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Doha2012Doha2012
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add class JavaScannerTest
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‎core-java/src/test/java/org/baeldung/java/io/JavaScannerTest.java‎

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package org.baeldung.java.io;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNull;
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import static org.junit.Assert.assertTrue;
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import java.io.BufferedReader;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Scanner;
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import org.junit.Test;
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public class JavaScannerTest {
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@Test
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public void whenReadFileWithScanner_thenCorrect() throws IOException {
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final Scanner scanner = new Scanner(new File("src/test/resources/test_read.in"));
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assertTrue(scanner.hasNext());
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assertEquals("Hello", scanner.next());
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assertEquals("world", scanner.next());
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scanner.close();
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}
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@Test
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public void whenConvertInputStreamToString_thenConverted() throws IOException {
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final String expectedValue = "Hello world";
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final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
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final Scanner scanner = new Scanner(inputStream);
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scanner.useDelimiter("\\A");
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final String result = scanner.next();
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assertEquals(expectedValue, result);
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scanner.close();
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}
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@Test
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public void whenReadUsingBufferedReader_thenCorrect() throws IOException {
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final String firstLine = "Hello world";
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final String secondLine = "Hi, John";
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final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/test_read_multiple.in"));
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String result = reader.readLine();
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assertEquals(firstLine, result);
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result = reader.readLine();
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assertEquals(secondLine, result);
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reader.close();
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}
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@Test
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public void whenReadUsingScanner_thenCorrect() throws IOException {
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final String firstLine = "Hello world";
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final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read_multiple.in");
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final Scanner scanner = new Scanner(inputStream);
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final String result = scanner.nextLine();
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assertEquals(firstLine, result);
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scanner.useDelimiter(", ");
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assertEquals("Hi", scanner.next());
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assertEquals("John", scanner.next());
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scanner.close();
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}
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@Test
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public void whenReadInputFromConsole_thenCorrect() {
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final String input = "Hello";
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final InputStream stdin = System.in;
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System.setIn(new ByteArrayInputStream(input.getBytes()));
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final Scanner scanner = new Scanner(System.in);
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final String result = scanner.next();
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assertEquals(input, result);
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System.setIn(stdin);
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scanner.close();
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}
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@Test
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public void whenValidateInputUsingScanner_thenValidated() throws IOException {
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final String input = "2000";
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final InputStream stdin = System.in;
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System.setIn(new ByteArrayInputStream(input.getBytes()));
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final Scanner scanner = new Scanner(System.in);
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final boolean isIntInput = scanner.hasNextInt();
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assertTrue(isIntInput);
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System.setIn(stdin);
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scanner.close();
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}
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@Test
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public void whenScanString_thenCorrect() throws IOException {
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final String input = "Hello 1 F 3.5";
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final Scanner scanner = new Scanner(input);
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assertEquals("Hello", scanner.next());
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assertEquals(1, scanner.nextInt());
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assertEquals(15, scanner.nextInt(16));
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assertEquals(3.5, scanner.nextDouble(), 0.00000001);
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scanner.close();
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}
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@Test
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public void whenFindPatternUsingScanner_thenFound() throws IOException {
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final String expectedValue = "world";
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final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
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final Scanner scanner = new Scanner(inputStream);
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final String result = scanner.findInLine("wo..d");
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assertEquals(expectedValue, result);
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scanner.close();
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}
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@Test
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public void whenFindPatternInHorizon_thenFound() throws IOException {
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final String expectedValue = "world";
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final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
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final Scanner scanner = new Scanner(inputStream);
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String result = scanner.findWithinHorizon("wo..d", 5);
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assertNull(result);
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result = scanner.findWithinHorizon("wo..d", 100);
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assertEquals(expectedValue, result);
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scanner.close();
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}
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@Test
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public void whenSkipPatternUsingScanner_thenSkiped() throws IOException {
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final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
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final Scanner scanner = new Scanner(inputStream);
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scanner.skip(".e.lo");
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assertEquals("world", scanner.next());
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scanner.close();
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}
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@Test
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public void whenChangeScannerDelimiter_thenChanged() throws IOException {
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final String expectedValue = "Hello world";
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final String[] splited = expectedValue.split("o");
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final FileInputStream inputStream = new FileInputStream("src/test/resources/test_read.in");
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final Scanner scanner = new Scanner(inputStream);
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scanner.useDelimiter("o");
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assertEquals(splited[0], scanner.next());
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assertEquals(splited[1], scanner.next());
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assertEquals(splited[2], scanner.next());
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scanner.close();
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}
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@Test
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public void whenReadWithScannerTwoDelimiters_thenCorrect() throws IOException {
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final Scanner scanner = new Scanner(new File("src/test/resources/test_read_d.in"));
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scanner.useDelimiter(",|-");
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assertEquals("John", scanner.next());
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assertEquals("Adam", scanner.next());
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assertEquals("Tom", scanner.next());
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scanner.close();
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}
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}

‎core-java/src/test/resources/test_read_d.in‎

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John,Adam-Tom

‎core-java/src/test/resources/test_read_multiple.in‎

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Hello world
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Hi, John

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