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// Copyright (C) 2012 The Android Open Source Project
//
// 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.google.gerrit.server.ioutil;
import java.io.PrintWriter;
import java.io.StringWriter;
import org.junit.Assert;
import org.junit.Test;
public class ColumnFormatterTest {
/**
* Holds an in-memory {@link java.io.PrintWriter} object and allows comparisons of its contents to
* a supplied string via an assert statement.
*/
static class PrintWriterComparator {
private PrintWriter printWriter;
private StringWriter stringWriter;
PrintWriterComparator() {
stringWriter = new StringWriter();
printWriter = new PrintWriter(stringWriter);
}
public void assertEquals(String str) {
printWriter.flush();
Assert.assertEquals(stringWriter.toString(), str);
}
public PrintWriter getPrintWriter() {
return printWriter;
}
}
/** Test that only lines with at least one column of text emit output. */
@Test
public void emptyLine() {
final PrintWriterComparator comparator = new PrintWriterComparator();
final ColumnFormatter formatter = new ColumnFormatter(comparator.getPrintWriter(), '\t');
formatter.addColumn("foo");
formatter.addColumn("bar");
formatter.nextLine();
formatter.nextLine();
formatter.nextLine();
formatter.addColumn("foo");
formatter.addColumn("bar");
formatter.finish();
comparator.assertEquals("foo\tbar\nfoo\tbar\n");
}
/** Test that there is no output if no columns are ever added. */
@Test
public void emptyOutput() {
final PrintWriterComparator comparator = new PrintWriterComparator();
final ColumnFormatter formatter = new ColumnFormatter(comparator.getPrintWriter(), '\t');
formatter.nextLine();
formatter.nextLine();
formatter.finish();
comparator.assertEquals("");
}
/**
* Test that there is no output (nor any exceptions) if we finalize the output immediately after
* the creation of the {@link ColumnFormatter}.
*/
@Test
public void noNextLine() {
final PrintWriterComparator comparator = new PrintWriterComparator();
final ColumnFormatter formatter = new ColumnFormatter(comparator.getPrintWriter(), '\t');
formatter.finish();
comparator.assertEquals("");
}
/**
* Test that the text in added columns is escaped while the column separator (which of course
* shouldn't be escaped) is left alone.
*/
@Test
public void escapingTakesPlace() {
final PrintWriterComparator comparator = new PrintWriterComparator();
final ColumnFormatter formatter = new ColumnFormatter(comparator.getPrintWriter(), '\t');
formatter.addColumn("foo");
formatter.addColumn("\tan indented multi-line\ntext");
formatter.nextLine();
formatter.finish();
comparator.assertEquals("foo\t\\tan indented multi-line\\ntext\n");
}
/**
* Test that we get the correct output with multi-line input where the number of columns in each
* line varies.
*/
@Test
public void multiLineDifferentColumnCount() {
final PrintWriterComparator comparator = new PrintWriterComparator();
final ColumnFormatter formatter = new ColumnFormatter(comparator.getPrintWriter(), '\t');
formatter.addColumn("foo");
formatter.addColumn("bar");
formatter.addColumn("baz");
formatter.nextLine();
formatter.addColumn("foo");
formatter.addColumn("bar");
formatter.nextLine();
formatter.finish();
comparator.assertEquals("foo\tbar\tbaz\nfoo\tbar\n");
}
/** Test that we get the correct output with a single column of input. */
@Test
public void oneColumn() {
final PrintWriterComparator comparator = new PrintWriterComparator();
final ColumnFormatter formatter = new ColumnFormatter(comparator.getPrintWriter(), '\t');
formatter.addColumn("foo");
formatter.nextLine();
formatter.finish();
comparator.assertEquals("foo\n");
}
}
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