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JAVA-22516 Split or move core-java-io-apis-2 module (moved-1) (#14361)

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* JAVA-22516 Split or move core-java-io-apis-2 module (moved-1)

* JAVA-22516 Adding back the file after fixing the conflicts

---------

Co-authored-by: timis1 <noreplay@yahoo.com>
This commit is contained in:
timis1
2023-07-14 20:30:39 +03:00
committed by GitHub
parent 346418a266
commit f2ab4c2aa8
33 changed files with 461 additions and 369 deletions
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core-java-modules/core-java-io-apis/src/test/java/com/baeldung/bufferedreadervsfilereader/BufferedReaderUnitTest.java
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package com.baeldung.bufferedreadervsfilereader;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import org.junit.jupiter.api.Test;
class BufferedReaderUnitTest {
@Test
void whenReadingAFile_thenReadsLineByLine() {
StringBuilder result = new StringBuilder();
final Path filePath = new File("src/test/resources/sampleText1.txt").toPath();
try (BufferedReader br = new BufferedReader(new InputStreamReader(Files.newInputStream(filePath), StandardCharsets.UTF_8))) {
String line;
while((line = br.readLine()) != null) {
result.append(line);
result.append('\n');
}
} catch (IOException e) {
e.printStackTrace();
}
assertEquals("first line\nsecond line\nthird line\n", result.toString());
}
}
core-java-modules/core-java-io-apis/src/test/java/com/baeldung/bufferedreadervsfilereader/FileReaderUnitTest.java
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package com.baeldung.bufferedreadervsfilereader;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.io.FileReader;
import java.io.IOException;
import org.junit.jupiter.api.Test;
class FileReaderUnitTest {
@Test
void whenReadingAFile_thenReadsCharByChar() {
StringBuilder result = new StringBuilder();
try (FileReader fr = new FileReader("src/test/resources/sampleText2.txt")) {
int i = fr.read();
while(i != -1) {
result.append((char)i);
i = fr.read();
}
} catch (IOException e) {
e.printStackTrace();
}
assertEquals("qwerty", result.toString());
}
}
core-java-modules/core-java-io-apis/src/test/java/com/baeldung/multinput/TestMultipleInputsUnitTest.java
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package com.baeldung.multinput;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.InputMismatchException;
import org.junit.jupiter.api.Assertions;
import org.testng.annotations.Test;
public class TestMultipleInputsUnitTest {
@Test
public void givenMultipleInputs_whenUsingSpaceDelimiter_thenExpectPrintingOutputs() {
String input = "10 20\n";
InputStream in = new ByteArrayInputStream(input.getBytes());
System.setIn(in);
MultiInputs mi = new MultiInputs();
mi.UsingSpaceDelimiter();
// You can add assertions here to verify the behavior of the method
}
@Test
public void givenMultipleInputs_whenUsingREDelimiter_thenExpectPrintingOutputs() {
String input = "30, 40\n";
InputStream in = new ByteArrayInputStream(input.getBytes());
System.setIn(in);
MultiInputs mi = new MultiInputs();
mi.UsingREDelimiter();
// You can add assertions here to verify the behavior of the method
}
@Test
public void givenMultipleInputs_whenUsingCustomDelimiter_thenExpectPrintingOutputs() {
String input = "50; 60\n";
InputStream in = new ByteArrayInputStream(input.getBytes());
System.setIn(in);
MultiInputs mi = new MultiInputs();
mi.UsingCustomDelimiter();
// You can add assertions here to verify the behavior of the method
}
@Test
public void givenInvalidInput_whenUsingSpaceDelimiter_thenExpectInputMismatchException() {
String input = "abc\n";
InputStream in = new ByteArrayInputStream(input.getBytes());
System.setIn(in);
MultiInputs mi = new MultiInputs();
Assertions.assertThrows(InputMismatchException.class, mi::UsingSpaceDelimiter);
}
}
core-java-modules/core-java-io-apis/src/test/java/com/baeldung/outputtofile/ConsoleOutputToFileUnitTest.java
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package com.baeldung.outputtofile;
import static org.junit.jupiter.api.Assertions.assertLinesMatch;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;
import com.google.common.collect.Lists;
class DualPrintStream extends PrintStream {
private final PrintStream second;
public DualPrintStream(OutputStream main, PrintStream second) {
super(main);
this.second = second;
}
@Override
public void close() {
super.close();
second.close();
}
@Override
public void flush() {
super.flush();
second.flush();
}
@Override
public void write(byte[] buf, int off, int len) {
super.write(buf, off, len);
second.write(buf, off, len);
}
@Override
public void write(int b) {
super.write(b);
second.write(b);
}
@Override
public void write(byte[] b) throws IOException {
super.write(b);
second.write(b);
}
}
public class ConsoleOutputToFileUnitTest {
// @formatter:off
private final static List<String> OUTPUT_LINES = Lists.newArrayList(
"I came",
"I saw",
"I conquered");
// @formatter:on
@Test
void whenReplacingSystemOutPrintStreamWithFileOutputStream_thenOutputsGoToFile(@TempDir Path tempDir) throws IOException {
PrintStream originalOut = System.out;
Path outputFilePath = tempDir.resolve("file-output.txt");
PrintStream out = new PrintStream(Files.newOutputStream(outputFilePath), true);
System.setOut(out);
OUTPUT_LINES.forEach(line -> System.out.println(line));
assertTrue(outputFilePath.toFile()
.exists(), "The file exists");
assertLinesMatch(OUTPUT_LINES, Files.readAllLines(outputFilePath));
System.setOut(originalOut);
}
@Test
void whenUsingDualPrintStream_thenOutputsGoToConsoleAndFile(@TempDir Path tempDir) throws IOException {
PrintStream originalOut = System.out;
Path outputFilePath = tempDir.resolve("dual-output.txt");
DualPrintStream dualOut = new DualPrintStream(Files.newOutputStream(outputFilePath), System.out);
System.setOut(dualOut);
OUTPUT_LINES.forEach(line -> System.out.println(line));
assertTrue(outputFilePath.toFile()
.exists(), "The file exists");
assertLinesMatch(OUTPUT_LINES, Files.readAllLines(outputFilePath));
System.setOut(originalOut);
}
}
core-java-modules/core-java-io-apis/src/test/java/com/baeldung/scanner/JavaScannerUnitTest.java
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package com.baeldung.scanner;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.util.Locale;
import java.util.NoSuchElementException;
import java.util.Scanner;
import org.junit.Test;
public class JavaScannerUnitTest {
@Test
public void whenReadFileWithScanner_thenCorrect() throws IOException {
final Scanner scanner = new Scanner(new File("src/test/resources/test_read.in"));
assertTrue(scanner.hasNext());
assertEquals("Hello", scanner.next());
assertEquals("world", scanner.next());
scanner.close();
}
@Test
public void whenConvertInputStreamToString_thenConverted() throws IOException {
final String expectedValue = "Hello world";
final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
final Scanner scanner = new Scanner(inputStream);
scanner.useDelimiter("\\A");
final String result = scanner.next();
assertEquals(expectedValue, result);
scanner.close();
}
@Test
public void whenReadUsingBufferedReader_thenCorrect() throws IOException {
final String firstLine = "Hello world";
final String secondLine = "Hi, John";
final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/test_read_multiple.in"));
String result = reader.readLine();
assertEquals(firstLine, result);
result = reader.readLine();
assertEquals(secondLine, result);
reader.close();
}
@Test
public void whenReadUsingScanner_thenCorrect() throws IOException {
final String firstLine = "Hello world";
final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read_multiple.in");
final Scanner scanner = new Scanner(inputStream);
final String result = scanner.nextLine();
assertEquals(firstLine, result);
scanner.useDelimiter(", ");
assertEquals("Hi", scanner.next());
assertEquals("John", scanner.next());
scanner.close();
}
@Test
public void whenReadingInputFromConsole_thenCorrect() {
final String input = "Hello";
final InputStream stdin = System.in;
System.setIn(new ByteArrayInputStream(input.getBytes()));
final Scanner scanner = new Scanner(System.in);
final String result = scanner.next();
assertEquals(input, result);
System.setIn(stdin);
scanner.close();
}
@Test
public void whenValidateInputUsingScanner_thenValidated() throws IOException {
final String input = "2000";
final InputStream stdin = System.in;
System.setIn(new ByteArrayInputStream(input.getBytes()));
final Scanner scanner = new Scanner(System.in);
final boolean isIntInput = scanner.hasNextInt();
assertTrue(isIntInput);
System.setIn(stdin);
scanner.close();
}
@Test
public void whenScanString_thenCorrect() throws IOException {
final String input = "Hello 1 F 3.5";
final Scanner scanner = new Scanner(input);
scanner.useLocale(Locale.US);
assertEquals("Hello", scanner.next());
assertEquals(1, scanner.nextInt());
assertEquals(15, scanner.nextInt(16));
assertEquals(3.5, scanner.nextDouble(), 0.00000001);
scanner.close();
}
@Test
public void whenFindPatternUsingScanner_thenFound() throws IOException {
final String expectedValue = "world";
final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
final Scanner scanner = new Scanner(inputStream);
final String result = scanner.findInLine("wo..d");
assertEquals(expectedValue, result);
scanner.close();
}
@Test
public void whenFindPatternInHorizon_thenFound() throws IOException {
final String expectedValue = "world";
final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
final Scanner scanner = new Scanner(inputStream);
String result = scanner.findWithinHorizon("wo..d", 5);
assertNull(result);
result = scanner.findWithinHorizon("wo..d", 100);
assertEquals(expectedValue, result);
scanner.close();
}
@Test
public void whenSkipPatternUsingScanner_thenSkiped() throws IOException {
final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
final Scanner scanner = new Scanner(inputStream);
scanner.skip(".e.lo");
assertEquals("world", scanner.next());
scanner.close();
}
@Test
public void whenChangeScannerDelimiter_thenChanged() throws IOException {
final String expectedValue = "Hello world";
final String[] splited = expectedValue.split("o");
final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
final Scanner scanner = new Scanner(inputStream);
scanner.useDelimiter("o");
assertEquals(splited[0], scanner.next());
assertEquals(splited[1], scanner.next());
assertEquals(splited[2], scanner.next());
scanner.close();
}
@Test
public void whenReadWithScannerTwoDelimiters_thenCorrect() throws IOException {
final Scanner scanner = new Scanner(new File("src/test/resources/test_read_d.in"));
scanner.useDelimiter(",|-");
assertEquals("John", scanner.next());
assertEquals("Adam", scanner.next());
assertEquals("Tom", scanner.next());
scanner.close();
}
@Test(expected = NoSuchElementException.class)
public void givenClosingScanner_whenReading_thenThrowException() throws IOException {
final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
final Scanner scanner = new Scanner(inputStream);
scanner.next();
scanner.close();
final Scanner scanner2 = new Scanner(inputStream);
scanner2.next();
scanner2.close();
}
}
core-java-modules/core-java-io-apis/src/test/java/com/baeldung/scannernextline/ScannerNextLineUnitTest.java
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package com.baeldung.scannernextline;
import org.junit.Test;
import java.util.NoSuchElementException;
import java.util.Scanner;
import static org.junit.Assert.assertEquals;
public class ScannerNextLineUnitTest {
@Test
public void whenReadingLines_thenCorrect() {
String input = "Scanner\nTest\n";
try (Scanner scanner = new Scanner(input)) {
assertEquals("Scanner", scanner.nextLine());
assertEquals("Test", scanner.nextLine());
}
}
@Test
public void whenReadingPartialLines_thenCorrect() {
String input = "Scanner\n";
try (Scanner scanner = new Scanner(input)) {
scanner.useDelimiter("");
scanner.next();
assertEquals("canner", scanner.nextLine());
}
}
@Test(expected = NoSuchElementException.class)
public void givenNoNewLine_whenReadingNextLine_thenThrowNoSuchElementException() {
try (Scanner scanner = new Scanner("")) {
String result = scanner.nextLine();
}
}
@Test(expected = IllegalStateException.class)
public void givenScannerIsClosed_whenReadingNextLine_thenThrowIllegalStateException() {
Scanner scanner = new Scanner("");
scanner.close();
String result = scanner.nextLine();
}
}
core-java-modules/core-java-io-apis/src/test/resources/test_read.in
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Hello world
core-java-modules/core-java-io-apis/src/test/resources/test_read_d.in
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John,Adam-Tom
core-java-modules/core-java-io-apis/src/test/resources/test_read_multiple.in
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Hello world
Hi, John