package com.epam.rd.autotasks.segments;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import java.util.StringJoiner;
import java.util.stream.Stream;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
public class SegmentTest {
@Test
void testConstructor() {
new Segment(new Point(0, 0), new Point(1, 1));
new Segment(new Point(-2, 2), new Point(-3, 1));
}
@Test
void testConstructorSameStartEndCase() {
assertThrows(RuntimeException.class, () -> {
Point p = new Point(3, 7);
new Segment(p, p);
});
}
@Test
void testConstructorEqualStartEndCase() {
assertThrows(RuntimeException.class, () -> {
new Segment(new Point(3, 7), new Point(3, 7));
});
}
@Test
void testConstructorNullStartCase() {
assertThrows(RuntimeException.class, () -> {
new Segment(null, new Point(3, 7));
});
}
@Test
void testConstructorNullEndCase() {
assertThrows(RuntimeException.class, () -> {
new Segment(new Point(3, 7), null);
});
}
@Test
void testConstructorNullStartEndCase() {
assertThrows(RuntimeException.class, () -> {
new Segment(null, null);
});
}
@ParameterizedTest
@MethodSource("lengthTestCases")
void testLength(final Point start, final Point end, final double expected) {
double length = new Segment(start, end).length();
assertEquals(expected, length, 0.001, "Error on " + segmentCaseToString(start, end));
}
@ParameterizedTest
@MethodSource("middleTestCases")
void testMiddle(final Point expected, final Segment segment) {
final Point actual = segment.middle();
assertEquals(expected.getX(), actual.getX(), 0.001);
assertEquals(expected.getY(), actual.getY(), 0.001);
}
@ParameterizedTest
@MethodSource("intersectionTestCases")
void testIntersection(final Segment a, final Segment b, final Point expected) {
final Point actual = a.intersection(b);
if (expected == null) {
assertNull(actual);
return;
}
assertNotNull(actual);
assertEquals(expected.getX(), actual.getX(), 0.001);
assertEquals(expected.getY(), actual.getY(), 0.001);
}
static Stream<Arguments> lengthTestCases() {
return Stream.of(
Arguments.of(new Point(0, 0), new Point(3, 4), 5),
Arguments.of(new Point(3, 4), new Point(0, 0), 5),
Arguments.of(new Point(-3, 4), new Point(0, 0), 5),
Arguments.of(new Point(-3, -4), new Point(0, 0), 5),
Arguments.of(new Point(0, 0), new Point(3, -4), 5),
Arguments.of(new Point(-3, 8), new Point(6, 2), Math.sqrt(117)),
Arguments.of(new Point(0, 0), new Point(1, 1), Math.sqrt(2)),
Arguments.of(new Point(-2, -2), new Point(1, 1), Math.sqrt(18))
);
}
static Stream<Arguments> middleTestCases() {
return Stream.of(
Arguments.of(new Point(0.5, 0.5), new Segment(new Point(0, 0), new Point(1, 1))),
Arguments.of(new Point(-1.5, 0.5), new Segment(new Point(-1, -1), new Point(-2, 2))),
Arguments.of(new Point(4.5, 1.5), new Segment(new Point(0, 3), new Point(9, 0))),
Arguments.of(new Point(1, 1), new Segment(new Point(0, 2), new Point(2, 0))),
Arguments.of(new Point(2, 1.5), new Segment(new Point(0, 3), new Point(4, 0))),
Arguments.of(new Point(0, -1), new Segment(new Point(-1, -3), new Point(1, 1))),
Arguments.of(new Point(0, 2), new Segment(new Point(0, 1), new Point(0, 3)))
);
}
static Stream<Arguments> intersectionTestCases() {
return Stream.of(
Arguments.of(
new Segment(new Point(0, 3), new Point(9, 0)),
new Segment(new Point(0, 2), new Point(10, 0)),
new Point(7.5, 0.5)
),
Arguments.of(
new Segment(new Point(0, 0), new Point(3, 4)),
new Segment(new Point(0, 0), new Point(5, 100)),
new Point(0, 0)
),
Arguments.of(
new Segment(new Point(2, 5), new Point(5, 1)),
new Segment(new Point(0, 2), new Point(5, 5)),
new Point(2.9310344827586206, 3.7586206896551726)
),
Arguments.of(
new Segment(new Point(2, 5), new Point(0.5, 1.5)),
new Segment(new Point(0, 2), new Point(5, 5)),
new Point(0.9615384615384616, 2.576923076923077)
),
Arguments.of(
new Segment(new Point(2, 5), new Point(0.5, 1.5)),
new Segment(new Point(0, 2), new Point(2, 5)),
new Point(2, 5)
),
Arguments.of(
new Segment(new Point(-3, 0.5), new Point(0.5, 1.5)),
new Segment(new Point(0, 2), new Point(-3, -1.5)),
new Point(-0.7297297297297297, 1.1486486486486487)
),
Arguments.of(
new Segment(new Point(0, 0), new Point(1, 1)),
new Segment(new Point(1, 1), new Point(2, 2)),
null
),
Arguments.of(
new Segment(new Point(0, 0), new Point(1, 1)),
new Segment(new Point(2, 2), new Point(3, 3)),
null
),
Arguments.of(
new Segment(new Point(0, 0), new Point(2, 2)),
new Segment(new Point(2, 2), new Point(1, 1)),
null
),
Arguments.of(
new Segment(new Point(0, 0), new Point(1, 1)),
new Segment(new Point(-1, -1), new Point(-2, 2)),
null
),
Arguments.of(
new Segment(new Point(0, 3), new Point(9, 0)),
new Segment(new Point(0, 2), new Point(2, 0)),
null
),
Arguments.of(
new Segment(new Point(0, 3), new Point(4, 0)),
new Segment(new Point(-1, -3), new Point(1, 1)),
null
)
);
}
private String segmentCaseToString(Point start, Point end) {
return new StringJoiner("->", "[", "]")
.add(pointToString(start))
.add(pointToString(end))
.toString();
}
private String pointToString(final Point point) {
if (point == null) {
return null;
}
return new StringJoiner(";", "(", ")")
.add(Double.toString(point.getX()))
.add(Double.toString(point.getY()))
.toString();
}
}
