diff --git a/python-vcversioner.changes b/python-vcversioner.changes
index b9ae5b3..101eda3 100644
--- a/python-vcversioner.changes
+++ b/python-vcversioner.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Aug 26 09:20:07 UTC 2021 - pgajdos@suse.com
+
+- %check: test the package, use %pytest rpm macro
+
 -------------------------------------------------------------------
 Tue Dec 18 23:22:32 UTC 2018 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/python-vcversioner.spec b/python-vcversioner.spec
index 847b2d2..e214d83 100644
--- a/python-vcversioner.spec
+++ b/python-vcversioner.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package python-vcversioner
 #
-# Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2021 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -25,11 +25,17 @@ License:        ISC
 Group:          Development/Languages/Python
 URL:            https://github.com/habnabit/vcversioner
 Source0:        https://files.pythonhosted.org/packages/source/v/vcversioner/vcversioner-%{version}.tar.gz
+# https://github.com/habnabit/vcversioner/issues/13
 Source1:        https://raw.githubusercontent.com/habnabit/vcversioner/%{version}/COPYING
+# https://github.com/habnabit/vcversioner/issues/13
+Source2:        https://raw.githubusercontent.com/habnabit/vcversioner/%{version}/test_vcversioner.py
 Source9:        %{name}-rpmlintrc
 BuildRequires:  %{python_module setuptools}
 BuildRequires:  fdupes
 BuildRequires:  python-rpm-macros
+# SECTION test requirements
+BuildRequires:  %{python_module pytest}
+# /SECTION
 BuildArch:      noarch
 %python_subpackages
 
@@ -40,7 +46,7 @@ VCS tag and extract a version from it.
 
 %prep
 %setup -q -n vcversioner-%{version}
-cp %{SOURCE1} .
+cp %{SOURCE1} %{SOURCE2} .
 
 %build
 %python_build
@@ -50,7 +56,7 @@ cp %{SOURCE1} .
 %python_expand %fdupes %{buildroot}%{$python_sitelib}
 
 %check
-%python_exec setup.py test
+%pytest -v
 
 %files %{python_files}
 %license COPYING
diff --git a/test_vcversioner.py b/test_vcversioner.py
new file mode 100644
index 0000000..8154dc5
--- /dev/null
+++ b/test_vcversioner.py
@@ -0,0 +1,389 @@
+# Copyright (c) Aaron Gallagher <_@habnab.it>
+# See COPYING for details.
+
+from __future__ import unicode_literals
+
+import os
+
+import pytest
+
+import vcversioner
+
+
+try:
+    unicode
+except NameError:
+    unicode = str
+
+
+class FakePopen(object):
+    def __init__(self, stdout, stderr=b''):
+        self.stdout = stdout
+        self.stderr = stderr
+
+    def communicate(self):
+        return self.stdout, self.stderr
+
+    def __call__(self, *args, **kwargs):
+        return self
+
+class RaisingFakePopen(object):
+    def __call__(self, *args, **kwargs):
+        self.args = args
+        self.kwargs = kwargs
+        raise OSError('hi!')
+
+empty = FakePopen(b'')
+invalid = FakePopen(b'foob')
+basic_version = FakePopen(b'1.0-0-gbeef')
+dev_version = FakePopen(b'1.0-2-gfeeb')
+hg_version = FakePopen(b'1.0-1-hgbeef')
+git_failed = FakePopen(b'', b'fatal: whatever')
+
+
+class FakeOpen(object):
+    def __call__(self, *args, **kwargs):
+        self.args = args
+        self.kwargs = kwargs
+        raise OSError('hi!')
+
+
+@pytest.fixture
+def gitdir(tmpdir):
+    tmpdir.chdir()
+    tmpdir.join('.git').mkdir()
+    return tmpdir
+
+@pytest.fixture
+def hgdir(tmpdir):
+    tmpdir.chdir()
+    tmpdir.join('.hg').mkdir()
+    return tmpdir
+
+
+def test_astounding_success(gitdir):
+    "Successful output from git is cached and returned."
+    version = vcversioner.find_version(Popen=basic_version)
+    assert version == ('1.0', '0', 'gbeef')
+    with gitdir.join('version.txt').open() as infile:
+        assert infile.read() == '1.0-0-gbeef'
+
+def test_no_git(gitdir):
+    "If git fails and there's no version.txt, abort."
+    with pytest.raises(SystemExit) as excinfo:
+        vcversioner.find_version(Popen=empty)
+    assert excinfo.value.args[0] == 2
+    assert not gitdir.join('version.txt').check()
+
+def test_when_Popen_raises(gitdir):
+    "If *spawning* git fails and there's no version.txt, abort."
+    with pytest.raises(SystemExit) as excinfo:
+        vcversioner.find_version(Popen=RaisingFakePopen())
+    assert excinfo.value.args[0] == 2
+    assert not gitdir.join('version.txt').check()
+
+def test_no_git_but_version_file(gitdir):
+    "If git fails but there's a version.txt, that's fine too."
+    with gitdir.join('version.txt').open('w') as outfile:
+        outfile.write('1.0-0-gbeef')
+    version = vcversioner.find_version(Popen=empty)
+    assert version == ('1.0', '0', 'gbeef')
+
+def test_Popen_raises_but_version_file(gitdir):
+    "If spawning git fails but there's a version.txt, that's similarly fine."
+    with gitdir.join('version.txt').open('w') as outfile:
+        outfile.write('1.0-0-gbeef')
+    version = vcversioner.find_version(Popen=RaisingFakePopen())
+    assert version == ('1.0', '0', 'gbeef')
+
+def test_version_file_with_root(gitdir):
+    "version.txt gets read from the project root by default."
+    with gitdir.join('version.txt').open('w') as outfile:
+        outfile.write('1.0-0-gbeef')
+    version = vcversioner.find_version(
+        root=gitdir.strpath, Popen=RaisingFakePopen())
+    assert version == ('1.0', '0', 'gbeef')
+
+def test_invalid_git(gitdir):
+    "Invalid output from git is a failure too."
+    with pytest.raises(SystemExit) as excinfo:
+        vcversioner.find_version(Popen=invalid)
+    assert excinfo.value.args[0] == 2
+    assert not gitdir.join('version.txt').check()
+
+def test_invalid_version_file(gitdir):
+    "Invalid output in version.txt is similarly a failure."
+    with gitdir.join('version.txt').open('w') as outfile:
+        outfile.write('foob')
+    with pytest.raises(SystemExit) as excinfo:
+        vcversioner.find_version(Popen=empty)
+    assert excinfo.value.args[0] == 2
+
+def test_dev_version(gitdir):
+    ".post version numbers are automatically created."
+    version = vcversioner.find_version(Popen=dev_version)
+    assert version == ('1.0.post2', '2', 'gfeeb')
+    with gitdir.join('version.txt').open() as infile:
+        assert infile.read() == '1.0-2-gfeeb'
+
+def test_dev_version_disabled(gitdir):
+    ".post version numbers can also be disabled."
+    version = vcversioner.find_version(Popen=dev_version, include_dev_version=False)
+    assert version == ('1.0', '2', 'gfeeb')
+    with gitdir.join('version.txt').open() as infile:
+        assert infile.read() == '1.0-2-gfeeb'
+
+def test_custom_vcs_args(gitdir):
+    "The command to execute to get the version can be customized."
+    popen = RaisingFakePopen()
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(Popen=popen, vcs_args=('foo', 'bar'))
+    assert popen.args[0] == ['foo', 'bar']
+
+def test_custom_vcs_args_substitutions(gitdir):
+    "The command arguments have some substitutions performed."
+    popen = RaisingFakePopen()
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(Popen=popen, vcs_args=('foo', 'bar', '%(pwd)s', '%(root)s'))
+    assert popen.args[0] == ['foo', 'bar', gitdir.strpath, gitdir.strpath]
+
+def test_custom_vcs_args_substitutions_with_different_root(tmpdir):
+    "Specifying a different root will cause that root to be substituted."
+    tmpdir.chdir()
+    popen = RaisingFakePopen()
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(Popen=popen, root='/spam', vcs_args=('%(root)s',))
+    assert popen.args[0] == ['/spam']
+
+def test_custom_version_file(gitdir):
+    "The version.txt file can have a unique name."
+    version = vcversioner.find_version(Popen=basic_version, version_file='custom.txt')
+    assert version == ('1.0', '0', 'gbeef')
+    with gitdir.join('custom.txt').open() as infile:
+        assert infile.read() == '1.0-0-gbeef'
+
+def test_custom_version_file_reading(gitdir):
+    "The custom version.txt can be read from as well."
+    with gitdir.join('custom.txt').open('w') as outfile:
+        outfile.write('1.0-0-gbeef')
+    version = vcversioner.find_version(Popen=empty, version_file='custom.txt')
+    assert version == ('1.0', '0', 'gbeef')
+
+def test_version_file_disabled(gitdir):
+    "The version.txt file can be disabled too."
+    version = vcversioner.find_version(Popen=basic_version, version_file=None)
+    assert version == ('1.0', '0', 'gbeef')
+    assert not gitdir.join('version.txt').check()
+
+def test_version_file_disabled_git_failed(gitdir):
+    "If version.txt is disabled and git fails, nothing can be done."
+    with pytest.raises(SystemExit) as excinfo:
+        vcversioner.find_version(Popen=empty, version_file=None)
+    assert excinfo.value.args[0] == 2
+    assert not gitdir.join('version.txt').check()
+
+def test_version_file_disabled_Popen_raises(gitdir):
+    "If version.txt is disabled and git fails to spawn, abort as well."
+    with pytest.raises(SystemExit) as excinfo:
+        vcversioner.find_version(Popen=RaisingFakePopen(), version_file=None)
+    assert excinfo.value.args[0] == 2
+    assert not gitdir.join('version.txt').check()
+
+def test_namedtuple(tmpdir):
+    "The output namedtuple has attribute names too."
+    tmpdir.chdir()
+    version = vcversioner.find_version(Popen=basic_version, version_file=None, vcs_args=[])
+    assert version.version == '1.0'
+    assert version.commits == '0'
+    assert version.sha == 'gbeef'
+
+def test_namedtuple_nonzero_commits(tmpdir):
+    "The output namedtuple can have a nonzero number of commits."
+    tmpdir.chdir()
+    version = vcversioner.find_version(Popen=dev_version, version_file=None, vcs_args=[])
+    assert version.version == '1.0.post2'
+    assert version.commits == '2'
+    assert version.sha == 'gfeeb'
+
+def test_version_module_paths(gitdir):
+    "Version modules can be written out too."
+    paths = ['foo.py', 'bar.py']
+    vcversioner.find_version(
+        Popen=basic_version, version_module_paths=paths)
+    for path in paths:
+        with open(path) as infile:
+            assert infile.read() == """
+# This file is automatically generated by setup.py.
+__version__ = '1.0'
+__sha__ = 'gbeef'
+__revision__ = 'gbeef'
+"""
+
+def test_git_arg_path_translation(gitdir, monkeypatch):
+    "/ is translated into the correct path separator in git arguments."
+    monkeypatch.setattr(os, 'sep', ':')
+    popen = RaisingFakePopen()
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(Popen=popen, vcs_args=['spam/eggs'], version_file=None)
+    assert popen.args[0] == ['spam:eggs']
+
+def test_version_file_path_translation(gitdir, monkeypatch):
+    "/ is translated into the correct path separator for version.txt."
+    monkeypatch.setattr(os, 'sep', ':')
+    open = FakeOpen()
+    with pytest.raises(OSError):
+        vcversioner.find_version(Popen=basic_version, open=open, version_file='spam/eggs', vcs_args=[])
+    assert open.args[0] == 'spam:eggs'
+
+def test_git_output_on_no_version_file(gitdir, capsys):
+    "The output from git is shown if it failed and the version file is disabled."
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(Popen=git_failed, version_file=None, vcs_args=[])
+    out, err = capsys.readouterr()
+    assert not err
+    assert out == (
+        'vcversioner: [] failed.\n'
+        'vcversioner: -- VCS output follows --\n'
+        'vcversioner: fatal: whatever\n')
+
+def test_git_output_on_version_file_absent(gitdir, capsys):
+    "The output from git is shown if it failed and the version file doesn't exist."
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(Popen=git_failed, version_file='version.txt', vcs_args=[])
+    out, err = capsys.readouterr()
+    assert not err
+    assert out == (
+        "vcversioner: [] failed and %r isn't present.\n"
+        'vcversioner: are you installing from a github tarball?\n'
+        'vcversioner: -- VCS output follows --\n'
+        'vcversioner: fatal: whatever\n' % ('version.txt',))
+
+def test_git_output_on_version_unparsable(gitdir, capsys):
+    "The output from git is shown if it failed and the version couldn't be parsed."
+    gitdir.join('version.txt').write('doof')
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(Popen=git_failed, version_file='version.txt', vcs_args=[])
+    out, err = capsys.readouterr()
+    assert not err
+    assert out == (
+        "vcversioner: %r (from %r) couldn't be parsed into a version.\n"
+        'vcversioner: -- VCS output follows --\n'
+        'vcversioner: fatal: whatever\n' % ('doof', 'version.txt'))
+
+def test_no_git_output_on_version_unparsable(capsys):
+    "The output from git is not shown if git succeeded but the version couldn't be parsed."
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(Popen=invalid, version_file='version.txt', vcs_args=[])
+    out, err = capsys.readouterr()
+    assert not err
+    assert out == (
+        "vcversioner: %r (from VCS) couldn't be parsed into a version.\n" % ('foob',))
+
+def test_no_output_on_success(gitdir, capsys):
+    "There is no output if everything succeeded."
+    vcversioner.find_version(Popen=basic_version)
+    out, err = capsys.readouterr()
+    assert not out
+    assert not err
+
+def test_no_output_on_version_file_success(gitdir, capsys):
+    "There is no output if everything succeeded, even if the version was read from a version file."
+    gitdir.join('version.txt').write('1.0-0-gbeef')
+    vcversioner.find_version(Popen=git_failed)
+    out, err = capsys.readouterr()
+    assert not out
+    assert not err
+
+def test_strip_leading_v(gitdir):
+    "Leading 'v's are stripped from tags."
+    version = vcversioner.find_version(Popen=FakePopen(b'v1.0-0-gbeef'))
+    assert version == ('1.0', '0', 'gbeef')
+
+def test_strip_leading_prefix(gitdir):
+    "The leading prefix stripped from tags can be customized."
+    version = vcversioner.find_version(Popen=FakePopen(b'debian/1.0-0-gbeef'), strip_prefix='debian/')
+    assert version == ('1.0', '0', 'gbeef')
+
+def test_git_args_deprecation(gitdir):
+    "git_args is deprecated."
+    pytest.deprecated_call(vcversioner.find_version, git_args=['git', 'spam'], Popen=basic_version)
+
+def test_git_args_still_works(gitdir):
+    "git_args still works like vcs_args."
+    popen = RaisingFakePopen()
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(git_args=['git', 'spam'], Popen=popen)
+    assert popen.args[0] == ['git', 'spam']
+
+def test_hg_detection(hgdir):
+    ".hg directories get detected and the appropriate hg command gets run."
+    popen = RaisingFakePopen()
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(Popen=popen)
+    assert popen.args[0] == [
+        'hg', 'log', '-R', hgdir.strpath, '-r', '.', '--template',
+        '{latesttag}-{latesttagdistance}-hg{node|short}']
+
+def test_no_vcs_no_version_file(tmpdir, capsys):
+    "If no VCS is detected with no version_file, vcversioner aborts."
+    tmpdir.chdir()
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(version_file=None, Popen=basic_version)
+    out, err = capsys.readouterr()
+    assert not err
+    assert out == (
+        'vcversioner: no VCS could be detected in %r.\n' % (unicode(tmpdir.strpath),))
+
+def test_no_vcs_absent_version_file(tmpdir, capsys):
+    "If no VCS is detected with an absent version_file, vcversioner aborts."
+    tmpdir.chdir()
+    with pytest.raises(SystemExit):
+        vcversioner.find_version(version_file='version.txt', Popen=basic_version)
+    out, err = capsys.readouterr()
+    assert not err
+    assert out == (
+        "vcversioner: no VCS could be detected in %r and %r isn't present.\n"
+        "vcversioner: are you installing from a github tarball?\n" % (
+            unicode(tmpdir.strpath), 'version.txt'))
+
+def test_decrement_dev_version(gitdir):
+    "decrement_dev_version will subtract one from the number of commits."
+    version = vcversioner.find_version(decrement_dev_version=True, Popen=dev_version)
+    assert version == ('1.0.post1', '1', 'gfeeb')
+
+def test_decrement_dev_version_to_zero(gitdir):
+    "decrement_dev_version with one commit will produce a non-dev version number."
+    version = vcversioner.find_version(decrement_dev_version=True, Popen=FakePopen(b'1.0-1-gbeef'))
+    assert version == ('1.0', '0', 'gbeef')
+
+def test_automatic_decrement_dev_version_with_hg(hgdir):
+    "decrement_dev_version gets turned on automatically with hg revisions."
+    version = vcversioner.find_version(Popen=hg_version)
+    assert version == ('1.0', '0', 'hgbeef')
+
+def test_automatic_decrement_dev_version_disabled(hgdir):
+    "decrement_dev_version does not get turned on automatically if explicitly disabled."
+    version = vcversioner.find_version(decrement_dev_version=False, Popen=hg_version)
+    assert version == ('1.0.post1', '1', 'hgbeef')
+
+def test_version_file_substituted_with_no_vcs(tmpdir):
+    "The version file is substituted even if no VCS is present."
+    tmpdir.chdir()
+    tmpdir.join('version.txt').write('1.0-0-gbeef')
+    version = vcversioner.find_version(Popen=empty)
+    assert version == ('1.0', '0', 'gbeef')
+
+
+class Struct(object):
+    pass
+
+def test_setup_astounding_success(tmpdir):
+    "``find_version`` can be called through distutils too."
+    tmpdir.chdir()
+    dist = Struct()
+    dist.metadata = Struct()
+    vcversioner.setup(
+        dist, 'vcversioner',
+        {str('Popen'): basic_version, str('version_file'): None,
+         str('vcs_args'): []})
+    assert dist.metadata.version == '1.0'