1 files changed, 62 insertions, 0 deletions
diff --git a/test/unit/app/system_windows_test.cpp b/test/unit/app/system_windows_test.cpp
new file mode 100644
index 0000000..79f8c7f
--- /dev/null
+++ b/test/unit/app/system_windows_test.cpp
@@ -0,0 +1,62 @@
+#include "app/system.h"
+#include "app/system_windows.h"
+
+#include <gtest/gtest.h>
+
+class CSystemUtilsWindowsWrapper : public CSystemUtilsWindows
+{
+public:
+    CSystemUtilsWindowsWrapper() {}
+
+    void SetFrequency(long long counterFrequency)
+    {
+        m_counterFrequency = counterFrequency;
+    }
+};
+
+class SystemUtilsWindowsUT : public testing::Test
+{
+protected:
+    static const long long SEC = 1000000000;
+
+    CSystemUtilsWindowsWrapper systemUtils;
+};
+
+
+TEST_F(SystemUtilsWindowsUT, TimerResolution)
+{
+    systemUtils.SetFrequency(SEC);
+    EXPECT_EQ(1u, systemUtils.GetTimeStampExactResolution());
+
+    systemUtils.SetFrequency(SEC/3);
+    EXPECT_EQ(3u, systemUtils.GetTimeStampExactResolution());
+}
+
+TEST_F(SystemUtilsWindowsUT, TimeStampDiff)
+{
+    systemUtils.SetFrequency(SEC);
+
+    SystemTimeStamp before, after;
+
+    before.counterValue = 100;
+    after.counterValue = 200;
+
+    long long tDiff = systemUtils.TimeStampExactDiff(&before, &after);
+    EXPECT_EQ( 100, tDiff);
+
+    tDiff = systemUtils.TimeStampExactDiff(&after, &before);
+    EXPECT_EQ(-100, tDiff);
+
+    // -------
+
+    systemUtils.SetFrequency(SEC/3);
+
+    before.counterValue = 200;
+    after.counterValue = 400;
+
+    tDiff = systemUtils.TimeStampExactDiff(&before, &after);
+    EXPECT_EQ( 200*3, tDiff);
+
+    tDiff = systemUtils.TimeStampExactDiff(&after, &before);
+    EXPECT_EQ(-200*3, tDiff);
+}