diff --git a/README.rst b/README.rst
index 398bebb..3201454 100644
--- a/README.rst
+++ b/README.rst
@@ -4,6 +4,10 @@
 .. image:: https://img.shields.io/pypi/status/grafanimate.svg
     :target: https://pypi.org/project/grafanimate/
 
+.. image:: https://codecov.io/gh/grafana-toolbox/grafanimate/branch/main/graph/badge.svg
+    :target: https://codecov.io/gh/grafana-toolbox/grafanimate
+    :alt: Code coverage
+
 .. image:: https://img.shields.io/pypi/l/grafanimate.svg
     :alt: License
     :target: https://pypi.org/project/grafanimate/
diff --git a/tests/test_model.py b/tests/test_model.py
index a860cd7..a6cff2c 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -1,11 +1,14 @@
+import re
 from datetime import datetime, timezone
 
+import pytest
 from dateutil.relativedelta import relativedelta
 from dateutil.rrule import DAILY, MINUTELY
 from dateutil.tz import tzutc
 from freezegun import freeze_time
 
 from grafanimate.model import AnimationScenario, AnimationSequence, SequencingMode
+from grafanimate.timeutil import RecurrenceInfo
 
 
 def test_sequence_datetime():
@@ -173,6 +176,60 @@ def test_sequence_relative_with_now():
     ]
 
 
+@freeze_time("2021-11-19T20:34:17Z")
+def test_sequence_recurrence():
+    seq = AnimationSequence(
+        start="-7d",
+        stop="now",
+        recurrence=RecurrenceInfo(
+            frequency=DAILY, interval=1, duration=relativedelta(days=+1, seconds=-1)
+        ),
+    )
+
+    assert seq.start == datetime(2021, 11, 12, 20, 34, 17, tzinfo=tzutc())
+    assert seq.stop == datetime(2021, 11, 19, 20, 34, 17, tzinfo=tzutc())
+
+    assert seq.recurrence.every is None
+    assert seq.recurrence.frequency == DAILY
+    assert seq.recurrence.interval == 1
+    assert seq.recurrence.duration == relativedelta(days=+1, seconds=-1)
+
+    assert list(seq.get_timeranges_isoformat()) == [
+        "2021-11-12T20:34:17+00:00/2021-11-13T20:34:16+00:00",
+        "2021-11-13T20:34:17+00:00/2021-11-14T20:34:16+00:00",
+        "2021-11-14T20:34:17+00:00/2021-11-15T20:34:16+00:00",
+        "2021-11-15T20:34:17+00:00/2021-11-16T20:34:16+00:00",
+        "2021-11-16T20:34:17+00:00/2021-11-17T20:34:16+00:00",
+        "2021-11-17T20:34:17+00:00/2021-11-18T20:34:16+00:00",
+        "2021-11-18T20:34:17+00:00/2021-11-19T20:34:16+00:00",
+        "2021-11-19T20:34:17+00:00/2021-11-20T20:34:16+00:00",
+    ]
+
+
+def test_sequence_needs_recurrence_or_every():
+    with pytest.raises(ValueError) as ex:
+        AnimationSequence(
+            start="-7d",
+            stop="now",
+        )
+    assert ex.match("Parameter `every` is mandatory when `recurrence` is not given")
+
+
+@freeze_time("2021-11-19T20:34:17Z")
+def test_sequence_start_greater_than_stop():
+    with pytest.raises(ValueError) as ex:
+        AnimationSequence(
+            start="+1d",
+            stop="-1d",
+            every="10m",
+        )
+    assert ex.match(
+        re.escape(
+            "Timestamp start=2021-11-20T20:34:17+00:00 is after stop=2021-11-18T20:34:17+00:00"
+        )
+    )
+
+
 def test_scenario_basic():
     scenario = AnimationScenario(
         grafana_url="https://daq.example.org/grafana/",
diff --git a/tests/test_timeutil.py b/tests/test_timeutil.py
index c700d15..5db8459 100644
--- a/tests/test_timeutil.py
+++ b/tests/test_timeutil.py
@@ -1,7 +1,10 @@
+import re
+
+import pytest
 from dateutil.relativedelta import relativedelta
 from dateutil.rrule import DAILY, HOURLY, MINUTELY, MONTHLY, SECONDLY, WEEKLY, YEARLY
 
-from grafanimate.timeutil import get_freq_delta
+from grafanimate.timeutil import convert_absolute_timestamp, get_freq_delta
 
 
 def test_freq_delta_legacy():
@@ -131,3 +134,13 @@ def test_freq_delta_pytimeparse():
     assert recurrence.frequency == YEARLY
     assert recurrence.interval == 3
     assert recurrence.duration == relativedelta(years=+3, months=+5, seconds=-1)
+
+
+def test_convert_absolute_timestamp_wrong_type():
+    with pytest.raises(TypeError) as ex:
+        convert_absolute_timestamp(42.42)
+    assert ex.match(
+        re.escape(
+            "Unknown data type for `start` or `stop` value: 42.42 (<class 'float'>)"
+        )
+    )