diff --git a/sources/test/test_inline.py b/sources/test/test_inline.py
new file mode 100644
index 00000000..18c1a293
--- /dev/null
+++ b/sources/test/test_inline.py
@@ -0,0 +1,33 @@
+import binascii
+import hashlib
+import lzma
+
+import pytest
+
+SOURCES_NAME = "org.osbuild.inline"
+
+
+@pytest.mark.parametrize("encoding", ["base64", "lzma+base64"])
+def test_inline_fetch(tmp_path, sources_service, encoding):
+    test_data = b"1234"
+    hasher = hashlib.new("sha256")
+    hasher.update(test_data)
+    if encoding == "base64":
+        encoded_data = binascii.b2a_base64(test_data)
+    elif encoding == "lzma+base64":
+        encoded_data = binascii.b2a_base64(lzma.compress(test_data))
+    else:
+        raise ValueError(f"unsupported encoding {encoding}")
+
+    test_data_chksum = f"sha256:{hasher.hexdigest()}"
+    TEST_SOURCES = {
+        test_data_chksum: {
+            "encoding": encoding,
+            "data": encoded_data,
+        },
+    }
+    sources_service.cache = tmp_path / "cachedir"
+    sources_service.cache.mkdir()
+    sources_service.tmpdir = tmp_path
+    sources_service.fetch_all(TEST_SOURCES)
+    assert (sources_service.cache / test_data_chksum).read_bytes() == test_data