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Fluent interface for functional GUI testing
/*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
* Copyright 2012-2018 the original author or authors.
*/
package org.assertj.swing.internal.assertions;
import static org.assertj.core.data.Offset.offset;
import static org.assertj.core.util.Objects.areEqual;
import static org.assertj.swing.assertions.data.RgbColor.color;
import static org.assertj.swing.assertions.error.ShouldBeEqualColors.shouldBeEqualColors;
import static org.assertj.swing.assertions.error.ShouldBeEqualImages.shouldBeEqualImages;
import static org.assertj.swing.assertions.error.ShouldHaveDimension.shouldHaveDimension;
import static org.assertj.swing.assertions.error.ShouldNotBeEqualImages.shouldNotBeEqualImages;
import static org.assertj.swing.internal.assertions.ColorComparisonResult.ARE_EQUAL;
import static org.assertj.swing.internal.assertions.ColorComparisonResult.notEqual;
import java.awt.Dimension;
import java.awt.image.BufferedImage;
import org.assertj.core.api.AssertionInfo;
import org.assertj.core.data.Offset;
import org.assertj.core.error.ErrorMessageFactory;
import org.assertj.core.internal.Failures;
import org.assertj.core.internal.Objects;
import org.assertj.core.util.VisibleForTesting;
import org.assertj.swing.assertions.data.RgbColor;
/**
* Reusable assertions for {@link BufferedImage}s.
*
* @author Yvonne Wang
*/
public class Images {
private static final Images INSTANCE = new Images();
private static final Offset ZERO = offset(0);
/**
* Returns the singleton instance of this class.
*
* @return the singleton instance of this class.
*/
public static Images instance() {
return INSTANCE;
}
@VisibleForTesting
Failures failures = Failures.instance();
@VisibleForTesting
Images() {
}
/**
* Asserts that two images are equal. Two images are equal if:
*
* - they have equal size
* - the the RGB values of the color at each pixel are equal
*
*
* @param info contains information about the assertion.
* @param actual the actual image.
* @param expected the expected image.
* @throws AssertionError if the actual image is not equal to the expected one.
*/
public void assertEqual(AssertionInfo info, BufferedImage actual, BufferedImage expected) {
assertEqual(info, actual, expected, ZERO);
}
/**
* Asserts that two images are equal. Two images are equal if:
*
* - they have the same size
* - the difference between the RGB values of the color at each pixel is less than or equal to the given offset
*
*
* @param info contains information about the assertion.
* @param actual the actual image.
* @param expected the expected image.
* @param offset helps decide if the color of two pixels are similar: two pixels that are identical to the human eye
* may still have slightly different color values. For example, by using an offset of 1 we can indicate that
* a blue value of 60 is similar to a blue value of 61.
* @throws NullPointerException if the given offset is {@code null}.
* @throws AssertionError if the actual image is not equal to the expected one.
*/
public void assertEqual(AssertionInfo info, BufferedImage actual, BufferedImage expected, Offset offset) {
if (offset == null)
throw new NullPointerException("The given offset should not be null");
if (areEqual(actual, expected))
return;
if (actual == null || expected == null)
throw imagesShouldBeEqual(info, offset);
// BufferedImage does not have an implementation of 'equals,' which means that "equality" is verified by identity.
// We need to verify that two images are equal ourselves.
if (!haveEqualSize(actual, expected))
throw imageShouldHaveSize(info, actual, sizeOf(actual), sizeOf(expected));
ColorComparisonResult haveEqualColor = haveEqualColor(actual, expected, offset);
if (haveEqualColor == ARE_EQUAL)
return;
throw failures.failure(info, imagesShouldHaveEqualColor(haveEqualColor, offset));
}
private AssertionError imagesShouldBeEqual(AssertionInfo info, Offset offset) {
return failures.failure(info, shouldBeEqualImages(offset));
}
private ErrorMessageFactory imagesShouldHaveEqualColor(ColorComparisonResult r, Offset offset) {
return shouldBeEqualColors(r.color2, r.color1, r.point, offset);
}
/**
* Asserts that two images are not equal.
*
* @param info contains information about the assertion.
* @param actual the given image.
* @param other the object to compare {@code actual} to.
* @throws AssertionError if {@code actual} is equal to {@code other}.
*/
public void assertNotEqual(AssertionInfo info, BufferedImage actual, BufferedImage other) {
if (areEqual(actual, other))
throw imagesShouldNotBeEqual(info);
if (actual == null || other == null)
return;
if (!(haveEqualSize(actual, other)))
return;
ColorComparisonResult haveEqualColor = haveEqualColor(actual, other, ZERO);
if (haveEqualColor != ARE_EQUAL)
return;
throw imagesShouldNotBeEqual(info);
}
private AssertionError imagesShouldNotBeEqual(AssertionInfo info) {
return failures.failure(info, shouldNotBeEqualImages());
}
private boolean haveEqualSize(BufferedImage i1, BufferedImage i2) {
return i1.getWidth() == i2.getWidth() && i1.getHeight() == i2.getHeight();
}
private ColorComparisonResult haveEqualColor(BufferedImage i1, BufferedImage i2, Offset offset) {
int w = i1.getWidth();
int h = i1.getHeight();
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
RgbColor c1 = color(i1.getRGB(x, y));
RgbColor c2 = color(i2.getRGB(x, y));
if (c1.isEqualTo(c2, offset))
continue;
return notEqual(c1, c2, x, y);
}
}
return ARE_EQUAL;
}
/**
* Asserts that the size of the given image is equal to the given size.
*
* @param info contains information about the assertion.
* @param actual the given image.
* @param size the expected size of {@code actual}.
* @throws NullPointerException if the given size is {@code null}.
* @throws AssertionError if the size of the given image is not equal to the given size.
*/
public void assertHasSize(AssertionInfo info, BufferedImage actual, Dimension size) {
if (size == null)
throw new NullPointerException("The given size should not be null");
Objects.instance().assertNotNull(info, actual);
Dimension sizeOfActual = sizeOf(actual);
if (areEqual(sizeOfActual, size))
return;
throw imageShouldHaveSize(info, actual, sizeOfActual, size);
}
private AssertionError imageShouldHaveSize(AssertionInfo info, BufferedImage image, Dimension actual,
Dimension expected) {
return failures.failure(info, shouldHaveDimension(image, actual, expected));
}
@VisibleForTesting
static Dimension sizeOf(BufferedImage image) {
return new Dimension(image.getWidth(), image.getHeight());
}
}