Fix non-deterministic test data in GLMPredMojoControlVariablesTest (#16771)

* Initial plan

* Use fixed seed and remove println in GLMPredMojoControlVariablesTest

Co-authored-by: tomasfryda <61695433+tomasfryda@users.noreply.github.com>

* Change SEED constant to 0x1CEDC0FFEEL

Co-authored-by: tomasfryda <61695433+tomasfryda@users.noreply.github.com>

* Change SEED to 0x1CEDCAFE (no L suffix needed)

Co-authored-by: tomasfryda <61695433+tomasfryda@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: tomasfryda <61695433+tomasfryda@users.noreply.github.com>

Author: Copilot

h2o-algos/src/test/java/hex/glm/GLMPredMojoControlVariablesTest.java

@@ -28,6 +28,7 @@
 public class GLMPredMojoControlVariablesTest extends TestUtil {
 
   double _tol = 1e-6;
+  private static final long SEED = 0x1CEDCAFE;
 
   @Test
   public void testGaussianPredMojoControlVariables() {
@@ -212,7 +213,7 @@ public void testBinomialWithValidationFramePredMojoControlVariables() {
   private Frame[] createAndSplitData(int responseFactors, boolean positiveResponse,
                                      boolean convertResponseToNumeric, String suffix) {
     CreateFrame cf = new CreateFrame();
-    Random generator = new Random();
+    Random generator = new Random(SEED);
     int numRows = generator.nextInt(10000) + 15000 + 200;
     int numCols = generator.nextInt(17) + 3;
     cf.rows = numRows;
@@ -222,9 +223,7 @@ private Frame[] createAndSplitData(int responseFactors, boolean positiveResponse
     cf.response_factors = responseFactors;
     cf.positive_response = positiveResponse;
     cf.missing_fraction = 0;
-    cf.seed = System.currentTimeMillis();
-    System.out.println("Createframe parameters: rows: " + numRows + " cols:" + numCols +
-            " seed: " + cf.seed + " family: " + suffix);
+    cf.seed = SEED;
 
     Frame trainData = cf.execImpl().get();
     if (convertResponseToNumeric) {
@@ -252,7 +251,7 @@ private Frame[] createAndSplitData(int responseFactors, boolean positiveResponse
   private Frame[] createAndSplitData3Way(int responseFactors, boolean positiveResponse,
                                          boolean convertResponseToNumeric, String suffix) {
     CreateFrame cf = new CreateFrame();
-    Random generator = new Random();
+    Random generator = new Random(SEED);
     int numRows = generator.nextInt(10000) + 15000 + 200;
     int numCols = generator.nextInt(17) + 3;
     cf.rows = numRows;
@@ -262,9 +261,7 @@ private Frame[] createAndSplitData3Way(int responseFactors, boolean positiveResp
     cf.response_factors = responseFactors;
     cf.positive_response = positiveResponse;
     cf.missing_fraction = 0;
-    cf.seed = System.currentTimeMillis();
-    System.out.println("Createframe parameters: rows: " + numRows + " cols:" + numCols +
-            " seed: " + cf.seed + " family: " + suffix);
+    cf.seed = SEED;
 
     Frame trainData = cf.execImpl().get();
     if (convertResponseToNumeric) {