JsonNumber_Test.java

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package com.bettercloud.vault.json;

import static org.junit.Assert.*;

import java.io.IOException;
import java.io.StringWriter;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;


@SuppressWarnings("PMD")
public class JsonNumber_Test {

    private StringWriter output;
    private JsonWriter writer;

    @Before
    public void setUp() {
        output = new StringWriter();
        writer = new JsonWriter(output);
    }

    @Test
    public void constructor_failsWithNull() {
        TestUtil.assertException(NullPointerException.class, "string is null", (Runnable) () -> new JsonNumber(null));
    }

    @Test
    public void write() throws IOException {
        new JsonNumber("23").write(writer);

        assertEquals("23", output.toString());
    }

    @Test
    public void toString_returnsInputString() {
        assertEquals("foo", new JsonNumber("foo").toString());
    }

    @Test
    public void isNumber() {
        assertTrue(new JsonNumber("23").isNumber());
    }

    @Test
    public void asInt() {
        assertEquals(23, new JsonNumber("23").asInt());
    }

    @Test(expected = NumberFormatException.class)
    public void asInt_failsWithExceedingValues() {
        new JsonNumber("10000000000").asInt();
    }

    @Test(expected = NumberFormatException.class)
    public void asInt_failsWithExponent() {
        new JsonNumber("1e5").asInt();
    }

    @Test(expected = NumberFormatException.class)
    public void asInt_failsWithFractional() {
        new JsonNumber("23.5").asInt();
    }

    @Test
    public void asLong() {
        assertEquals(23L, new JsonNumber("23").asLong());
    }

    @Test(expected = NumberFormatException.class)
    public void asLong_failsWithExceedingValues() {
        new JsonNumber("10000000000000000000").asLong();
    }

    @Test(expected = NumberFormatException.class)
    public void asLong_failsWithExponent() {
        new JsonNumber("1e5").asLong();
    }

    @Test(expected = NumberFormatException.class)
    public void asLong_failsWithFractional() {
        new JsonNumber("23.5").asLong();
    }

    @Test
    public void asFloat() {
        assertEquals(23.05f, new JsonNumber("23.05").asFloat(), 0);
    }

    @Test
    public void asFloat_returnsInfinityForExceedingValues() {
        assertEquals(Float.POSITIVE_INFINITY, new JsonNumber("1e50").asFloat(), 0);
        assertEquals(Float.NEGATIVE_INFINITY, new JsonNumber("-1e50").asFloat(), 0);
    }

    @Test
    public void asDouble() {
        double result = new JsonNumber("23.05").asDouble();

        assertEquals(23.05, result, 0);
    }

    @Test
    public void asDouble_returnsInfinityForExceedingValues() {
        assertEquals(Double.POSITIVE_INFINITY, new JsonNumber("1e500").asDouble(), 0);
        assertEquals(Double.NEGATIVE_INFINITY, new JsonNumber("-1e500").asDouble(), 0);
    }

    @Test
    public void equals_trueForSameInstance() {
        JsonNumber number = new JsonNumber("23");

        assertEquals(number, number);
    }

    @Test
    public void equals_trueForEqualNumberStrings() {
        assertEquals(new JsonNumber("23"), new JsonNumber("23"));
    }

    @Test
    public void equals_falseForDifferentNumberStrings() {
        assertNotEquals(new JsonNumber("23"), new JsonNumber("42"));
        assertNotEquals(new JsonNumber("1e+5"), new JsonNumber("1e5"));
    }

    @Test
    public void equals_falseForNull() {
        assertNotEquals(null, new JsonNumber("23"));
    }

    @Test
    public void equals_falseForSubclass() {
        assertNotEquals(new JsonNumber("23"), new JsonNumber("23") {
        });
    }

    @Test
    public void hashCode_equalsForEqualStrings() {
        assertEquals(new JsonNumber("23").hashCode(), new JsonNumber("23").hashCode());
    }

    @Test
    public void hashCode_differsForDifferentStrings() {
        assertNotEquals(new JsonNumber("23").hashCode(), new JsonNumber("42").hashCode());
    }

    @Test
    public void canBeSerializedAndDeserialized() throws Exception {
        JsonNumber number = new JsonNumber("3.14");

        Assert.assertEquals(number, TestUtil.serializeAndDeserialize(number));
    }

}