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Implement screenshot comparison

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This change added the implementation of screenshot comparison with
ChromeWebDriver which will be used in the open-source code base.

This change also set a default window size(1200x2000) for each screenshot
test. This is to make the size of screenshot deterministic to help
build the screenshot comparison tests.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=235539713
This commit is contained in:
shicong 2019-02-25 09:04:42 -08:00 • committed by Weimin Yu
parent 7ddd8b55d2
commit 756a3b41e1
24 changed files with 385 additions and 28 deletions
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13
javatests/google/registry/webdriver/WebDriverRule.java
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@ -14,6 +14,7 @@
package google.registry.webdriver;
import static com.google.common.io.Resources.getResource;
import static java.util.stream.Collectors.joining;
import static org.apache.commons.text.StringEscapeUtils.escapeEcmaScript;
@ -29,6 +30,7 @@ import org.junit.runner.Description;
import org.junit.runners.model.Statement;
import org.openqa.selenium.By;
import org.openqa.selenium.Capabilities;
import org.openqa.selenium.Dimension;
import org.openqa.selenium.HasCapabilities;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.OutputType;
@ -59,6 +61,12 @@ public final class WebDriverRule extends ExternalResource
// number of pixels that vary (usually on the corners of "rounded" buttons or similar)
private static final int MAX_PIXEL_DIFF = 0;
// Default size of the browser window when taking screenshot. Having a fixed size of window can
// help make visual regression test deterministic.
private static final Dimension DEFAULT_WINDOW_SIZE = new Dimension(1200, 2000);
private static final String GOLDENS_PATH =
getResource(WebDriverRule.class, "scuba_goldens/chrome-linux").getFile();
private WebDriver driver;
private WebDriverPlusScreenDiffer webDriverPlusScreenDiffer;
@ -82,20 +90,21 @@ public final class WebDriverRule extends ExternalResource
@Override
protected void before() {
webDriverPlusScreenDiffer =
new ChromeWebDriverPlusScreenDiffer();
new ChromeWebDriverPlusScreenDiffer(GOLDENS_PATH, MAX_COLOR_DIFF, MAX_PIXEL_DIFF);
driver = webDriverPlusScreenDiffer.getWebDriver();
// non-zero timeout so findByElement will wait for the element to appear
driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);
driver.manage().window().setSize(DEFAULT_WINDOW_SIZE);
}
@Override
protected void after() {
webDriverPlusScreenDiffer.verifyAndQuit();
try {
driver.quit();
} finally {
driver = null;
}
webDriverPlusScreenDiffer.verifyAndQuit();
}
/** @see #get(String) */