Directions.java

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package org.spongepowered.api.util;

import static org.junit.Assert.assertEquals;
import static org.spongepowered.api.math.Vectors.create3d;

import org.junit.Test;
import org.spongepowered.api.math.Vector3d;

public class DirectionTest {

    @Test
    public void testHorizontal() {
        for (int i = 0; i < 16; i++) {
            final Direction direction = Direction.values()[i];
            final double angle = i / 8D * Math.PI; // = i / (16 / 2 PI)
            final Vector3d vector = direction.toVector3d();
            assertEquals(direction.name() + "'s direction does not match the expected direction.", create3d(Math.sin(angle), 0, -Math.cos(angle)).normalize(), vector);
        }
    }

    @Test
    public void testGetOpposite() {
        for (final Direction direction : Direction.values()) {
            assertEquals("The opposite of the opposite should be the original value.", direction, direction.getOpposite().getOpposite());
        }
    }

    @Test
    public void testToVector3d() {
        for (final Direction direction : Direction.values()) {
            assertEquals("The length of the sum of the original and the opposite should be zero.", 0, direction.toVector3d().add(direction.getOpposite().toVector3d()).lengthSquared(), 0);
        }
    }

    @Test
    public void testGetClosest() {
        // assertEquals("The closest horizontal direction for the 0-Vector should be NORTH.",
        // Direction.NORTH, new Vector3d(0, 0, 0));
        for (final Direction direction : Direction.values()) {
            assertEquals("The closest direction for a direction should be the direction itself.", direction, Direction.getClosest(direction.toVector3d()));
        }
    }

    @Test
    public void testGetClosestHorizonal() {
        // assertEquals("The closest horizontal direction for the 0-Vector should be NORTH.",
        // Direction.NORTH, new Vector3d(0, 0, 0));
        for (final Direction direction : Direction.values()) {
            if (direction.isUpright()) {
                assertEquals("The closest horizontal direction for a vertical direction should be NORTH.", Direction.NORTH, Direction.getClosest(direction.toVector3d()));
            } else {
                assertEquals("The closest horizontal direction for a direction should be the direction itself.", direction, Direction.getClosest(direction.toVector3d()));
            }
        }
    }

}