/*
* Copyright 2012-present Facebook, Inc.
*
* Licensed 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 com.facebook.buck.util;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import java.io.StringReader;
import org.junit.Test;
public class LineFetcherTest {
private static final String TEST_LINE_1 = "Test1";
private static final String TEST_LINE_2 = "Test2";
@Test
public void testUnterminateLineIsReadAsSingleLine() throws Exception {
String[] expected = {TEST_LINE_1};
verifyLineFetcherResponses(TEST_LINE_1, expected);
}
@Test
public void testNewLineLineEnding() throws Exception {
verifyLineEndingBehaviour("\n");
}
@Test
public void testCarriageReturnLineEnding() throws Exception {
verifyLineEndingBehaviour("\r");
}
@Test
public void testDOSLineEndingIsTreatedAsOneLineEnding() throws Exception {
verifyLineEndingBehaviour("\r\n");
}
private void verifyLineEndingBehaviour(String lineEnding) throws Exception {
String[] expected = {TEST_LINE_1, TEST_LINE_2};
verifyLineFetcherResponses(TEST_LINE_1 + lineEnding + TEST_LINE_2, expected);
}
@Test
public void testBufferSizedLine() throws Exception {
verifyLineEndingAtSpecificPlace(LineFetcher.BUFFER_LENGTH, "\r");
}
@Test
public void testLineOverBufferSize() throws Exception {
verifyLineEndingAtSpecificPlace(LineFetcher.BUFFER_LENGTH + 1, "\r");
}
@Test
public void testDOSLineEndingStartingOnBuffersEdge() throws Exception {
verifyLineEndingAtSpecificPlace(LineFetcher.BUFFER_LENGTH - 1, "\r\n");
}
@Test
public void testDoubleBufferSizeLineLength() throws Exception {
verifyLineEndingAtSpecificPlace(LineFetcher.BUFFER_LENGTH * 2, "\r");
}
@Test
public void testTrippleBufferSizeLineLength() throws Exception {
verifyLineEndingAtSpecificPlace(LineFetcher.BUFFER_LENGTH * 3, "\r");
}
private void verifyLineEndingAtSpecificPlace(int lineEndLocation, String lineEnding)
throws Exception {
StringBuilder builder =
new StringBuilder(lineEndLocation + lineEnding.length() + TEST_LINE_2.length());
for (int i = 0; i < lineEndLocation; i++) {
builder.append('X');
}
String[] expected = {builder.toString(), TEST_LINE_2};
builder.append(lineEnding);
builder.append(TEST_LINE_2);
verifyLineFetcherResponses(builder.toString(), expected);
}
private void verifyLineFetcherResponses(String sample, String[] expectedResponses)
throws Exception {
try (LineFetcher fetcher = new LineFetcher(new StringReader(sample))) {
for (int i = 0; i < expectedResponses.length; i++) {
assertEquals(
"Mismatch in expected and actual response from LineFetcher",
expectedResponses[i],
fetcher.readLine());
}
assertNull(
"LineFetcher had unexpected data after it should have finished", fetcher.readLine());
}
}
}