diff --git a/mmpose/__init__.py b/mmpose/__init__.py
index df71926da6..c5ddeb65a8 100644
--- a/mmpose/__init__.py
+++ b/mmpose/__init__.py
@@ -6,8 +6,8 @@
 
 from .version import __version__, short_version
 
-mmcv_minimum_version = '1.3.8'
-mmcv_maximum_version = '1.5.0'
+MMCV_MIN = '1.3.8'
+MMCV_MAX = '1.5.0'
 
 
 def digit_version(version_str: str, length: int = 4):
@@ -51,9 +51,9 @@ def digit_version(version_str: str, length: int = 4):
 mmcv_version = digit_version(mmcv.__version__)
 version_info = parse_version_info(__version__)
 
-assert (mmcv_version >= digit_version(mmcv_minimum_version)
-        and mmcv_version <= digit_version(mmcv_maximum_version)), \
+assert (mmcv_version >= digit_version(MMCV_MIN)
+        and mmcv_version <= digit_version(MMCV_MAX)), \
     f'MMCV=={mmcv.__version__} is used but incompatible. ' \
-    f'Please install mmcv>={mmcv_minimum_version}, <={mmcv_maximum_version}.'
+    f'Please install mmcv>={MMCV_MIN}, <={MMCV_MAX}.'
 
-__all__ = ['__version__', 'short_version', 'version_info']
+__all__ = ['__version__', 'short_version', 'version_info', 'digit_version']
diff --git a/tests/test_version.py b/tests/test_version.py
index 080a88956d..febf4ea2db 100644
--- a/tests/test_version.py
+++ b/tests/test_version.py
@@ -1,12 +1,28 @@
-import mmcv
-
 import mmpose
+from mmpose import digit_version
 
 
 def test_version():
     version = mmpose.__version__
-    mmcv_version = mmpose.digit_version(mmcv.__version__)
     assert isinstance(version, str)
     assert isinstance(mmpose.short_version, str)
     assert mmpose.short_version in version
-    assert mmcv_version == mmpose.mmcv_version
+
+
+def test_digit_version():
+    assert digit_version('0.2.16') == (0, 2, 16, 0, 0, 0)
+    assert digit_version('1.2.3') == (1, 2, 3, 0, 0, 0)
+    assert digit_version('1.2.3rc0') == (1, 2, 3, 0, -1, 0)
+    assert digit_version('1.2.3rc1') == (1, 2, 3, 0, -1, 1)
+    assert digit_version('1.0rc0') == (1, 0, 0, 0, -1, 0)
+    assert digit_version('1.0') == digit_version('1.0.0')
+    assert digit_version('1.5.0+cuda90_cudnn7.6.3_lms') == digit_version('1.5')
+    assert digit_version('1.0.0dev') < digit_version('1.0.0a')
+    assert digit_version('1.0.0a') < digit_version('1.0.0a1')
+    assert digit_version('1.0.0a') < digit_version('1.0.0b')
+    assert digit_version('1.0.0b') < digit_version('1.0.0rc')
+    assert digit_version('1.0.0rc1') < digit_version('1.0.0')
+    assert digit_version('1.0.0') < digit_version('1.0.0post')
+    assert digit_version('1.0.0post') < digit_version('1.0.0post1')
+    assert digit_version('v1') == (1, 0, 0, 0, 0, 0)
+    assert digit_version('v1.1.5') == (1, 1, 5, 0, 0, 0)