diff --git a/tests/unit/utils/test_bits_to_byte.py b/tests/unit/utils/test_bits_to_byte.py
new file mode 100644
index 0000000..fbbc69c
--- /dev/null
+++ b/tests/unit/utils/test_bits_to_byte.py
@@ -0,0 +1,35 @@
+from src.jeb_utils.utils import bits_to_byte
+import pytest
+
+@pytest.mark.parametrize('bits,expected', [
+    ((), b'\x00'),
+    ((0,), b'\x00'),
+    ((0, 0), b'\x00'),
+    ((0, 0, 0, 0, 0, 0, 0, 0), b'\x00'),
+    ((1,), b'\x01'),
+    ((0, 1), b'\x01'),
+    ((0, 0, 0, 0, 0, 0, 0, 1), b'\x01'),
+    ((0, 0, 0, 0, 1, 0, 0, 1), b'\x09'),
+    ((1, 0, 0, 1), b'\x09'),
+    ((1, 1, 1, 1, 1, 1, 1), b'\x7f'),
+    ((0, 1, 1, 1, 1, 1, 1, 1), b'\x7f'),
+    ((1, 1, 1, 1, 1, 1, 1, 1), b'\xff'),
+])
+def test_bits_to_byte(bits, expected):
+    assert bits_to_byte(*bits) == expected
+
+@pytest.mark.parametrize('bits,expected_exception', [
+    ((2,), ValueError),
+    ((0, 0, 0, 0, 0, 0, 0, 0, 0), ValueError),
+    ((0, 0, 0, 0, 0, 0, 0, 0, 1), ValueError),
+    ((1, 0, 0, 0, 0, 0, 0, 0, 0), ValueError),
+    ((1, 1, 1, 1, 1, 1, 1, 1, 1), ValueError),
+    ((1, 1, 1, 1, 1, 1, 1, 2), ValueError),
+    ((1, 1, 1, 1, 1, 1, 1, -1), ValueError),
+    ((3, 3, 3, 3, 3, 3, 3, 3), ValueError),
+    ((3, 3, 3, 3, 3, 3), ValueError),
+    ((3, 3, 3, 3, 3, 3, 1, 0), ValueError),
+])
+def test_bits_to_byte_exceptions(bits, expected_exception):
+    with pytest.raises(expected_exception):
+        bits_to_byte(*bits)
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