diff --git a/codecov.yml b/codecov.yml
index 75e0b701..b6065253 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -1,4 +1,4 @@
 ignore:
   - "docs"
   - "tests"
-  - "examples"
+  - "examples"
\ No newline at end of file
diff --git a/pyjelly/options.py b/pyjelly/options.py
index 64ee8b00..e1a1cdd9 100644
--- a/pyjelly/options.py
+++ b/pyjelly/options.py
@@ -76,6 +76,12 @@ def flat(self) -> bool:
         )
 
     def __repr__(self) -> str:
+        """
+        Return the representation of StreamTypes.
+
+        >>> repr(StreamTypes(9999, 8888))
+        'StreamTypes(9999, 8888)'
+        """
         with suppress(ValueError):
             physical_type_name = jelly.PhysicalStreamType.Name(self.physical_type)
             logical_type_name = jelly.LogicalStreamType.Name(self.logical_type)
diff --git a/tests/unit_tests/test_options.py b/tests/unit_tests/test_options.py
index 762946fc..64688e2d 100644
--- a/tests/unit_tests/test_options.py
+++ b/tests/unit_tests/test_options.py
@@ -3,10 +3,18 @@
 from unittest.mock import Mock
 
 import pytest
+from _pytest.monkeypatch import MonkeyPatch
 
+import pyjelly.options as op
 from pyjelly import jelly
-from pyjelly.errors import JellyAssertionError
-from pyjelly.options import StreamParameters, StreamTypes
+from pyjelly.errors import JellyAssertionError, JellyConformanceError
+from pyjelly.options import (
+    MIN_NAME_LOOKUP_SIZE,
+    MIN_VERSION,
+    LookupPreset,
+    StreamParameters,
+    StreamTypes,
+)
 from pyjelly.parse.decode import options_from_frame
 
 
@@ -151,3 +159,28 @@ def test_stream_parameters(generalized_statements: int, rdf_star: int) -> None:
     )
     assert params.generalized_statements == mock_options.generalized_statements
     assert params.rdf_star == mock_options.rdf_star
+
+
+def test_lookup_preset_validation() -> None:
+    with pytest.raises(JellyConformanceError):
+        LookupPreset(max_names=MIN_NAME_LOOKUP_SIZE - 1)
+    p = LookupPreset.small()
+    assert (p.max_names, p.max_prefixes, p.max_datatypes) == (128, 32, 32)
+
+
+def test_stream_parameters_version() -> None:
+    s1 = StreamParameters(namespace_declarations=False)
+    assert s1.version == MIN_VERSION
+    s2 = StreamParameters(namespace_declarations=True)
+    assert s2.version == 2
+
+
+def test_stream_options_invalid_version(monkeypatch: MonkeyPatch) -> None:
+    monkeypatch.setattr(op, "MIN_VERSION", 10)
+    monkeypatch.setattr(op, "MAX_VERSION", 5)
+
+    with pytest.raises(JellyConformanceError) as excinfo:
+        StreamParameters(namespace_declarations=True)
+
+    msg = str(excinfo.value)
+    assert "Version must be between 10 and 5" in msg