add regression test for callable use_scm_version

Signed-off-by: Esben Haabendal <[email protected]>

Author: esben

testing/test_regressions.py

@@ -23,3 +23,23 @@ def test_pkginfo_noscmroot(tmpdir, monkeypatch):
     do('git init', p.dirpath())
     res = do('python setup.py --version', p)
     assert res == '1.0'
+
+
+def test_use_scm_version_callable(tmpdir, monkeypatch):
+    """use of callable as use_scm_version argument"""
+    monkeypatch.delenv("SETUPTOOLS_SCM_DEBUG")
+
+    p = tmpdir.ensure('sub/package', dir=1)
+    p.join('setup.py').write(
+        '''from setuptools import setup
+def vcfg():
+    from setuptools_scm.version import guess_next_dev_version
+    def vs(v):
+        return guess_next_dev_version(v)
+    return {"version_scheme": vs}
+setup(use_scm_version=vcfg)
+''')
+    p.join("PKG-INFO").write('Version: 1.0')
+
+    res = do('python setup.py --version', p)
+    assert res == '1.0'