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BAEL-3214 | Unit tests for class FileWriter

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Nikunj Gandhi 2019-09-08 16:27:20 -04:00
parent dea5dafd1d
commit f66e0d8053
1 changed files with 123 additions and 0 deletions
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core-java-modules/core-java-io-2/src/test/java/com/baeldung/filewriter/FileWriterExampleTest.java Normal file
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package com.baeldung.filewriter;
import static org.junit.Assert.assertEquals;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import org.junit.After;
import org.junit.Test;
public class FileWriterExampleTest {
@After
public void tearDown() throws IOException {
Files.delete(Path.of("src/test/resources/FileWriterTest.txt"));
}
@Test
public void testFileWriter_Constructor_With_FileName() throws IOException {
try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt")) {
fileWriter.write("Hello Folks!");
}
assertEquals("Hello Folks!", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
}
@Test
public void testFileWriter_Constructor_With_FileName_And_Charset() throws IOException {
try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt", Charset.forName("US-ASCII"))) {
fileWriter.write("Hello Folks! Let us learn the Façade design pattern");
}
System.out.println(new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
assertEquals("Hello Folks! Let us learn the Fa?ade design pattern", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
}
@Test
public void testFileWriter_Constructor_With_FileName_And_AppendFlag() throws IOException {
try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt")) {
fileWriter.write("Hello Folks!");
}
try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt", true)) {
fileWriter.write("Let us learn the Façade design pattern");
}
assertEquals("Hello Folks!Let us learn the Façade design pattern", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
}
@Test
public void testFileWriter_Constructor_With_FileName_And_Charset_And_AppendFlag() throws IOException {
try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt", Charset.forName("US-ASCII"))) {
fileWriter.write("Hello Folks!");
}
try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt", Charset.forName("US-ASCII"), true)) {
fileWriter.write("Let us learn the Façade design pattern");
}
assertEquals("Hello Folks!Let us learn the Fa?ade design pattern", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
}
@Test
public void testFileWriter_Constructor_With_File() throws IOException {
try (FileWriter fileWriter = new FileWriter(new File("src/test/resources/FileWriterTest.txt"))) {
fileWriter.write("Hello Folks!");
}
assertEquals("Hello Folks!", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
}
@Test
public void testFileWriter_Constructor_With_File_And_Charset() throws IOException {
try (FileWriter fileWriter = new FileWriter(new File("src/test/resources/FileWriterTest.txt"), Charset.forName("US-ASCII"))) {
fileWriter.write("Hello Folks!Let us learn the Façade design pattern");
}
assertEquals("Hello Folks!Let us learn the Fa?ade design pattern", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
}
@Test
public void testFileWriter_Constructor_With_File_And_AppendFlag() throws IOException {
try (FileWriter fileWriter = new FileWriter(new File("src/test/resources/FileWriterTest.txt"))) {
fileWriter.write("Hello Folks!");
}
try (FileWriter fileWriter = new FileWriter(new File("src/test/resources/FileWriterTest.txt"), true)) {
fileWriter.write("Let us learn the Façade design pattern");
}
assertEquals("Hello Folks!Let us learn the Façade design pattern", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
}
@Test
public void testFileWriter_Constructor_With_File_And_Charset_And_AppendFlag() throws IOException {
try (FileWriter fileWriter = new FileWriter(new File("src/test/resources/FileWriterTest.txt"), Charset.forName("US-ASCII"))) {
fileWriter.write("Hello Folks!");
}
try (FileWriter fileWriter = new FileWriter(new File("src/test/resources/FileWriterTest.txt"), Charset.forName("US-ASCII"), true)) {
fileWriter.write("Let us learn the Façade design pattern");
}
assertEquals("Hello Folks!Let us learn the Fa?ade design pattern", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
}
@Test
public void testFileWriter_Constructor_With_FileDescriptor() throws FileNotFoundException, IOException {
try(FileOutputStream fos = new FileOutputStream(new File("src/test/resources/FileWriterTest.txt"));
FileWriter fileWriter = new FileWriter(fos.getFD())){
fileWriter.write("Hello Folks!");
}
assertEquals("Hello Folks!", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
}
}