add more comments to unittest

test/animationinformation_test.cpp

@@ -32,7 +32,9 @@ struct GameTickData : TestData {
  * This happens directly after the game_logic (_fProgressToNextGameTick = 0) or if no GameTick is due between two GameTicks (_fProgressToNextGameTick != 0).
  */
 struct RenderingData : TestData {
-
+	/*
+	* @brief the progress as a fraction (0.0f to 1.0f) in time to the next game tick
+	*/
 	float _fProgressToNextGameTick;
 	int _ExpectedRenderingFrame;
 	RenderingData(float fProgressToNextGameTick, int expectedRenderingFrame)
@@ -42,6 +44,12 @@ struct RenderingData : TestData {
 	}
 };
 
+/*
+* @brief
+* This UnitTest tries to simulate the GameLoop (GameTickData) and the Rendering that can happen (RenderingData).
+* Rendering can happen more often then GameTicks and at any time between two GameTicks.
+* The Animation Distribution Logic must adjust to the Rendering that happens at any give point in time.
+*/
 void RunAnimationTest(int numFrames, int delay, AnimationFlags flags, int numSkippedFrames, int distributeFramesBeforeFrame, const std::vector<TestData *> &vecTestData)
 {
 	const int pnum = 0;