diff --git a/tests/conftest.py b/tests/conftest.py
index ab1b852..f8eb867 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -80,6 +80,13 @@ def upload_id_photo(onfido_api, applicant_id):
     )
 
 
+def upload_signing_document(onfido_api, applicant_id, file_path="tests/media/sample_signing_document.pdf"):
+    return onfido_api.upload_signing_document(
+        applicant_id=applicant_id,
+        file=file_path,
+    )
+
+
 def create_check(
     onfido_api,
     check_builder=None,
diff --git a/tests/media/sample_signing_document.pdf b/tests/media/sample_signing_document.pdf
new file mode 100644
index 0000000..aceafc9
Binary files /dev/null and b/tests/media/sample_signing_document.pdf differ
diff --git a/tests/test_signing_documents.py b/tests/test_signing_documents.py
new file mode 100644
index 0000000..43baf5d
--- /dev/null
+++ b/tests/test_signing_documents.py
@@ -0,0 +1,65 @@
+import pytest
+from pydantic import ValidationError
+
+from onfido import ApiException, SigningDocument, SigningDocumentsList
+from tests.conftest import create_applicant, upload_signing_document
+
+INEXISTENT_SIGNING_DOCUMENT_ID = "00000000-0000-0000-0000-000000000000"
+
+
+@pytest.fixture(scope="function")
+def applicant(onfido_api):
+    return create_applicant(onfido_api)
+
+
+@pytest.fixture(scope="function")
+def signing_document(onfido_api, applicant):
+    return upload_signing_document(onfido_api, applicant.id)
+
+
+def test_upload_signing_document(signing_document, applicant):
+    assert isinstance(signing_document, SigningDocument)
+    assert signing_document.file_name == "sample_signing_document.pdf"
+    assert signing_document.file_type == "pdf"
+    assert signing_document.applicant_id == applicant.id
+    assert signing_document.href is not None
+    assert signing_document.download_href is not None
+    assert signing_document.file_size is not None and signing_document.file_size > 0
+    assert signing_document.model_dump_json(by_alias=True, exclude_none=True) is not None
+
+
+def test_download_signing_document(onfido_api, signing_document):
+    file_contents = onfido_api.download_signing_document(signing_document.id)
+
+    assert len(file_contents) > 0
+    assert bytes(file_contents[:4]) == b"%PDF"
+
+
+def test_find_signing_document(onfido_api, signing_document, applicant):
+    found = onfido_api.find_signing_document(signing_document.id)
+
+    assert isinstance(found, SigningDocument)
+    assert found.id == signing_document.id
+    assert found.file_name == "sample_signing_document.pdf"
+    assert found.file_type == "pdf"
+    assert found.applicant_id == applicant.id
+    assert found.download_href is not None
+    assert found.model_dump_json(by_alias=True, exclude_none=True) is not None
+
+
+def test_list_signing_documents(onfido_api, applicant, signing_document):
+    documents = onfido_api.list_signing_documents(applicant.id)
+
+    assert documents is not None
+    assert isinstance(documents, SigningDocumentsList)
+    assert any(doc.id == signing_document.id for doc in documents.signing_documents)
+
+
+def test_upload_signing_document_with_null_params(onfido_api):
+    with pytest.raises(ValidationError):
+        onfido_api.upload_signing_document(None, None)
+
+
+def test_download_inexistent_signing_document(onfido_api):
+    with pytest.raises(ApiException):
+        onfido_api.download_signing_document(INEXISTENT_SIGNING_DOCUMENT_ID)