feat: allow-browser-screenshot-config

src/Configuration.php

@@ -124,4 +124,34 @@ public function diff(): self
 
         return $this;
     }
+
+    public function screenshotThreshold(float $threshold): self
+    {
+        Playwright::setScreenshotThreshold($threshold);
+
+        return $this;
+    }
+
+    /**
+     * Playwright will use MaxDiffPixels if non 0 and MaxDiffPixelRatio is not set
+     * else if both are set, it will choose the lower of the two
+     * else if none set it will have zero tolerance
+     *
+     * @see node_modules/playwright-core/lib/server/utils/comparators.js:88
+     *
+     * @return $this
+     */
+    public function screenshotMaxDiffPixels(?int $maxDiffPixels): self
+    {
+        Playwright::setScreenshotMaxDiffPixels($maxDiffPixels);
+
+        return $this;
+    }
+
+    public function screenshotMaxDiffPixelRatio(float $maxDiffPixelRatio): self
+    {
+        Playwright::setScreenshotMaxDiffPixelRatio($maxDiffPixelRatio);
+
+        return $this;
+    }
 }

src/Playwright/Page.php

@@ -281,7 +281,7 @@ public function waitForURL(string $url): self
     }
 
     /**
-     * Adds a script tag to the page.
+     * Adds a style tag to the page.
      */
     public function addStyleTag(string $content): self
     {
@@ -521,9 +521,9 @@ public function expectScreenshot(bool $fullPage, bool $openDiff): void
                     'timeout' => 30000,
                     'isNot' => false,
                     'comparisonMethod' => 'pixelmatch',
-                    'threshold' => 0.3,
-                    'maxDiffPixels' => 300,
-                    'maxDiffPixelRatio' => 0.01,
+                    'threshold' => Playwright::screenshotThreshold(),
+                    'maxDiffPixels' => Playwright::screenshotMaxDiffPixels(),
+                    'maxDiffPixelRatio' => Playwright::screenshotMaxDiffPixelRatio(),
                     'detectAntialiasing' => true,
                     'forceSameDimensions' => true,
                 ]
@@ -550,19 +550,8 @@ public function expectScreenshot(bool $fullPage, bool $openDiff): void
                 }
             }
 
-            $this->createImageDiffView(
-                $snapshotName,
-                $expectedImageBlob,
-                $actualImageBlob,
-                ImageDiffView::missingImage(),
-                $openDiff,
-            );
-
-            throw new ExpectationFailedException(<<<'EOT'
-                Screenshot does not match the last one.
-                  - Expected? Update the snapshots with [--update-snapshots].
-                EOT,
-            );
+            // if there is no diff at this point, Playwright has determined that there are no changes worthy of investigating
+            // (based on the config passed in to expectScreenshot) so we consider this a pass
         }
     }
 

src/Playwright/Playwright.php

@@ -59,6 +59,23 @@ final class Playwright
      */
     private static ?string $host = null;
 
+    /**
+     * The default screenshot threshold
+     */
+    private static float $screenshotThreshold = 0.3;
+
+    /**
+     * Default maximum number of total pixels that can be different
+     * ENHANCE: establish a good actual baseline for this, leaving at the current Pest default of 300 which is very generous
+     * ENHANCE: establish a way to allow this to be undefined in JS to let the pixel ratio take precedence
+     */
+    private static ?int $screenshotMaxDiffPixels = 300;
+
+    /**
+     * The maximum ratio of pixels that can differ (superseded by $screenshotMaxDiffPixels)
+     */
+    private static float $screenshotMaxDiffPixelRatio = 0.01;
+
     /**
      * Get a browser factory for the given browser type.
      */
@@ -213,6 +230,64 @@ public static function defaultBrowserType(): BrowserType
         return self::$defaultBrowserType;
     }
 
+    /**
+     * Set the screenshot threshold used for screenshot comparison
+     *
+     * @see https://playwright.dev/docs/api/class-locatorassertions#locator-assertions-to-have-screenshot-2-option-threshold
+     */
+    public static function setScreenshotThreshold(float $threshold): void
+    {
+        self::$screenshotThreshold = max(0, min(1, $threshold));
+    }
+
+    /**
+     * get the browser screenshot threshold
+     */
+    public static function screenshotThreshold(): float
+    {
+        return self::$screenshotThreshold;
+    }
+
+    /**
+     * An acceptable amount of pixels that could be different.
+     *
+     * @see https://playwright.dev/docs/api/class-pageassertions#page-assertions-to-have-screenshot-1-option-max-diff-pixels
+     */
+    public static function setScreenshotMaxDiffPixels(?int $maxDiffPixels): void
+    {
+        self::$screenshotMaxDiffPixels = max(0, $maxDiffPixels);
+    }
+
+    /**
+     * An acceptable ratio of pixels that are different to the total amount of pixels,
+     *
+     * get the browser screenshot maxDiffPixels
+     */
+    public static function screenshotMaxDiffPixels(): ?int
+    {
+        return self::$screenshotMaxDiffPixels;
+    }
+
+    /**
+     * An acceptable amount of pixels that could be different.
+     *
+     * @see https://playwright.dev/docs/api/class-pageassertions#page-assertions-to-have-screenshot-1-option-max-diff-pixel-ratio
+     */
+    public static function setScreenshotMaxDiffPixelRatio(float $maxDiffPixelRatio): void
+    {
+        self::$screenshotMaxDiffPixelRatio = max(0, $maxDiffPixelRatio);
+    }
+
+    /**
+     * An acceptable ratio of pixels that are different to the total amount of pixels,
+     *
+     * get the browser screenshot maxDiffPixels
+     */
+    public static function screenshotMaxDiffPixelRatio(): float
+    {
+        return self::$screenshotMaxDiffPixelRatio;
+    }
+
     /**
      * Executes a callback with a temporary timeout.
      *

tests/.pest/snapshots/Browser/Webpage/AssertScreenshotGranularityCanBeControlledTest/it_does_not_match_a_screenshot_when_outside_the_tolerance.snap

@@ -0,0 +1 @@
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