Implement RNG class unit tests

tests/Algorithm/RNGTests.cpp

@@ -0,0 +1,130 @@
+#include <gtest/gtest.h>
+#include <J3ML/Algorithm/RNG.h>
+
+using J3ML::Algorithm::RNG;
+
+TEST(Rng, IntFast)
+{
+    RNG rng;
+    u32 prev = rng.IntFast();
+
+    for (int i = 0; i < 1000; ++i)
+    {
+        u32 next = rng.IntFast();
+        assert(next != prev);
+        prev = next;
+    }
+}
+
+TEST(Rng, Int)
+{
+    RNG rng;
+    assert(rng.lastNumber != 0 || rng.increment != 0);
+    bool allEqual = true;
+    for (int i = 0; i < 1000; ++i)
+    {
+        int prev = rng.Int();
+        int next = rng.Int();
+        assert(prev != 0 || next != 0);
+        if (prev != next)
+            allEqual = false;
+    }
+    assert(!allEqual);
+
+}
+TEST(Rng, Int_A_B)
+{
+    RNG rng;
+    for (int i = 0; i < 1000; ++i)
+    {
+        int a = rng.Int();
+        int b = rng.Int();
+        if (b < a)
+            Swap(a, b);
+        int val = rng.Int(a, b);
+        assert( a <= val);
+        assert(val <= b);
+    }
+}
+TEST(Rng, Float)
+{
+    RNG rng;
+    bool allEqual = true;
+    for (int i = 0; i < 1000; ++i)
+    {
+        float f = rng.Float();
+        float f2 = rng.Float();
+        assert(f < 1.f);
+        assert(f >= 0.f);
+        assert(f != 0.f || f2 != 0.f);
+
+        if (f != f2)
+            allEqual = false;
+    }
+    assert(!allEqual);
+}
+TEST(Rng, Float01Incl)
+{
+    RNG rng;
+    bool allEqual = true;
+    for (int i = 0; i < 1000; ++i)
+    {
+        float f = rng.Float01Incl();
+        float f2 = rng.Float01Incl();
+
+        assert(f <= 1.f);
+        assert(f >= 0.f);
+        assert(f != 0.f || f2 != 0.f);
+        if (f != f2)
+            allEqual = false;
+    }
+    assert(!allEqual);
+}
+TEST(Rng, FloatNeg1_1)
+{
+    RNG rng;
+    bool allEqual = true;
+    for (int i = 0; i < 1000; ++i)
+    {
+        float f = rng.FloatNeg1_1();
+        float f2 = rng.FloatNeg1_1();
+        assert(f < 1.f);
+        assert(f > -1.f);
+        assert(f != 0.f || f2 != 0.f);
+        if (f != f2)
+            allEqual = false;
+    }
+    assert(!allEqual);
+}
+TEST(Rng, Float_A_B)
+{
+    RNG rng;
+    for (int i = 0; i < 1000; ++i)
+    {
+        float a = rng.Float();
+        float b = rng.Float();
+        if (a == b)
+            continue;
+        if (b < a)
+            Swap(a, b);
+
+        float f = rng.Float(a, b);
+        assert(a <= f);
+        assert(f < b);
+    }
+}
+TEST(Rng, Float_A_B_Incl)
+{
+    RNG rng;
+    for (int i = 0; i < 1000; ++i)
+    {
+        float a = rng.Float();
+        float b = rng.Float();
+        if (b > a)
+            Swap(a, b);
+
+        float f = rng.FloatIncl(a, b);
+        assert(a <= f);
+        assert(f <= b);
+    }
+}