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/*
* 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.harmony.testframework;
import junit.framework.Assert;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.Random;
/**
* Tests behaviour common to all implementations of {@link Writer}. This adapts
* writers that collects untransformed chars so that they may be tested.
*/
public abstract class CharSinkTester {
private boolean throwsExceptions = true;
/**
* Creates a new writer ready to receive an arbitrary number of chars. Each
* time this method is invoked, any previously returned writers may be
* discarded.
*/
public abstract Writer create() throws Exception;
/**
* Returns the current set of chars written to the writer last returned by
* {@link #create}, and releases any resources held by that writer.
*/
public abstract char[] getChars() throws Exception;
/**
* Configures whether the writer is expected to throw exceptions when an
* error is encountered. Classes like {@code PrintWriter} report errors via
* an API method instead.
*/
public CharSinkTester setThrowsExceptions(boolean throwsExceptions) {
this.throwsExceptions = throwsExceptions;
return this;
}
public final TestSuite createTests() {
TestSuite result = new TestSuite();
result.addTest(new SinkTestCase("sinkTestNoWriting"));
result.addTest(new SinkTestCase("sinkTestWriteZeroChars"));
result.addTest(new SinkTestCase("sinkTestWriteCharByChar"));
result.addTest(new SinkTestCase("sinkTestWriteArray"));
result.addTest(new SinkTestCase("sinkTestWriteOffset"));
result.addTest(new SinkTestCase("sinkTestWriteLargeArray"));
if (throwsExceptions) {
result.addTest(new SinkTestCase("sinkTestWriteAfterClose"));
} else {
result.addTest(new SinkTestCase("sinkTestWriteAfterCloseSuppressed"));
}
return result;
}
@Override
public String toString() {
return getClass().getName();
}
private static void assertArrayEquals(char[] expected, char[] actual) {
Assert.assertEquals(Arrays.toString(expected), Arrays.toString(actual));
}
public class SinkTestCase extends TestCase {
private SinkTestCase(String name) {
super(name);
}
public void sinkTestNoWriting() throws Exception {
char[] expected = new char[] { };
Writer out = create();
out.close();
assertArrayEquals(expected, getChars());
}
public void sinkTestWriteZeroChars() throws Exception {
char[] expected = new char[] { };
Writer out = create();
char[] a = new char[1024];
out.write(a, 1000, 0);
out.write(a, 0, 0);
out.write(new char[] { });
out.close();
assertArrayEquals(expected, getChars());
}
public void sinkTestWriteCharByChar() throws Exception {
char[] expected = "EFGCDECBA".toCharArray();
Writer out = create();
for (char c : expected) {
out.write(c);
}
out.close();
assertArrayEquals(expected, getChars());
}
public void sinkTestWriteArray() throws Exception {
char[] expected = "EFGCDECBA".toCharArray();
Writer out = create();
out.write("EF".toCharArray());
out.write("GCDE".toCharArray());
out.write("CBA".toCharArray());
out.close();
assertArrayEquals(expected, getChars());
}
public void sinkTestWriteOffset() throws Exception {
char[] expected = "EFGCDECBA".toCharArray();
Writer out = create();
char[] a = new char[1024];
a[1000] = 'E';
a[1001] = 'F';
out.write(a, 1000, 2);
char[] b = new char[1024];
b[1020] = 'G';
b[1021] = 'C';
b[1022] = 'D';
b[1023] = 'E';
out.write(b, 1020, 4);
char[] c = new char[1024];
c[0] = 'C';
c[1] = 'B';
c[2] = 'A';
out.write(c, 0, 3);
out.close();
assertArrayEquals(expected, getChars());
}
public void sinkTestWriteLargeArray() throws Exception {
Random dice = new Random();
char[] expected = new char[(1024 * 1024) + 1]; // 2 MB + 1 char
for (int c = 0; c < expected.length; c++) {
expected[c] = (char) ('A' + dice.nextInt(26));
}
Writer out = create();
out.write(expected);
out.close();
assertArrayEquals(expected, getChars());
}
public void sinkTestWriteAfterClose() throws Exception {
char[] expectedChars = "EF".toCharArray();
Writer out = create();
out.write(expectedChars);
out.close();
try {
out.write("GCDE".toCharArray());
fail("expected already closed exception");
} catch (IOException expected) {
}
assertArrayEquals(expectedChars, getChars());
}
public void sinkTestWriteAfterCloseSuppressed() throws Exception {
Writer out = create();
out.write("EF".toCharArray());
out.close();
out.write("GCDE".toCharArray()); // no exception expected!
}
// adding a new test? Don't forget to update createTests().
@Override
public String getName() {
return CharSinkTester.this.toString() + ":" + super.getName();
}
}
}
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