3 files changed, 68 insertions, 0 deletions
diff --git a/test/meson.build b/test/meson.build
index 2ed73e63..97e082e0 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -16,6 +16,7 @@ simple_script_paths = [
   '../scripts/check_formatting.py',
   'serd_test_util/__init__.py',
   'run_suite.py',
+  'test_empty.py',
   'test_quiet.py',
   'test_stdin.py',
   'test_write_error.py',
@@ -256,6 +257,15 @@ if is_variable('serdi')
     suite: input_suite,
   )
 
+  # Output
+
+  test(
+    'empty',
+    files('test_empty.py'),
+    args: script_args + [serd_ttl],
+    env: test_env,
+    suite: 'output',
+  )
 
   # IO errors
 
diff --git a/test/test_empty.py b/test/test_empty.py
new file mode 100755
index 00000000..3cd5517b
--- /dev/null
+++ b/test/test_empty.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+
+# Copyright 2022-2023 David Robillard <d@drobilla.net>
+# SPDX-License-Identifier: ISC
+
+"""Test writing empty output."""
+
+# pylint: disable=duplicate-code
+
+import shlex
+import subprocess
+import tempfile
+
+import serd_test_util as util
+
+args = util.wrapper_args(__doc__, True)
+command = shlex.split(args.wrapper) + [args.serdi, "-o", "empty", args.input]
+
+with tempfile.TemporaryFile() as out:
+    proc = subprocess.run(command, check=False, stdout=out)
+
+    out.seek(0, 2)  # Seek to end
+
+    assert proc.returncode == 0
+    assert out.tell() == 0
diff --git a/test/test_writer.c b/test/test_writer.c
index 1334bb02..6066b6e3 100644
--- a/test/test_writer.c
+++ b/test/test_writer.c
@@ -293,6 +293,38 @@ test_writer_stack_overflow(void)
   serd_world_free(world);
 }
 
+static void
+test_write_empty_syntax(void)
+{
+  SerdWorld* world = serd_world_new();
+  SerdEnv*   env   = serd_env_new(serd_empty_string());
+
+  SerdNode* s = serd_new_uri(serd_string("http://example.org/s"));
+  SerdNode* p = serd_new_uri(serd_string("http://example.org/p"));
+  SerdNode* o = serd_new_curie(serd_string("eg:o"));
+
+  SerdBuffer buffer = {NULL, 0};
+
+  SerdWriter* writer = serd_writer_new(
+    world, SERD_SYNTAX_EMPTY, 0U, env, serd_buffer_sink, &buffer);
+
+  assert(writer);
+
+  assert(!serd_sink_write(serd_writer_sink(writer), 0U, s, p, o, NULL));
+
+  char* out = serd_buffer_sink_finish(&buffer);
+
+  assert(strlen(out) == 0);
+  serd_free(out);
+
+  serd_writer_free(writer);
+  serd_node_free(o);
+  serd_node_free(p);
+  serd_node_free(s);
+  serd_env_free(env);
+  serd_world_free(world);
+}
+
 int
 main(void)
 {
@@ -303,6 +335,7 @@ main(void)
   test_strict_write();
   test_write_error();
   test_writer_stack_overflow();
+  test_write_empty_syntax();
 
   return 0;
 }