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Add unit tests for ParseInteger (#4228)

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Albina Gimaletdinova
2023-07-02 11:31:55 +03:00
committed by GitHub
parent 4b45ac7e71
commit 2456d86432
3 changed files with 48 additions and 11 deletions
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44
src/test/java/com/thealgorithms/maths/ParseIntegerTest.java Normal file
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package com.thealgorithms.maths;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
/**
* @author Albina Gimaletdinova on 01/07/2023
*/
public class ParseIntegerTest {
private static final String NULL_PARAMETER_MESSAGE = "Input parameter must not be null!";
private static final String INCORRECT_FORMAT_MESSAGE = "Input parameter of incorrect format";
@Test
public void testNullInput() {
IllegalArgumentException exception = Assertions.assertThrows(IllegalArgumentException.class, () -> ParseInteger.parseInt(null));
Assertions.assertEquals(exception.getMessage(), NULL_PARAMETER_MESSAGE);
}
@Test
public void testInputOfIncorrectFormat() {
IllegalArgumentException exception = Assertions.assertThrows(NumberFormatException.class, () -> ParseInteger.parseInt("+0a123"));
Assertions.assertTrue(exception.getMessage().contains(INCORRECT_FORMAT_MESSAGE));
exception = Assertions.assertThrows(NumberFormatException.class, () -> ParseInteger.parseInt("b"));
Assertions.assertTrue(exception.getMessage().contains(INCORRECT_FORMAT_MESSAGE));
}
@Test
public void testPositiveValueIsSuccessfullyConverted() {
Assertions.assertEquals(ParseInteger.parseInt("0"), Integer.parseInt("0"));
Assertions.assertEquals(ParseInteger.parseInt("123"), Integer.parseInt("123"));
Assertions.assertEquals(ParseInteger.parseInt("0123"), Integer.parseInt("0123"));
Assertions.assertEquals(ParseInteger.parseInt("+0123"), Integer.parseInt("+0123"));
Assertions.assertEquals(ParseInteger.parseInt("+123"), Integer.parseInt("+123"));
}
@Test
public void testNegativeValueIsSuccessfullyConverted() {
Assertions.assertEquals(ParseInteger.parseInt("-1"), Integer.parseInt("-1"));
Assertions.assertEquals(ParseInteger.parseInt("-123"), Integer.parseInt("-123"));
Assertions.assertEquals(ParseInteger.parseInt("-0123"), Integer.parseInt("-0123"));
Assertions.assertEquals(ParseInteger.parseInt("-00123"), Integer.parseInt("-00123"));
}
}