diff --git a/src/main/java/de/neemann/digital/gui/components/testing/TestResultDialog.java b/src/main/java/de/neemann/digital/gui/components/testing/TestResultDialog.java
index 24bff568b..11bd4d5ab 100644
--- a/src/main/java/de/neemann/digital/gui/components/testing/TestResultDialog.java
+++ b/src/main/java/de/neemann/digital/gui/components/testing/TestResultDialog.java
@@ -9,6 +9,7 @@ import de.neemann.digital.draw.library.ElementNotFoundException;
 import de.neemann.digital.draw.model.ModelCreator;
 import de.neemann.digital.lang.Lang;
 import de.neemann.digital.testing.*;
+import de.neemann.gui.ErrorMessage;
 import de.neemann.gui.IconCreator;
 
 import javax.swing.*;
@@ -47,13 +48,16 @@ public class TestResultDialog extends JDialog {
         Collections.sort(tsl);
 
         JTabbedPane tp = new JTabbedPane();
-        int i=0;
-        int errorTabIndex=-1;
+        int i = 0;
+        int errorTabIndex = -1;
         for (TestSet ts : tsl) {
             Model model = new ModelCreator(circuit, library).createModel(false);
 
             TestResult tr = new TestResult(ts.data).create(model);
 
+            if (tr.getException() != null)
+                SwingUtilities.invokeLater(new ErrorMessage(Lang.get("msg_errorWhileExecutingTests_N0", ts.name)).addCause(tr.getException()).setComponent(this));
+
             JTable table = new JTable(new TestResultModel(tr));
             table.setDefaultRenderer(MatchedValue.class, new MatchedValueRenderer());
             table.setDefaultRenderer(Integer.class, new NumberRenderer());
@@ -67,12 +71,12 @@ public class TestResultDialog extends JDialog {
             } else {
                 tabName = Lang.get("msg_test_N_Failed", ts.name);
                 tabIcon = ICON_FAILED;
-                errorTabIndex=i;
+                errorTabIndex = i;
             }
             tp.addTab(tabName, tabIcon, new JScrollPane(table));
             i++;
         }
-        if (errorTabIndex>=0)
+        if (errorTabIndex >= 0)
             tp.setSelectedIndex(errorTabIndex);
 
         getContentPane().add(tp);
diff --git a/src/main/java/de/neemann/digital/gui/components/testing/TestResultModel.java b/src/main/java/de/neemann/digital/gui/components/testing/TestResultModel.java
index 41a388b0a..0aad91759 100644
--- a/src/main/java/de/neemann/digital/gui/components/testing/TestResultModel.java
+++ b/src/main/java/de/neemann/digital/gui/components/testing/TestResultModel.java
@@ -1,5 +1,6 @@
 package de.neemann.digital.gui.components.testing;
 
+import de.neemann.digital.lang.Lang;
 import de.neemann.digital.testing.MatchedValue;
 import de.neemann.digital.testing.TestResult;
 
@@ -37,7 +38,7 @@ public class TestResultModel implements TableModel {
     @Override
     public String getColumnName(int columnIndex) {
         if (columnIndex == 0)
-            return "No";
+            return Lang.get("number");
         else
             return testResult.getSignalName(columnIndex - 1);
     }
diff --git a/src/main/java/de/neemann/digital/testing/TestResult.java b/src/main/java/de/neemann/digital/testing/TestResult.java
index f7f7c7676..1035db5f2 100644
--- a/src/main/java/de/neemann/digital/testing/TestResult.java
+++ b/src/main/java/de/neemann/digital/testing/TestResult.java
@@ -23,6 +23,7 @@ public class TestResult {
     private final ArrayList<Value[]> lines;
     private final ArrayList<Value[]> results;
     private boolean allPassed;
+    private Exception exception;
 
     /**
      * Creates a new testing result
@@ -107,7 +108,13 @@ public class TestResult {
                             in.value.setBool(!in.value.getBool());
                 }
 
-                model.doStep();
+                try {
+                    model.doStep();
+                } catch (NodeException | RuntimeException e) {
+                    exception = e;
+                    allPassed = false;
+                    return this;
+                }
 
                 for (TestSignal out : outputs) {
                     MatchedValue matchedValue = new MatchedValue(row[out.index], out.value);
@@ -229,7 +236,7 @@ public class TestResult {
 
         @Override
         public T next() {
-            if (value==null)
+            if (value == null)
                 throw new NoSuchElementException();
             T r = value;
             value = null;
@@ -275,7 +282,7 @@ public class TestResult {
 
         @Override
         public Value[] next() {
-            if (n>=count)
+            if (n >= count)
                 throw new NoSuchElementException();
             int mask = 1;
             for (int in : dcIndex) {
@@ -287,4 +294,11 @@ public class TestResult {
             return row;
         }
     }
+
+    /**
+     * @return the exception thrown during test test execution, or null if there was no error.
+     */
+    public Exception getException() {
+        return exception;
+    }
 }
diff --git a/src/test/java/de/neemann/digital/integration/TestExamples.java b/src/test/java/de/neemann/digital/integration/TestExamples.java
index 5e7c947c1..4850dbce0 100644
--- a/src/test/java/de/neemann/digital/integration/TestExamples.java
+++ b/src/test/java/de/neemann/digital/integration/TestExamples.java
@@ -40,7 +40,7 @@ public class TestExamples extends TestCase {
     public void testTestExamples() throws Exception {
         File examples = new File(Resources.getRoot(), "/dig/test");
         assertEquals(42, new FileScanner(this::check).scan(examples));
-        assertEquals(33, testCasesInFiles);
+        assertEquals(35, testCasesInFiles);
     }