Preserve RNG state integrity in case unit tests would be run concurrently.
diff --git a/commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/optim/nonlinear/scalar/noderiv/OptimTestUtils.java b/commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/optim/nonlinear/scalar/noderiv/OptimTestUtils.java
index 283f0ff..46837fb 100644
--- a/commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/optim/nonlinear/scalar/noderiv/OptimTestUtils.java
+++ b/commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/optim/nonlinear/scalar/noderiv/OptimTestUtils.java
@@ -19,6 +19,7 @@
import java.util.Arrays;
import org.apache.commons.rng.UniformRandomProvider;
import org.apache.commons.rng.simple.RandomSource;
+import org.apache.commons.rng.simple.ThreadLocalRandomSource;
import org.apache.commons.rng.sampling.distribution.MarsagliaNormalizedGaussianSampler;
import org.apache.commons.rng.sampling.distribution.ContinuousUniformSampler;
import org.apache.commons.math4.legacy.analysis.MultivariateFunction;
@@ -113,7 +114,7 @@
/** Creates a RNG instance. */
static UniformRandomProvider rng() {
- return RandomSource.MWC_256.create();
+ return ThreadLocalRandomSource.current(RandomSource.MWC_256);
}
private static class Basis {
