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authorAlexander Harkness <me@bearbin.net>2016-08-03 09:35:42 +0200
committerMattes D <github@xoft.cz>2016-08-03 09:35:42 +0200
commit58b29adc88343fe0821c008ba0f0bb1e8018574d (patch)
tree50d314d6558a9f32cbbffd4b67c99fc3405569ee /tests/FastRandom/FastRandomTest.cpp
parentSimplified cChunkMap chunk storage (#2565) (diff)
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Diffstat (limited to 'tests/FastRandom/FastRandomTest.cpp')
-rw-r--r--tests/FastRandom/FastRandomTest.cpp71
1 files changed, 71 insertions, 0 deletions
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");
+}