3 files changed, 49 insertions, 1 deletions

diff --git a/test/test.cc b/test/test.cc
index 318ac4799..c5bc417f3 100644
--- a/test/test.cc
+++ b/test/test.cc
@@ -495,3 +495,26 @@ subtitle_file (shared_ptr<Film> film)
 	/* Remove warning */
 	return boost::filesystem::path("/");
 }
+
+void
+make_random_file (boost::filesystem::path path, size_t size)
+{
+	size_t const chunk = 128 * 1024;
+	uint8_t* buffer = static_cast<uint8_t*> (malloc(chunk));
+	BOOST_REQUIRE (buffer);
+	FILE* r = fopen("/dev/urandom", "rb");
+	BOOST_REQUIRE (r);
+	FILE* t = fopen_boost(path, "wb");
+	BOOST_REQUIRE (t);
+	while (size) {
+		size_t this_time = min (size, chunk);
+		size_t N = fread (buffer, 1, this_time, r);
+		BOOST_REQUIRE (N == this_time);
+		N = fwrite (buffer, 1, this_time, t);
+		BOOST_REQUIRE (N == this_time);
+		size -= this_time;
+	}
+	fclose (t);
+	fclose (r);
+	free (buffer);
+}
diff --git a/test/test.h b/test/test.h
index 4020dc772..86b13cde5 100644
--- a/test/test.h
+++ b/test/test.h
@@ -42,3 +42,4 @@ extern void write_image (boost::shared_ptr<const Image> image, boost::filesystem
 boost::filesystem::path dcp_file (boost::shared_ptr<const Film> film, std::string prefix);
 void check_one_frame (boost::filesystem::path dcp, int64_t index, boost::filesystem::path ref);
 extern boost::filesystem::path subtitle_file (boost::shared_ptr<Film> film);
+extern void make_random_file (boost::filesystem::path path, size_t size);
diff --git a/test/util_test.cc b/test/util_test.cc
index 709bb0827..1c1091f28 100644
--- a/test/util_test.cc
+++ b/test/util_test.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2012-2016 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2012-2019 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -26,11 +26,14 @@
 #include "lib/util.h"
 #include "lib/cross.h"
 #include "lib/exceptions.h"
+#include "test.h"
 #include <dcp/certificate_chain.h>
 #include <boost/test/unit_test.hpp>
+#include <boost/bind.hpp>
 
 using std::string;
 using std::vector;
+using std::list;
 using boost::shared_ptr;
 using namespace dcpomatic;
 
@@ -129,3 +132,24 @@ BOOST_AUTO_TEST_CASE (careful_string_filter_test)
 	BOOST_CHECK_EQUAL ("hello_world", careful_string_filter("héllo_wörld"));
 	BOOST_CHECK_EQUAL ("hello_world_a", careful_string_filter("héllo_wörld_à"));
 }
+
+static list<float> progress_values;
+
+static void
+progress (float p)
+{
+	progress_values.push_back (p);
+}
+
+BOOST_AUTO_TEST_CASE (copy_in_bits_test)
+{
+	for (int i = 0; i < 32; ++i) {
+		make_random_file ("build/test/random.dat", rand() % (256 * 1024 * 1024));
+
+		progress_values.clear ();
+		copy_in_bits ("build/test/random.dat", "build/test/random.dat2", boost::bind(&progress, _1));
+		BOOST_CHECK (!progress_values.empty());
+
+		check_file ("build/test/random.dat", "build/test/random.dat2");
+	}
+}