2 files changed, 71 insertions, 2 deletions
diff --git a/tests/libio/Makemodule.am b/tests/libio/Makemodule.am
index 3676d1a..2803b43 100644
--- a/tests/libio/Makemodule.am
+++ b/tests/libio/Makemodule.am
@@ -3,9 +3,12 @@ test_get_line_LDADD = libio.a libcompat.a
 test_get_line_CPPFLAGS = $(AM_CPPFLAGS)
 test_get_line_CPPFLAGS += -DTESTFILE=$(top_srcdir)/tests/libio/get_line.txt
 
+test_sparse_fb_SOURCES = tests/libio/sparse_fb.c
+test_sparse_fb_LDADD = libio.a libutil.a libcompat.a
+
 if BUILD_TOOLS
-check_PROGRAMS += test_get_line
-TESTS += test_get_line
+check_PROGRAMS += test_get_line test_sparse_fb
+TESTS += test_get_line test_sparse_fb
 endif
 
 EXTRA_DIST += $(top_srcdir)/tests/libio/get_line.txt
diff --git a/tests/libio/sparse_fb.c b/tests/libio/sparse_fb.c
new file mode 100644
index 0000000..fa4b840
--- /dev/null
+++ b/tests/libio/sparse_fb.c
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * get_line.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "io/ostream.h"
+#include "util/test.h"
+#include "util/util.h"
+
+static ostream_t dummy;
+static size_t total = 0;
+
+static int dummy_append(ostream_t *strm, const void *data, size_t size)
+{
+	bool bret;
+
+	TEST_ASSERT(strm == &dummy);
+	TEST_NOT_NULL(data);
+	TEST_ASSERT(size > 0);
+
+	bret = is_memory_zero(data, size);
+	TEST_ASSERT(bret);
+
+	bret = SZ_ADD_OV(total, size, &total);
+	TEST_ASSERT(!bret);
+	return 0;
+}
+
+static int dummy_flush(ostream_t *strm)
+{
+	TEST_ASSERT(strm == &dummy);
+	return 0;
+}
+
+static ostream_t dummy = {
+	{
+		1,
+		NULL,
+		NULL,
+	},
+	dummy_append,
+	NULL,
+	dummy_flush,
+	NULL,
+};
+
+int main(int argc, char **argv)
+{
+	size_t ref;
+	int ret;
+	(void)argc; (void)argv;
+
+	ref = 131072 + 1337;
+
+	ret = ostream_append_sparse(&dummy, ref);
+	TEST_EQUAL_I(ret, 0);
+
+	ret = ostream_flush(&dummy);
+	TEST_EQUAL_I(ret, 0);
+
+	TEST_EQUAL_UI(ref, total);
+	return EXIT_SUCCESS;
+}