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Add test for ImageStrategy
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@Stypox
Stypox committed Sep 19, 2023
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195 changes: 195 additions & 0 deletions app/src/test/java/org/schabi/newpipe/util/image/ImageStrategyTest.java
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package org.schabi.newpipe.util.image;

import static org.junit.Assert.assertEquals;
import static org.schabi.newpipe.extractor.Image.HEIGHT_UNKNOWN;
import static org.schabi.newpipe.extractor.Image.WIDTH_UNKNOWN;
import static org.schabi.newpipe.util.image.ImageStrategy.choosePreferredImage;
import static org.schabi.newpipe.util.image.ImageStrategy.estimatePixelCount;

import org.junit.Test;
import org.schabi.newpipe.extractor.Image;
import org.schabi.newpipe.extractor.Image.ResolutionLevel;

import java.util.List;

public class ImageStrategyTest {

private static final List<ResolutionLevel> RESOLUTION_LEVELS = List.of(
ResolutionLevel.LOW, ResolutionLevel.MEDIUM, ResolutionLevel.HIGH);

private Image img(final int height, final int width) {
return new Image("", height, width, ResolutionLevel.UNKNOWN);
}

private Image img(final String url, final ResolutionLevel resolutionLevel) {
return new Image(url, HEIGHT_UNKNOWN, WIDTH_UNKNOWN, resolutionLevel);
}

private Image img(final String url,
final int height,
final int width,
final ResolutionLevel resolutionLevel) {
return new Image(url, height, width, resolutionLevel);
}

private void assertChoosePreferredImage(final String low,
final String medium,
final String high,
final List<Image> images) {
assertEquals(low, choosePreferredImage(images, PreferredImageQuality.LOW));
assertEquals(medium, choosePreferredImage(images, PreferredImageQuality.MEDIUM));
assertEquals(high, choosePreferredImage(images, PreferredImageQuality.HIGH));
}


// CHECKSTYLE:OFF
@Test
public void testEstimatePixelCountAllKnown() {
assertEquals(20000.0, estimatePixelCount(img(100, 200), 1.0), 0.0);
assertEquals(20000.0, estimatePixelCount(img(100, 200), 12.0), 0.0);
assertEquals( 100.0, estimatePixelCount(img(100, 1), 12.0), 0.0);
assertEquals( 100.0, estimatePixelCount(img( 1, 100), 0.5), 0.0);
}

@Test
public void testEstimatePixelCountHeightUnknown() {
assertEquals( 10000.0, estimatePixelCount(img(HEIGHT_UNKNOWN, 100), 1.0 ), 0.0);
assertEquals( 20000.0, estimatePixelCount(img(HEIGHT_UNKNOWN, 200), 2.0 ), 0.0);
assertEquals( 10.0, estimatePixelCount(img(HEIGHT_UNKNOWN, 1), 0.1 ), 0.0);
assertEquals(230400.0, estimatePixelCount(img(HEIGHT_UNKNOWN, 640), 16.0/9.0), 0.0);
}

@Test
public void testEstimatePixelCountWidthUnknown() {
assertEquals( 10000.0, estimatePixelCount(img(100, WIDTH_UNKNOWN), 1.0 ), 0.0);
assertEquals( 20000.0, estimatePixelCount(img(200, WIDTH_UNKNOWN), 0.5 ), 0.0);
assertEquals( 12.0, estimatePixelCount(img( 1, WIDTH_UNKNOWN), 12.0 ), 0.0);
assertEquals(230400.0, estimatePixelCount(img(360, WIDTH_UNKNOWN), 16.0/9.0), 0.0);
}

@Test
public void testEstimatePixelCountAllUnknown() {
assertEquals(0.0, estimatePixelCount(img(HEIGHT_UNKNOWN, WIDTH_UNKNOWN), 1.0 ), 0.0);
assertEquals(0.0, estimatePixelCount(img(HEIGHT_UNKNOWN, WIDTH_UNKNOWN), 12.0 ), 0.0);
assertEquals(0.0, estimatePixelCount(img(HEIGHT_UNKNOWN, WIDTH_UNKNOWN), 0.1 ), 0.0);
assertEquals(0.0, estimatePixelCount(img(HEIGHT_UNKNOWN, WIDTH_UNKNOWN), 16.0/9.0), 0.0);
}
// CHECKSTYLE:ON


@Test
public void testChoosePreferredImageAllKnown() {
// the resolution level of the images is more important than the actual resolution
assertChoosePreferredImage("a", "b", "c", List.of(
img("a", 1, 1, ResolutionLevel.LOW),
img("b", 200, 200, ResolutionLevel.MEDIUM),
img("c", 10000, 10000, ResolutionLevel.HIGH)
));
assertChoosePreferredImage("a", "b", "c", List.of(
img("a", 10000, 10000, ResolutionLevel.LOW),
img("b", 200, 200, ResolutionLevel.MEDIUM),
img("c", 1, 1, ResolutionLevel.HIGH)
));

assertChoosePreferredImage("b", "c", "d", List.of(
img("a", 2, 1, ResolutionLevel.LOW),
img("b", 50, 25, ResolutionLevel.LOW),
img("c", 200, 100, ResolutionLevel.LOW),
img("d", 300, 150, ResolutionLevel.LOW)
));

assertChoosePreferredImage("c", "d", "d", List.of(
img("a", 2, 1, ResolutionLevel.MEDIUM),
img("b", 50, 25, ResolutionLevel.MEDIUM),
img("c", 60, 30, ResolutionLevel.MEDIUM),
img("d", 300, 150, ResolutionLevel.MEDIUM)
));
}

@Test
public void testChoosePreferredImageSomeKnown() {
// the resolution level of the images is more important than the actual resolution
assertChoosePreferredImage("a", "b", "c", List.of(
img("a", 1, WIDTH_UNKNOWN, ResolutionLevel.LOW),
img("b", HEIGHT_UNKNOWN, 200, ResolutionLevel.MEDIUM),
img("c", 10000, WIDTH_UNKNOWN, ResolutionLevel.HIGH)
));
assertChoosePreferredImage("a", "b", "c", List.of(
img("a", HEIGHT_UNKNOWN, 10000, ResolutionLevel.LOW),
img("b", 200, WIDTH_UNKNOWN, ResolutionLevel.MEDIUM),
img("c", HEIGHT_UNKNOWN, 1, ResolutionLevel.HIGH)
));

assertChoosePreferredImage("b", "c", "d", List.of(
img("a", HEIGHT_UNKNOWN, 1, ResolutionLevel.HIGH),
img("b", 50, WIDTH_UNKNOWN, ResolutionLevel.HIGH),
img("c", HEIGHT_UNKNOWN, 120, ResolutionLevel.HIGH),
img("d", 340, WIDTH_UNKNOWN, ResolutionLevel.HIGH)
));

assertChoosePreferredImage("c", "d", "d", List.of(
img("a", 2, WIDTH_UNKNOWN, ResolutionLevel.MEDIUM),
img("b", HEIGHT_UNKNOWN, 50, ResolutionLevel.MEDIUM),
img("c", 60, WIDTH_UNKNOWN, ResolutionLevel.MEDIUM),
img("d", HEIGHT_UNKNOWN, 340, ResolutionLevel.MEDIUM)
));
}

@Test
public void testChoosePreferredImageMixed() {
for (final ResolutionLevel resolutionLevel : RESOLUTION_LEVELS) {
assertChoosePreferredImage("d", "b", "c", List.of(
img("a", ResolutionLevel.UNKNOWN),
img("b", 200, 100, resolutionLevel),
img("c", 400, WIDTH_UNKNOWN, resolutionLevel),
img("d", HEIGHT_UNKNOWN, 50, resolutionLevel),
img("e", resolutionLevel)
));
}
for (final ResolutionLevel resolutionLevel : RESOLUTION_LEVELS) {
assertChoosePreferredImage("b", "b", "b", List.of(
img("a", ResolutionLevel.UNKNOWN),
img("b", 200, 100, resolutionLevel),
img("e", resolutionLevel)
));
}
assertChoosePreferredImage("b", "b", "e", List.of(
img("a", ResolutionLevel.UNKNOWN),
img("b", 200, 100, ResolutionLevel.LOW),
img("e", ResolutionLevel.HIGH)
));
}

@Test
public void testChoosePreferredImageAllUnknown() {
assertChoosePreferredImage("b", "c", "d", List.of(
img("a", ResolutionLevel.UNKNOWN),
img("b", ResolutionLevel.LOW),
img("c", ResolutionLevel.MEDIUM),
img("d", ResolutionLevel.HIGH)
));
assertChoosePreferredImage("c", "c", "d", List.of(
img("a", ResolutionLevel.UNKNOWN),
img("c", ResolutionLevel.MEDIUM),
img("d", ResolutionLevel.HIGH)
));
assertChoosePreferredImage("b", "c", "c", List.of(
img("a", ResolutionLevel.UNKNOWN),
img("b", ResolutionLevel.LOW),
img("c", ResolutionLevel.MEDIUM)
));

// UNKNOWN is avoided as much as possible
assertChoosePreferredImage("d", "d", "d", List.of(
img("a", ResolutionLevel.UNKNOWN),
img("d", ResolutionLevel.HIGH)
));
assertChoosePreferredImage("b", "b", "b", List.of(
img("a", ResolutionLevel.UNKNOWN),
img("b", ResolutionLevel.LOW)
));
assertChoosePreferredImage("a", "a", "a", List.of(
img("a", ResolutionLevel.UNKNOWN)
));
}
}

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