1 files changed, 24 insertions, 0 deletions
diff --git a/Source/UnitTests/Core/MMIOTest.cpp b/Source/UnitTests/Core/MMIOTest.cpp
new file mode 100644
index 0000000000..97cabda658
--- /dev/null
+++ b/Source/UnitTests/Core/MMIOTest.cpp
@@ -0,0 +1,24 @@
+#include <unordered_set>
+#include <gtest/gtest.h>
+
+#include "Common/CommonTypes.h"
+#include "Core/HW/MMIO.h"
+
+// Tests that the UniqueID function returns a "unique enough" identifier
+// number: that is, it is unique in the address ranges we care about.
+TEST(UniqueID, UniqueEnough)
+{
+	std::unordered_set<u32> ids;
+	for (u32 i = 0xCC000000; i < 0xCC010000; ++i)
+	{
+		u32 unique_id = MMIO::UniqueID(i);
+		EXPECT_EQ(ids.end(), ids.find(unique_id));
+		ids.insert(unique_id);
+	}
+	for (u32 i = 0xCD000000; i < 0xCD010000; ++i)
+	{
+		u32 unique_id = MMIO::UniqueID(i);
+		EXPECT_EQ(ids.end(), ids.find(unique_id));
+		ids.insert(unique_id);
+	}
+}