| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.uima.fit.util; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.PrintStream; |
| |
| import junit.framework.Assert; |
| |
| import org.apache.uima.fit.testing.util.HideOutput; |
| import org.junit.Test; |
| |
| /** |
| */ |
| |
| public class HideOutputTest { |
| |
| @Test |
| public void testHideOutput() throws IOException { |
| // message that will be written to stdout and stderr |
| String className = this.getClass().getName(); |
| String message = String.format("If you see this output, %s is failing\n", className); |
| |
| // redirect stdout and stderr to streams we can read strings from |
| PrintStream oldOut = System.out; |
| PrintStream oldErr = System.err; |
| ByteArrayOutputStream stringOut = new ByteArrayOutputStream(); |
| ByteArrayOutputStream stringErr = new ByteArrayOutputStream(); |
| System.setOut(new PrintStream(stringOut)); |
| System.setErr(new PrintStream(stringErr)); |
| try { |
| // check that nothing is written to stdout or stderr while hidden |
| HideOutput ho = new HideOutput(); |
| System.out.print(message); |
| System.err.print(message); |
| Assert.assertEquals("", stringOut.toString()); |
| Assert.assertEquals("", stringErr.toString()); |
| |
| // check that data is again written to stdout and stderr after restoring |
| ho.restoreOutput(); |
| System.out.print(message); |
| System.err.print(message); |
| Assert.assertEquals(message, stringOut.toString()); |
| Assert.assertEquals(message, stringErr.toString()); |
| } |
| // restore stdout and stderr at the end of the test |
| finally { |
| System.setOut(oldOut); |
| System.setErr(oldErr); |
| stringOut.close(); |
| stringErr.close(); |
| } |
| |
| } |
| } |