diff --git a/cyclonedx/model/dependency.py b/cyclonedx/model/dependency.py
index 98a5525c..4cdfe17e 100644
--- a/cyclonedx/model/dependency.py
+++ b/cyclonedx/model/dependency.py
@@ -113,4 +113,4 @@ class Dependable(ABC):
     @property
     @abstractmethod
     def bom_ref(self) -> BomRef:
-        ...
+        ...  # pragma: no cover
diff --git a/cyclonedx/output/__init__.py b/cyclonedx/output/__init__.py
index bbc4e532..61868d43 100644
--- a/cyclonedx/output/__init__.py
+++ b/cyclonedx/output/__init__.py
@@ -46,12 +46,12 @@ def __init__(self, bom: 'Bom', **kwargs: int) -> None:
     @property
     @abstractmethod
     def schema_version(self) -> SchemaVersion:
-        ...
+        ...  # pragma: no cover
 
     @property
     @abstractmethod
     def output_format(self) -> OutputFormat:
-        ...
+        ...  # pragma: no cover
 
     @property
     def generated(self) -> bool:
@@ -69,13 +69,13 @@ def set_bom(self, bom: 'Bom') -> None:
 
     @abstractmethod
     def generate(self, force_regeneration: bool = False) -> None:
-        ...
+        ...  # pragma: no cover
 
     @abstractmethod
     def output_as_string(self, *,
                          indent: Optional[Union[int, str]] = None,
                          **kwargs: Any) -> str:
-        ...
+        ...  # pragma: no cover
 
     def output_to_file(self, filename: str, allow_overwrite: bool = False, *,
                        indent: Optional[Union[int, str]] = None,
@@ -94,19 +94,19 @@ def output_to_file(self, filename: str, allow_overwrite: bool = False, *,
 @overload
 def make_outputter(bom: 'Bom', output_format: Literal[OutputFormat.JSON],
                    schema_version: SchemaVersion) -> 'JsonOutputter':
-    ...
+    ...  # pragma: no cover
 
 
 @overload
 def make_outputter(bom: 'Bom', output_format: Literal[OutputFormat.XML],
                    schema_version: SchemaVersion) -> 'XmlOutputter':
-    ...
+    ...  # pragma: no cover
 
 
 @overload
 def make_outputter(bom: 'Bom', output_format: OutputFormat,
                    schema_version: SchemaVersion) -> Union['XmlOutputter', 'JsonOutputter']:
-    ...
+    ...  # pragma: no cover
 
 
 def make_outputter(bom: 'Bom', output_format: OutputFormat, schema_version: SchemaVersion) -> BaseOutput:
diff --git a/cyclonedx/output/json.py b/cyclonedx/output/json.py
index 403197b3..bece526b 100644
--- a/cyclonedx/output/json.py
+++ b/cyclonedx/output/json.py
@@ -86,7 +86,7 @@ def output_as_string(self, *,
 
     @abstractmethod
     def _get_schema_uri(self) -> Optional[str]:
-        pass
+        ...  # pragma: no cover
 
 
 class JsonV1Dot0(Json, SchemaVersion1Dot0):
diff --git a/cyclonedx/schema/schema.py b/cyclonedx/schema/schema.py
index 1dc7db27..408e8a6a 100644
--- a/cyclonedx/schema/schema.py
+++ b/cyclonedx/schema/schema.py
@@ -28,7 +28,7 @@ class BaseSchemaVersion(ABC, ViewType):
     @property
     @abstractmethod
     def schema_version_enum(self) -> SchemaVersion:
-        ...
+        ...  # pragma: no cover
 
     def get_schema_version(self) -> str:
         return self.schema_version_enum.to_version()
diff --git a/cyclonedx/validation/__init__.py b/cyclonedx/validation/__init__.py
index f7028d8c..b1e973c1 100644
--- a/cyclonedx/validation/__init__.py
+++ b/cyclonedx/validation/__init__.py
@@ -56,7 +56,7 @@ def validate_str(self, data: str) -> Optional[ValidationError]:
         :retval None: if ``data`` is valid
         :retval ValidationError:  if ``data`` is invalid
         """
-        ...
+        ...  # pragma: no cover
 
 
 class BaseSchemabasedValidator(ABC, SchemabasedValidator):
@@ -76,31 +76,31 @@ def schema_version(self) -> 'SchemaVersion':
     @abstractmethod
     def output_format(self) -> OutputFormat:
         """Get the format."""
-        ...
+        ...  # pragma: no cover
 
     @property
     @abstractmethod
     def _schema_file(self) -> Optional[str]:
         """Get the schema file according to schema version."""
-        ...
+        ...  # pragma: no cover
 
 
 @overload
 def make_schemabased_validator(output_format: Literal[OutputFormat.JSON], schema_version: 'SchemaVersion'
                                ) -> 'JsonValidator':
-    ...
+    ...  # pragma: no cover
 
 
 @overload
 def make_schemabased_validator(output_format: Literal[OutputFormat.XML], schema_version: 'SchemaVersion'
                                ) -> 'XmlValidator':
-    ...
+    ...  # pragma: no cover
 
 
 @overload
 def make_schemabased_validator(output_format: OutputFormat, schema_version: 'SchemaVersion'
                                ) -> Union['JsonValidator', 'XmlValidator']:
-    ...
+    ...  # pragma: no cover
 
 
 def make_schemabased_validator(output_format: OutputFormat, schema_version: 'SchemaVersion'