preserves the test case seed value during a debug session, closes #675

src/main/java/de/neemann/digital/gui/Main.java

@@ -1194,6 +1194,9 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
             if (tsl.isEmpty())
                 throw new TestingDataException(Lang.get("err_noTestData"));
 
+            for (Circuit.TestCase tc : tsl)
+                tc.getTestCaseDescription().setNewSeed();
+
             windowPosManager.register("testResult", new ValueTableDialog(Main.this, Lang.get("msg_testResult"))
                     .addTestResult(tsl, circuitComponent.getCircuit(), library))
                     .setVisible(true);

src/main/java/de/neemann/digital/testing/TestCaseDescription.java

@@ -7,6 +7,7 @@ package de.neemann.digital.testing;
 
 import de.neemann.digital.lang.Lang;
 import de.neemann.digital.testing.parser.*;
+import de.neemann.digital.testing.parser.functions.Random;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -20,6 +21,8 @@ public class TestCaseDescription {
     private transient ArrayList<String> names;
     private transient ArrayList<VirtualSignal> virtualSignals;
     private transient ModelInitializer modelInitializer;
+    private transient Random random;
+    private transient long seed;
 
 
     /**
@@ -48,6 +51,14 @@ public class TestCaseDescription {
      */
     public TestCaseDescription(TestCaseDescription valueToCopy) {
         this.dataString = valueToCopy.dataString;
+        this.seed = valueToCopy.seed;
+    }
+
+    /**
+     * Creates a new seed value
+     */
+    public void setNewSeed() {
+        seed = 0;
     }
 
     /**
@@ -65,6 +76,9 @@ public class TestCaseDescription {
                 throw new TestingDataException(Lang.get("err_errorParsingTestdata"), e);
             }
         }
+        if (seed == 0)
+            seed = System.currentTimeMillis();
+        random.setSeed(seed);
     }
 
     private void parseDataString() throws IOException, ParserException {
@@ -73,6 +87,7 @@ public class TestCaseDescription {
         names = tdp.getNames();
         virtualSignals = tdp.getVirtualSignals();
         modelInitializer = tdp.getModelInitializer();
+        random = tdp.getRandom();
     }
 
     /**

src/main/java/de/neemann/digital/testing/parser/Parser.java

@@ -37,6 +37,7 @@ public class Parser {
     private final ArrayList<VirtualSignal> virtualSignals;
     private final Tokenizer tok;
     private final HashMap<String, Function> functions = new HashMap<>();
+    private final Random random;
     private LineEmitter emitter;
 
     /**
@@ -46,7 +47,8 @@ public class Parser {
      */
     public Parser(String data) {
         functions.put("signExt", new SignExtend());
-        functions.put("random", new Random());
+        random = new Random();
+        functions.put("random", random);
         functions.put("ite", new IfThenElse());
         names = new ArrayList<>();
         virtualSignals = new ArrayList<>();
@@ -302,6 +304,13 @@ public class Parser {
         return modelInit;
     }
 
+    /**
+     * @return the random function
+     */
+    public Random getRandom() {
+        return random;
+    }
+
     /**
      * @return the line emitter
      */

src/main/java/de/neemann/digital/testing/parser/functions/Random.java

@@ -17,15 +17,27 @@ import java.util.ArrayList;
  */
 public class Random extends Function {
 
+    private final java.util.Random rnd;
+
     /**
      * Creates a new function
      */
     public Random() {
         super(1);
+        this.rnd = new java.util.Random();
+    }
+
+    /**
+     * Sets the random seed
+     *
+     * @param seed the seed
+     */
+    public void setSeed(long seed) {
+        rnd.setSeed(seed);
     }
 
     @Override
     public long calcValue(Context c, ArrayList<Expression> args) throws ParserException {
-        return (long) (Math.random() * args.get(0).value(c));
+        return (long) (rnd.nextDouble() * args.get(0).value(c));
     }
 }