diff --git a/gclc.system/src/main/java/net/bigeon/gclc/system/ExecSystemCommand.java b/gclc.system/src/main/java/net/bigeon/gclc/system/ExecSystemCommand.java
index 88dc150..335ac8d 100644
--- a/gclc.system/src/main/java/net/bigeon/gclc/system/ExecSystemCommand.java
+++ b/gclc.system/src/main/java/net/bigeon/gclc/system/ExecSystemCommand.java
@@ -89,8 +89,7 @@ public class ExecSystemCommand extends Command {
         try {
             proc = Runtime.getRuntime().exec(args);
         } catch (final IOException e2) {
-            LOGGER.log(Level.SEVERE, "Unable to run process", e2); //$NON-NLS-1$
-            return;
+            throw new CommandRunException("Unable to run process", e2);
         }
 
         final InputStream is = proc.getInputStream();
@@ -114,7 +113,9 @@ public class ExecSystemCommand extends Command {
         try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os))) {
             while (th.isAlive()) {
                 String user = in.prompt();
-                writer.write(user + EOL);
+                if (!user.isEmpty()) {
+                    writer.write(user + EOL);
+                }
             }
         } catch (final IOException e1) {
             throw new CommandRunException(CommandRunExceptionType.INTERACTION,
diff --git a/gclc.system/src/test/java/net/bigeon/gclc/system/ExecSystemCommandTest.java b/gclc.system/src/test/java/net/bigeon/gclc/system/ExecSystemCommandTest.java
new file mode 100644
index 0000000..4789afb
--- /dev/null
+++ b/gclc.system/src/test/java/net/bigeon/gclc/system/ExecSystemCommandTest.java
@@ -0,0 +1,41 @@
+package net.bigeon.gclc.system;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import net.bigeon.gclc.exception.CommandRunException;
+import net.bigeon.gclc.manager.ConsoleInput;
+import net.bigeon.gclc.manager.ConsoleOutput;
+import net.bigeon.gclc.utils.EmptyInput;
+import net.bigeon.gclc.utils.SinkOutput;
+
+public class ExecSystemCommandTest {
+
+    @Test
+    public void testExecSystemCommand() {
+        ExecSystemCommand cmd = new ExecSystemCommand("test");
+        assertEquals("Name should be preserved", "test", cmd.getCommandName());
+        assertNotNull("tip should be defined", cmd.tip());
+        assertNotNull("usage should be defined", cmd.usagePattern());
+        assertNotNull("usage should be defined", cmd.usageDetail());
+    }
+
+    @Test
+    public void testExecute() throws CommandRunException {
+        ConsoleOutput out = SinkOutput.INSTANCE;
+        ConsoleInput in = EmptyInput.INSTANCE;
+
+        ExecSystemCommand cmd = new ExecSystemCommand();
+        if (System.getProperty("os.name").contains("indows")) {
+            cmd.execute(out, in, "cmd", "/C", "dir");
+            try {
+                cmd.execute(out, in, "inexistent");
+                fail("Able to execute inexistent command in system");
+            } catch (CommandRunException e) {
+                // ok
+            }
+        }
+    }
+
+}