109 lines
1.8 KiB
C++
109 lines
1.8 KiB
C++
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// FastRandomTest.cpp
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// Tests the randomness of cFastRandom
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#include "Globals.h"
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#include "../TestHelpers.h"
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#include "FastRandom.h"
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static void TestInts(void)
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{
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cFastRandom rnd;
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int sum = 0;
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const int BUCKETS = 8;
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int Counts[BUCKETS] = {0};
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const int ITER = 10000;
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for (int i = 0; i < ITER; i++)
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{
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int v = rnd.RandInt(1000);
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TEST_GREATER_THAN_OR_EQUAL(v, 0);
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TEST_LESS_THAN_OR_EQUAL(v, 1000);
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Counts[v % BUCKETS]++;
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sum += v;
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}
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double avg = static_cast<double>(sum) / ITER;
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LOG("avg: %f", avg);
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for (int i = 0; i < BUCKETS; i++)
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{
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LOG(" bucket %d: %d", i, Counts[i]);
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}
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}
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static void TestFloats(void)
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{
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cFastRandom rnd;
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float sum = 0;
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const int BUCKETS = 8;
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int Counts[BUCKETS] = {0};
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const int ITER = 10000;
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for (int i = 0; i < ITER; i++)
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{
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float v = rnd.RandReal(1000.0f);
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TEST_GREATER_THAN_OR_EQUAL(v, 0);
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TEST_LESS_THAN_OR_EQUAL(v, 1000);
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Counts[static_cast<int>(v) % BUCKETS]++;
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sum += v;
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}
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sum = sum / ITER;
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LOG("avg: %f", sum);
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for (int i = 0; i < BUCKETS; i++)
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{
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LOG(" bucket %d: %d", i, Counts[i]);
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}
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}
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/** Checks whether re-creating the cFastRandom class produces the same initial number over and over (#2935) */
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static void TestReCreation(void)
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{
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const int ITER = 10000;
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int lastVal = 0;
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int numSame = 0;
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int maxNumSame = 0;
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for (int i = 0; i < ITER; ++i)
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{
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cFastRandom rnd;
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int val = rnd.RandInt(9);
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if (val == lastVal)
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{
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numSame += 1;
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}
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else
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{
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if (numSame > maxNumSame)
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{
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maxNumSame = numSame;
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}
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numSame = 0;
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lastVal = val;
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}
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}
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if (numSame > maxNumSame)
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{
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maxNumSame = numSame;
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}
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LOG("Out of %d creations, there was a chain of at most %d same numbers generated.", ITER, maxNumSame);
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}
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IMPLEMENT_TEST_MAIN("FastRandom",
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TestInts();
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TestFloats();
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TestReCreation();
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)
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