Adding unit tests for image magic durations

tests/ImageReader.cpp

@@ -0,0 +1,36 @@
+/**
+ * @file
+ * @brief Unit tests for openshot::ImageReader
+ * @author Jonathan Thomas <jonathan@openshot.org>
+ *
+ * @ref License
+ */
+
+// Copyright (c) 2008-2025 OpenShot Studios, LLC
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#include "openshot_catch.h"
+
+#include "ImageReader.h"
+#include "Exceptions.h"
+#include "Frame.h"
+
+using namespace openshot;
+
+TEST_CASE( "Duration_And_Length_ImageReader", "[libopenshot][imagereader]" )
+{
+	// Create a reader
+	std::stringstream path;
+	path << TEST_MEDIA_PATH << "front.png";
+	ImageReader r(path.str());
+	r.Open();
+
+	// Duration and frame count should be aligned to fps (1 hour at 30 fps)
+	CHECK(r.info.fps.num == 30);
+	CHECK(r.info.fps.den == 1);
+	CHECK(r.info.video_length == 108000);
+	CHECK(r.info.duration == Approx(3600.0f).margin(0.001f));
+
+	r.Close();
+}