From 58b29adc88343fe0821c008ba0f0bb1e8018574d Mon Sep 17 00:00:00 2001
From: Alexander Harkness <me@bearbin.net>
Date: Wed, 3 Aug 2016 08:35:42 +0100
Subject: Fixed cFastRandom Test. (#3291)

This resolves #3290
---
 tests/CMakeLists.txt                |  1 +
 tests/FastRandom/CMakeLists.txt     | 44 +++++++++++++++++++++++
 tests/FastRandom/FastRandomTest.cpp | 71 +++++++++++++++++++++++++++++++++++++
 3 files changed, 116 insertions(+)
 create mode 100644 tests/FastRandom/CMakeLists.txt
 create mode 100644 tests/FastRandom/FastRandomTest.cpp

(limited to 'tests')

diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 235ebe60d..0e7b51445 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -10,6 +10,7 @@ add_subdirectory(BoundingBox)
 add_subdirectory(ByteBuffer)
 add_subdirectory(ChunkData)
 add_subdirectory(CompositeChat)
+add_subdirectory(FastRandom)
 add_subdirectory(HTTP)
 add_subdirectory(LoadablePieces)
 add_subdirectory(Network)
diff --git a/tests/FastRandom/CMakeLists.txt b/tests/FastRandom/CMakeLists.txt
new file mode 100644
index 000000000..a9d62bf94
--- /dev/null
+++ b/tests/FastRandom/CMakeLists.txt
@@ -0,0 +1,44 @@
+enable_testing()
+add_definitions(-DTEST_GLOBALS=1)
+
+include_directories(${CMAKE_SOURCE_DIR}/src/)
+
+add_definitions(-DTEST_GLOBALS=1)
+
+set (SHARED_SRCS
+	${CMAKE_SOURCE_DIR}/src/FastRandom.cpp
+	${CMAKE_SOURCE_DIR}/src/OSSupport/StackTrace.cpp
+)
+
+set (SHARED_HDRS
+	${CMAKE_SOURCE_DIR}/src/FastRandom.h
+	${CMAKE_SOURCE_DIR}/src/OSSupport/StackTrace.h
+)
+
+set (SRCS
+	FastRandomTest.cpp
+)
+
+if (MSVC)
+	# Add the MSVC-specific LeakFinder / StackTracer sources:
+	list (APPEND SHARED_SRCS ${CMAKE_SOURCE_DIR}/src/LeakFinder.cpp ${CMAKE_SOURCE_DIR}/src/StackWalker.cpp)
+	list (APPEND SHARED_HDRS ${CMAKE_SOURCE_DIR}/src/LeakFinder.h   ${CMAKE_SOURCE_DIR}/src/StackWalker.h)
+endif()
+
+source_group("Shared" FILES ${SHARED_SRCS} ${SHARED_HDRS})
+source_group("Sources" FILES ${SRCS})
+add_executable(FastRandom-exe ${SRCS} ${SHARED_SRCS} ${SHARED_HDRS})
+if (WIN32)
+	target_link_libraries(FastRandom-exe ws2_32)
+endif()
+add_test(NAME FastRandom-test COMMAND FastRandom-exe)
+
+
+
+
+
+# Put the projects into solution folders (MSVC):
+set_target_properties(
+	FastRandom-exe
+	PROPERTIES FOLDER Tests
+)
diff --git a/tests/FastRandom/FastRandomTest.cpp b/tests/FastRandom/FastRandomTest.cpp
new file mode 100644
index 000000000..e7729382d
--- /dev/null
+++ b/tests/FastRandom/FastRandomTest.cpp
@@ -0,0 +1,71 @@
+
+// FastRandomTest.cpp
+
+// Tests the randomness of cFastRandom
+
+#include "Globals.h"
+#include "FastRandom.h"
+
+
+static void TestInts(void)
+{
+	cFastRandom rnd;
+	int sum = 0;
+	const int BUCKETS = 8;
+	int Counts[BUCKETS];
+	memset(Counts, 0, sizeof(Counts));
+	const int ITER = 10000;
+	for (int i = 0; i < ITER; i++)
+	{
+		int v = rnd.NextInt(1000);
+		assert_test(v >= 0);
+		assert_test(v < 1000);
+		Counts[v % BUCKETS]++;
+		sum += v;
+	}
+	double avg = static_cast<double>(sum) / ITER;
+	printf("avg: %f\n", avg);
+	for (int i = 0; i < BUCKETS; i++)
+	{
+		printf("  bucket %d: %d\n", i, Counts[i]);
+	}
+}
+
+
+static void TestFloats(void)
+{
+	cFastRandom rnd;
+	float sum = 0;
+	const int BUCKETS = 8;
+	int Counts[BUCKETS];
+	memset(Counts, 0, sizeof(Counts));
+	const int ITER = 10000;
+	for (int i = 0; i < ITER; i++)
+	{
+		float v = rnd.NextFloat(1000);
+		assert_test(v >= 0);
+		assert_test(v <= 1000);
+		Counts[static_cast<int>(v) % BUCKETS]++;
+		sum += v;
+	}
+	sum = sum / ITER;
+	printf("avg: %f\n", sum);
+	for (int i = 0; i < BUCKETS; i++)
+	{
+		printf("  bucket %d: %d\n", i, Counts[i]);
+	}
+}
+
+
+int main(void)
+{
+	LOGD("FastRandom Test started");
+
+	LOGD("Testing ints");
+	TestInts();
+
+	LOGD("Testing floats");
+	TestFloats();
+
+	LOG("FastRandom test finished");
+}
-- 
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