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diff --git a/src/dateutil/test/test_internals.py b/src/dateutil/test/test_internals.py
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+++ b/src/dateutil/test/test_internals.py
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+# -*- coding: utf-8 -*-
+"""
+Tests for implementation details, not necessarily part of the user-facing
+API.
+
+The motivating case for these tests is #483, where we want to smoke-test
+code that may be difficult to reach through the standard API calls.
+"""
+
+import sys
+import pytest
+
+from dateutil.parser._parser import _ymd
+from dateutil import tz
+
+IS_PY32 = sys.version_info[0:2] == (3, 2)
+
+
+@pytest.mark.smoke
+def test_YMD_could_be_day():
+    ymd = _ymd('foo bar 124 baz')
+
+    ymd.append(2, 'M')
+    assert ymd.has_month
+    assert not ymd.has_year
+    assert ymd.could_be_day(4)
+    assert not ymd.could_be_day(-6)
+    assert not ymd.could_be_day(32)
+
+    # Assumes leap year
+    assert ymd.could_be_day(29)
+
+    ymd.append(1999)
+    assert ymd.has_year
+    assert not ymd.could_be_day(29)
+
+    ymd.append(16, 'D')
+    assert ymd.has_day
+    assert not ymd.could_be_day(1)
+
+    ymd = _ymd('foo bar 124 baz')
+    ymd.append(1999)
+    assert ymd.could_be_day(31)
+
+
+###
+# Test that private interfaces in _parser are deprecated properly
+@pytest.mark.skipif(IS_PY32, reason='pytest.warns not supported on Python 3.2')
+def test_parser_private_warns():
+    from dateutil.parser import _timelex, _tzparser
+    from dateutil.parser import _parsetz
+
+    with pytest.warns(DeprecationWarning):
+        _tzparser()
+
+    with pytest.warns(DeprecationWarning):
+        _timelex('2014-03-03')
+
+    with pytest.warns(DeprecationWarning):
+        _parsetz('+05:00')
+
+
+@pytest.mark.skipif(IS_PY32, reason='pytest.warns not supported on Python 3.2')
+def test_parser_parser_private_not_warns():
+    from dateutil.parser._parser import _timelex, _tzparser
+    from dateutil.parser._parser import _parsetz
+
+    with pytest.warns(None) as recorder:
+        _tzparser()
+        assert len(recorder) == 0
+
+    with pytest.warns(None) as recorder:
+        _timelex('2014-03-03')
+
+        assert len(recorder) == 0
+
+    with pytest.warns(None) as recorder:
+        _parsetz('+05:00')
+        assert len(recorder) == 0
+
+
+@pytest.mark.tzstr
+def test_tzstr_internal_timedeltas():
+    with pytest.warns(tz.DeprecatedTzFormatWarning):
+        tz1 = tz.tzstr("EST5EDT,5,4,0,7200,11,-3,0,7200")
+
+    with pytest.warns(tz.DeprecatedTzFormatWarning):
+        tz2 = tz.tzstr("EST5EDT,4,1,0,7200,10,-1,0,7200")
+
+    assert tz1._start_delta != tz2._start_delta
+    assert tz1._end_delta != tz2._end_delta