Create Robot.java

#606 Robot pattern issue

Author: Basmalamoustafa

templateview/src/main/java/com/iluwatar/templateview/Robot.java

@@ -0,0 +1,32 @@
+package com.iluwatar.templateview;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class TemplateViewRobot {
+
+  private final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+  private final PrintStream originalOut = System.out;
+  public TemplateViewRobot render(TemplateView view) {
+    try {
+      System.setOut(new PrintStream(outputStream));
+      view.render();
+    } finally {
+      System.setOut(originalOut);
+    }
+    return this;
+  }
+
+  public TemplateViewRobot verifyContent(String expectedContent) {
+    String renderedOutput = outputStream.toString();
+    assertTrue(renderedOutput.contains(expectedContent), 
+        String.format("Expected content '%s' not found in output:\n%s", expectedContent, renderedOutput));
+    return this;
+  }
+
+  public TemplateViewRobot reset() {
+    outputStream.reset();
+    return this;
+  }
+}