added sampler utility test

com.unity.perception/Tests/Runtime/Randomization/SamplerTests/SamplerUtilityTests.cs

+using NUnit.Framework;
+using UnityEngine.Perception.Randomization.Samplers;
+
+namespace RandomizationTests.SamplerTests
+{
+    [TestFixture]
+    public class SamplerUtilityTests
+    {
+        [Test]
+        public void SeedIteratedByChangingEitherBaseSeedOrIndex()
+        {
+            // Check if changing the index changes the generated random state
+            var iteratedIndex1 = SamplerUtility.IterateSeed(0, 0);
+            var iteratedIndex2 = SamplerUtility.IterateSeed(1, 0);
+            Assert.AreNotEqual(iteratedIndex1, iteratedIndex2);
+
+            // Check if changing the seed changes the generated random state
+            var iteratedSeed1 = SamplerUtility.IterateSeed(0, 0);
+            var iteratedSeed2 = SamplerUtility.IterateSeed(0, 1);
+            Assert.AreNotEqual(iteratedSeed1, iteratedSeed2);
+        }
+    }
+}

com.unity.perception/Tests/Runtime/Randomization/SamplerTests/SamplerUtilityTests.cs.meta

+fileFormatVersion: 2
+guid: b2db5be5ad4544b899d7bed088b7b762
+timeCreated: 1597985947