diff --git a/dangerzone/updater/signatures.py b/dangerzone/updater/signatures.py
index a407c2b..2b3c676 100644
--- a/dangerzone/updater/signatures.py
+++ b/dangerzone/updater/signatures.py
@@ -401,8 +401,7 @@ def get_remote_signatures(image: str, digest: str) -> List[Dict]:
 
     # Remove the last return, split on newlines, convert from JSON
     signatures_raw = process.stdout.decode("utf-8").strip().split("\n")
-    signatures = list(map(json.loads, signatures_raw))
-    breakpoint()
+    signatures = list(filter(bool, map(json.loads, signatures_raw)))
     if len(signatures) < 1:
         raise errors.NoRemoteSignatures("No signatures found for the image")
     return signatures
diff --git a/tests/conftest.py b/tests/conftest.py
index 3bef1af..4ac4aa0 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -13,6 +13,13 @@ from dangerzone.gui import Application
 sys.dangerzone_dev = True  # type: ignore[attr-defined]
 
 
+ASSETS_PATH = Path(__file__).parent / "assets"
+TEST_PUBKEY_PATH = ASSETS_PATH / "test.pub.key"
+INVALID_SIGNATURES_PATH = ASSETS_PATH / "signatures" / "invalid"
+VALID_SIGNATURES_PATH = ASSETS_PATH / "signatures" / "valid"
+TEMPERED_SIGNATURES_PATH = ASSETS_PATH / "signatures" / "tempered"
+
+
 # Use this fixture to make `pytest-qt` invoke our custom QApplication.
 # See https://pytest-qt.readthedocs.io/en/latest/qapplication.html#testing-custom-qapplications
 @pytest.fixture(scope="session")
@@ -133,6 +140,11 @@ for_each_doc = pytest.mark.parametrize(
 )
 
 
+@pytest.fixture
+def signature():
+    return {}
+
+
 # External Docs - base64 docs encoded for externally sourced documents
 # XXX to reduce the chance of accidentally opening them
 test_docs_external_dir = Path(__file__).parent.joinpath(SAMPLE_EXTERNAL_DIRECTORY)
diff --git a/tests/test_signatures.py b/tests/test_signatures.py
index 8eafa9c..d62c670 100644
--- a/tests/test_signatures.py
+++ b/tests/test_signatures.py
@@ -28,6 +28,21 @@ VALID_SIGNATURES_PATH = ASSETS_PATH / "signatures" / "valid"
 TEMPERED_SIGNATURES_PATH = ASSETS_PATH / "signatures" / "tempered"
 
 
+@pytest.fixture
+def valid_signature():
+    signature_file = next(VALID_SIGNATURES_PATH.glob("**/*.json"))
+    with open(signature_file, "r") as signature_file:
+        signatures = json.load(signature_file)
+        return signatures.pop()
+
+
+@pytest.fixture
+def signature_other_digest(valid_signature):
+    signature = valid_signature.copy()
+    signature["Bundle"]["Payload"]["digest"] = "sha256:123456"
+    return signature
+
+
 def test_load_valid_signatures(mocker):
     mocker.patch("dangerzone.updater.signatures.SIGNATURES_PATH", VALID_SIGNATURES_PATH)
     valid_signatures = list(VALID_SIGNATURES_PATH.glob("**/*.json"))
@@ -163,29 +178,30 @@ def test_get_remote_signatures_empty(fp: FakeProcess, mocker):
     mocker.patch("dangerzone.updater.cosign.ensure_installed", return_value=True)
     fp.register_subprocess(
         ["cosign", "download", "signature", f"{image}@sha256:{digest}"],
-        stdout=json.dumps([]),
+        stdout=json.dumps({}),
     )
     with pytest.raises(errors.NoRemoteSignatures):
         get_remote_signatures(image, digest)
 
 
-def test_get_remote_signatures_cosign_error():
-    pass
+def test_get_remote_signatures_cosign_error(mocker, fp: FakeProcess):
+    image = "ghcr.io/freedomofpress/dangerzone/dangerzone"
+    digest = "123456"
+    mocker.patch("dangerzone.updater.cosign.ensure_installed", return_value=True)
+    fp.register_subprocess(
+        ["cosign", "download", "signature", f"{image}@sha256:{digest}"],
+        returncode=1,
+        stderr="Error: no signatures associated",
+    )
+    with pytest.raises(errors.NoRemoteSignatures):
+        get_remote_signatures(image, digest)
 
 
-def test_verify_local_image_no_signatures():
-    pass
-
-
-def test_verify_local_image_invalid_signatures():
-    pass
-
-
-def test_verify_local_image():
-    pass
-
-
-def test_store_signatures_with_different_digests():
+def test_store_signatures_with_different_digests(
+    valid_signature, signature_other_digest
+):
+    signatures = [valid_signature, signature_other_digest]
+    breakpoint()
     pass
 
 
@@ -217,5 +233,6 @@ def test_verify_signature_wrong_payload_digest():
     pass
 
 
-def test_verify_signatures_not_0():
-    pass
+def test_verify_signatures_empty_list():
+    with pytest.raises(errors.SignatureVerificationError):
+        verify_signatures([], "1234", TEST_PUBKEY_PATH)