T-train@total',
+             'T-ori-test@epoch',  # The time cost for the evaluation on the original test split of CIFAR-10, which is the validation + test sets of CIFAR-10 on NATS-Bench.
+             'T-ori-test@total']  # T-ori-test@epoch * 12 times.
+    for xkey in xkeys:
+      print('The cost info [{:}] for 0-th architecture on CIFAR-10 is {:}'.format(xkey, cost_info[xkey]))
+ 
+
+def _test_nats_bench(benchmark_dir, is_tss, fake_random, verbose=False):
+  """The main test entry for NATS-Bench."""
   if is_tss:
     api = NATStopology(benchmark_dir, True, verbose)
   else:
     api = NATSsize(benchmark_dir, True, verbose)
 
-  test_indexes = [random.randint(0, len(api) - 1) for _ in range(10)]
+  if fake_random:
+    test_indexes = [0, 11, 241]
+  else:
+    test_indexes = [random.randint(0, len(api) - 1) for _ in range(10)]
+
   key2dataset = {'cifar10': 'CIFAR-10',
                  'cifar100': 'CIFAR-100',
                  'ImageNet16-120': 'ImageNet16-120'}
@@ -57,3 +98,6 @@ def test_nats_bench(benchmark_dir, is_tss, verbose=False):
 
     # Show the information of the `index`-th architecture
     api.show(index)
+
+  with pytest.raises(ValueError):
+    api.get_more_info(100000, 'cifar10')