diff --git a/codecov.yml b/codecov.yml
index cf1d832..d4ed5a1 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -9,6 +9,14 @@ coverage:
         threshold: 5%  # Allow 5% drop without failing
         if_no_uploads: error  # Fail if no coverage data
         only_pulls: false  # Check coverage on all commits
+      # Custom group for tests module with higher threshold
+      tests:
+        target: 99%  # Very high threshold for test files
+        threshold: 1%  # Allow only 1% drop
+        paths:
+          - "tests/**"  # Coverage for all test files
+        if_no_uploads: error
+        only_pulls: false
     patch:
       default:
         target: 85%  # Lower threshold for new code
diff --git a/tests/benchmark/test_slow_benchmarks.py b/tests/benchmark/test_slow_benchmarks.py
index ab2059f..4cf2ad1 100644
--- a/tests/benchmark/test_slow_benchmarks.py
+++ b/tests/benchmark/test_slow_benchmarks.py
@@ -46,6 +46,12 @@ def _make_packet_list(generator):
 
         # Make sure the result actually makes sense
         assert len(packet_list) == 7200
+
+        # Also verify the helper functions work correctly for coverage
+        packet_fh.seek(0)
+        test_gen = generators.ccsds_generator(packet_fh)
+        test_list = _make_packet_list(test_gen)
+        assert len(test_list) == 7200
     finally:
         # Ensure filehandler is closed
         packet_fh.close()
@@ -79,6 +85,12 @@ def _make_packet_list(generator):
 
         # Make sure the result actually makes sense
         assert len(packet_list) == 78
+
+        # Also verify the helper functions work correctly for coverage
+        packet_fh.seek(0)
+        test_gen = generators.ccsds_generator(packet_fh, show_progress=True)
+        test_list = _make_packet_list(test_gen)
+        assert len(test_list) == 78
     finally:
         # Ensure filehandler is closed
         packet_fh.close()
diff --git a/tests/conftest.py b/tests/conftest.py
index 37f6384..4efc465 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -47,12 +47,6 @@ def jpss_test_data_dir(test_data_dir):
     return test_data_dir / "jpss"
 
 
-@pytest.fixture
-def clarreo_test_data_dir(test_data_dir):
-    """CLARREO test data directory"""
-    return test_data_dir / "clarreo"
-
-
 @pytest.fixture
 def suda_test_data_dir(test_data_dir):
     """SUDA test data directory"""
diff --git a/tests/unit/test_common.py b/tests/unit/test_common.py
index 07b1fc3..199a6fd 100644
--- a/tests/unit/test_common.py
+++ b/tests/unit/test_common.py
@@ -32,6 +32,8 @@ def ignored(self, x):
     a.public += 1  # Change an attribute that _does_ get compared
     with pytest.raises(AssertionError):
         assert a == b
+    # Test that the ignored method works (even though it's ignored in comparison)
+    assert a.ignored(5) == 10
 
 
 @pytest.mark.parametrize(
diff --git a/tests/unit/test_xtce/test_calibrators.py b/tests/unit/test_xtce/test_calibrators.py
index 8564821..04ac9a2 100644
--- a/tests/unit/test_xtce/test_calibrators.py
+++ b/tests/unit/test_xtce/test_calibrators.py
@@ -327,6 +327,15 @@ def test_context_calibrator_calibrate(context_calibrator, parsed_data, parsed_va
                 ],
             ),
         ),
+        # Error case: invalid spline point value
+        (
+            f"""
+<xtce:SplineCalibrator xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:SplinePoint raw="invalid" calibrated="10"/>
+</xtce:SplineCalibrator>
+""",
+            ValueError("could not convert string to float"),
+        ),
     ],
 )
 def test_spline_calibrator(elmaker, xtce_parser, xml_string: str, expectation):
@@ -406,6 +415,15 @@ def test_spline_calibrator_calibrate(xq, order, extrapolate, expectation):
                 ]
             ),
         ),
+        # Error case: invalid coefficient value
+        (
+            f"""
+<xtce:PolynomialCalibrator xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:Term exponent="0" coefficient="invalid"/>
+</xtce:PolynomialCalibrator>
+""",
+            ValueError("could not convert string to float"),
+        ),
     ],
 )
 def test_polynomial_calibrator(elmaker, xtce_parser, xml_string: str, expectation):
diff --git a/tests/unit/test_xtce/test_comparisons.py b/tests/unit/test_xtce/test_comparisons.py
index fcb696a..153452c 100644
--- a/tests/unit/test_xtce/test_comparisons.py
+++ b/tests/unit/test_xtce/test_comparisons.py
@@ -394,6 +394,16 @@ def test_condition_validity_check(args, kwargs, expected_error, expected_error_m
             ),
             True,
         ),
+        # Error case: invalid XML structure (missing ComparisonOperator)
+        (
+            f"""
+<xtce:BooleanExpression xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:Condition parameterRef="P" value="invalid" />
+</xtce:BooleanExpression>
+""",
+            SpacePacket(**{"P": common.IntParameter(100, 4)}),
+            AttributeError("'NoneType' object has no attribute 'text'"),
+        ),
     ],
 )
 def test_boolean_expression(elmaker, xtce_parser, xml_string, test_parsed_data, expected_result):
diff --git a/tests/unit/test_xtce/test_encodings.py b/tests/unit/test_xtce/test_encodings.py
index b4a7c1f..2d8d5ac 100644
--- a/tests/unit/test_xtce/test_encodings.py
+++ b/tests/unit/test_xtce/test_encodings.py
@@ -294,6 +294,13 @@ def test_string_data_encoding_validation(args, kwargs, expected_error, expected_
                 ],
             ),
         ),
+        # Error case: invalid sizeInBits value
+        (
+            f"""
+<xtce:IntegerDataEncoding xmlns:xtce="{XTCE_1_2_XMLNS}" sizeInBits="invalid" encoding="unsigned"/>
+""",
+            ValueError("invalid literal for int()"),
+        ),
     ],
 )
 def test_integer_data_encoding(elmaker, xtce_parser, xml_string: str, expectation):
@@ -520,6 +527,19 @@ def test_float_data_encoding_validation(args, kwargs, expected_error, expected_e
                 ]
             ),
         ),
+        # Error case: invalid fixed size value
+        (
+            f"""
+<xtce:BinaryDataEncoding xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:SizeInBits>
+        <xtce:Fixed>
+            <xtce:FixedValue>invalid</xtce:FixedValue>
+        </xtce:Fixed>
+    </xtce:SizeInBits>
+</xtce:BinaryDataEncoding>
+""",
+            ValueError("invalid literal for int()"),
+        ),
     ],
 )
 def test_binary_data_encoding(elmaker, xtce_parser, xml_string: str, expectation):
diff --git a/tests/unit/test_xtce/test_parameter_types.py b/tests/unit/test_xtce/test_parameter_types.py
index 842197c..8f681cd 100644
--- a/tests/unit/test_xtce/test_parameter_types.py
+++ b/tests/unit/test_xtce/test_parameter_types.py
@@ -62,6 +62,21 @@
                 encoding=encodings.StringDataEncoding(fixed_raw_length=40, termination_character="00"),
             ),
         ),
+        # Error case: missing name attribute
+        (
+            f"""
+<xtce:StringParameterType xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:StringDataEncoding>
+        <xtce:SizeInBits>
+            <xtce:Fixed>
+                <xtce:FixedValue>40</xtce:FixedValue>
+            </xtce:Fixed>
+        </xtce:SizeInBits>
+    </xtce:StringDataEncoding>
+</xtce:StringParameterType>
+""",
+            ValueError("Parameter Type name attribute is required"),
+        ),
     ],
 )
 def test_string_parameter_type(elmaker, xtce_parser, xml_string: str, expectation):
@@ -168,6 +183,15 @@ def test_string_parameter_type(elmaker, xtce_parser, xml_string: str, expectatio
                 ),
             ),
         ),
+        # Error case: missing name attribute
+        (
+            f"""
+<xtce:IntegerParameterType xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:IntegerDataEncoding sizeInBits="16" encoding="unsigned"/>
+</xtce:IntegerParameterType>
+""",
+            ValueError("Parameter Type name attribute is required"),
+        ),
     ],
 )
 def test_integer_parameter_type(elmaker, xtce_parser, xml_string: str, expectation):
@@ -289,6 +313,15 @@ def test_integer_parameter_type(elmaker, xtce_parser, xml_string: str, expectati
                 ),
             ),
         ),
+        # Error case: missing name attribute
+        (
+            f"""
+<xtce:FloatParameterType xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:IntegerDataEncoding sizeInBits="16" encoding="unsigned"/>
+</xtce:FloatParameterType>
+""",
+            ValueError("Parameter Type name attribute is required"),
+        ),
     ],
 )
 def test_float_parameter_type(elmaker, xtce_parser, xml_string: str, expectation):
@@ -420,6 +453,18 @@ def test_float_parameter_type(elmaker, xtce_parser, xml_string: str, expectation
                 },
             ),
         ),
+        # Error case: missing name attribute
+        (
+            f"""
+<xtce:EnumeratedParameterType xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:IntegerDataEncoding sizeInBits="8" encoding="unsigned"/>
+    <xtce:EnumerationList>
+        <xtce:Enumeration label="TEST" value="1"/>
+    </xtce:EnumerationList>
+</xtce:EnumeratedParameterType>
+""",
+            KeyError("name"),
+        ),
     ],
 )
 def test_enumerated_parameter_type(elmaker, xtce_parser, xml_string: str, expectation):
@@ -517,6 +562,21 @@ def test_enumerated_parameter_type(elmaker, xtce_parser, xml_string: str, expect
                 encoding=encodings.BinaryDataEncoding(size_reference_parameter="SizeFromThisParameter"),
             ),
         ),
+        # Error case: missing name attribute
+        (
+            f"""
+<xtce:BinaryParameterType xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:BinaryDataEncoding>
+        <xtce:SizeInBits>
+            <xtce:Fixed>
+                <xtce:FixedValue>8</xtce:FixedValue>
+            </xtce:Fixed>
+        </xtce:SizeInBits>
+    </xtce:BinaryDataEncoding>
+</xtce:BinaryParameterType>
+""",
+            ValueError("Parameter Type name attribute is required"),
+        ),
     ],
 )
 def test_binary_parameter_type(elmaker, xtce_parser, xml_string: str, expectation):
@@ -594,6 +654,15 @@ def test_binary_parameter_type(elmaker, xtce_parser, xml_string: str, expectatio
                 encoding=encodings.StringDataEncoding(fixed_raw_length=40, termination_character="00"),
             ),
         ),
+        # Error case: missing name attribute
+        (
+            f"""
+<xtce:BooleanParameterType xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:IntegerDataEncoding sizeInBits="1" encoding="unsigned"/>
+</xtce:BooleanParameterType>
+""",
+            ValueError("Parameter Type name attribute is required"),
+        ),
     ],
 )
 def test_boolean_parameter_type(elmaker, xtce_parser, xml_string, expectation):
@@ -732,6 +801,17 @@ def test_boolean_parameter_type(elmaker, xtce_parser, xml_string, expectation):
                 ),
             ),
         ),
+        # Error case: missing name attribute
+        (
+            f"""
+<xtce:AbsoluteTimeParameterType xmlns:xtce="{XTCE_1_2_XMLNS}">
+    <xtce:Encoding offset="0" units="s">
+        <xtce:IntegerDataEncoding sizeInBits="32" encoding="unsigned"/>
+    </xtce:Encoding>
+</xtce:AbsoluteTimeParameterType>
+""",
+            KeyError("name"),
+        ),
     ],
 )
 def test_absolute_time_parameter_type(elmaker, xtce_parser, xml_string, expectation):