diff --git a/tests/data_normalizer/test_java.py b/tests/data_normalizer/test_java.py
index 488a29734..2a67cc2da 100644
--- a/tests/data_normalizer/test_java.py
+++ b/tests/data_normalizer/test_java.py
@@ -38,3 +38,17 @@ def test_transforming_java_data(data, expected):
         transformed_value = sorted(transformed_data[key]) \
             if isinstance(transformed_data[key], list) else transformed_data[key]
         assert transformed_value == value, transformed_data
+
+
+def test_constructor_error_input():
+    """Test MavenDataNormalizer constructor for error input."""
+    dn = MavenDataNormalizer({})
+    assert dn is not None
+
+
+def test_normalize_error_input():
+    """Test MavenDataNormalizer constructor for error input."""
+    dn = MavenDataNormalizer({})
+    assert dn is not None
+    n = dn.normalize()
+    assert n == {}