unit-testing-exercise-java

Instrucciones.md

#Ejercicio didáctico de pruebas unitarias de software# El programa acepta como entrada una cadena de caracteres, la salida es una lista de los caracteres que esten rodeados por guiones "-".

Por ejemplo: Entrada: aaa-bb-ccc Salida: [bb]

##Restricción arbitraria## Se restringe el uso de expresiones regulares. El programa Main.java debe de ser modificado de tal manera que no se haga uso de la clase java.util.regex.Pattern.

##Archivos##

• Main.java (implementación inicial propuesta por el docente).
• MainTest.java (pruebas unitarias) (requiere JUnit 4)

Para correr las pruebas desde la línea de comandos: java -cp /usr/share/java/junit.jar org.junit.runner.JUnitCore MainTest

Main.java

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {

    public static void main(String[] args) {

        String input = args[0];
        List<String> output = captureItemsBetweenDashes(input);
        System.out.println(output);
    }

    static List<String> captureItemsBetweenDashes(String input) {

        List<String> captured = new ArrayList<String>();
        Matcher m = Pattern.compile("-([^-]+)-").matcher(input);
        while (m.find()) {
            captured.add(m.group(1));
        }
        return captured;
    }
}

MainTest.java

import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertFalse;
import static junit.framework.Assert.assertTrue;

import org.junit.Test;

public class MainTest {

    @Test
    public void should_return_empty_list_for_no_matches() {
        assertTrue(Main.captureItemsBetweenDashes("").isEmpty());
    }

    @Test
    public void should_capture_nothing_if_just_one_dash_is_present() {
        assertTrue(Main.captureItemsBetweenDashes("-").isEmpty());
    }

    @Test
    public void should_not_capture_empty_item() {
        assertTrue(Main.captureItemsBetweenDashes("--").isEmpty());
    }

    @Test
    public void should_capture_single_item() {
        String input = "-1-";
        assertFalse(Main.captureItemsBetweenDashes(input).isEmpty());
        assertEquals(1, Main.captureItemsBetweenDashes(input).size());
        assertEquals("1", Main.captureItemsBetweenDashes(input).get(0));
    }

    @Test
    public void should_capture_single_item_with_trailing_dash() {
        String input = "-1--";
        assertFalse(Main.captureItemsBetweenDashes(input).isEmpty());
        assertEquals(1, Main.captureItemsBetweenDashes(input).size());
        assertEquals("1", Main.captureItemsBetweenDashes(input).get(0));
    }

    @Test
    public void should_capture_single_item_with_leading_dash() {
        String input = "--1-";
        assertFalse(Main.captureItemsBetweenDashes(input).isEmpty());
        assertEquals(1, Main.captureItemsBetweenDashes(input).size());
        assertEquals("1", Main.captureItemsBetweenDashes(input).get(0));
    }

    @Test
    public void should_capture_multiple_items() {
        String input = "-1-22222-3-";
        assertFalse(Main.captureItemsBetweenDashes(input).isEmpty());
        assertEquals(2, Main.captureItemsBetweenDashes(input).size());
        assertEquals("1", Main.captureItemsBetweenDashes(input).get(0));
        assertEquals("2", Main.captureItemsBetweenDashes(input).get(1));
    }
}