Add Experimental filters for smudging/cleaning the SOA serial

test_dzonegit.py

@@ -332,3 +332,42 @@ def test_get_zone_wildcards():
         "a.long.zone.name", "*.long.zone.name",
         "*.zone.name", "*.name", "*",
     ]
+
+
+def test_smudge_serial(capsys):
+    stdin = StringIO("""
+@ 60 IN SOA ns hm (
+                60 ; serial
+                60 ; refresh
+                60 ; retry
+                60 ; expire
+                60 ; minimum
+                )
+  60 NS ns.example.org.
+""")
+    dzonegit.smudge_serial(stdin)
+    stdout = capsys.readouterr().out
+
+    assert "{}60 ; serial".format(dzonegit.SERIAL_SMUDGE_TAG) in stdout
+    stdin = StringIO(stdout)
+    dzonegit.smudge_serial(stdin)
+    assert stdout == capsys.readouterr().out
+
+
+def test_clean_serial(capsys):
+    stdin = StringIO("""
+@ 60 IN SOA ns hm (
+                {}60 ; serial
+                60 ; refresh
+                60 ; retry
+                60 ; expire
+                60 ; minimum
+                )
+  60 NS ns.example.org.
+""".format(dzonegit.SERIAL_SMUDGE_TAG))
+    dzonegit.clean_serial(stdin)
+    stdout = capsys.readouterr().out
+    assert " 61 ; serial" in stdout
+    stdin = StringIO(stdout)
+    dzonegit.clean_serial(stdin)
+    assert stdout == capsys.readouterr().out