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cristianrosu94cristianrosu94
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BAEL-4394: Line at a given number tests
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‎core-java-modules/core-java-io-3/src/test/java/com/baeldung/linenumber/LineAtGivenNumberTest.java‎

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package com.baeldung.linenumber;
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import org.apache.commons.io.FileUtils;
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import org.apache.commons.io.IOUtils;
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import org.junit.Test;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.List;
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import java.util.Scanner;
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import java.util.stream.Stream;
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import static org.junit.Assert.assertEquals;
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public class LineAtGivenNumberTest {
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private static final String FILE_PATH = "src/test/resources/linesInput.txt";
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@Test
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public void givenFile_whenUsingBufferedReader_thenExtractedLineIsCorrect() throws IOException {
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try (BufferedReader br = Files.newBufferedReader(Paths.get(FILE_PATH))) {
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for (int i = 0; i < 3; i++) {
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br.readLine();
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}
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String extractedLine = br.readLine();
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String expectedLine = "Line 4";
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assertEquals(expectedLine, extractedLine);
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}
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}
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@Test
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public void givenFile_whenUsingScanner_thenExtractedLineIsCorrect() throws IOException {
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try (Scanner scanner = new Scanner(new File(FILE_PATH))) {
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for (int i = 0; i < 3; i++) {
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scanner.nextLine();
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}
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String extractedLine = scanner.nextLine();
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String expectedLine = "Line 4";
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assertEquals(expectedLine, extractedLine);
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}
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}
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@Test
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public void givenSmallFile_whenUsingFilesAPI_thenExtractedLineIsCorrect() throws IOException {
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String extractedLine = Files.readAllLines(Paths.get(FILE_PATH)).get(4);
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String expectedLine = "Line 5";
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assertEquals(expectedLine, extractedLine);
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}
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@Test
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public void givenLargeFile_whenUsingFilesAPI_thenExtractedLineIsCorrect() throws IOException {
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try (Stream<String> lines = Files.lines(Paths.get(FILE_PATH))) {
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String extractedLine = lines.skip(4).findFirst().get();
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String expectedLine = "Line 5";
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assertEquals(expectedLine, extractedLine);
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}
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}
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@Test
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public void givenFile_whenUsingFIleUtils_thenExtractedLineIsCorrect() throws IOException {
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ClassLoader classLoader = getClass().getClassLoader();
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File file = new File(classLoader.getResource("linesInput.txt").getFile());
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List<String> lines = FileUtils.readLines(file, "UTF-8");
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String extractedLine = lines.get(0);
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String expectedLine = "Line 1";
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assertEquals(expectedLine, extractedLine);
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}
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@Test
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public void givenFile_whenUsingIOUtils_thenExtractedLineIsCorrect() throws IOException {
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String fileContent = IOUtils.toString(new FileInputStream(FILE_PATH), StandardCharsets.UTF_8);
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String extractedLine = fileContent.split(System.lineSeparator())[0];
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String expectedLine = "Line 1";
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assertEquals(expectedLine, extractedLine);
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}
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}

‎core-java-modules/core-java-io-3/src/test/resources/linesInput.txt‎

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Line 1
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Line 2
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Line 3
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Line 4
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Line 5

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