Revised ImageDataTest to cover all constructors currently supported by firefox.

Author: c

tests-shared/src/main/scala/org/scalajs/dom/tests/shared/BrowserTests.scala

@@ -131,11 +131,41 @@ trait BrowserTests extends WebCryptoApiTests {
 
   @Test
   final def ImageDataTest(): Unit = {
+    // Test ImageDataConstructors
+    // from https://developer.mozilla.org/en-US/docs/Web/API/ImageData/ImageData
+
     import org.scalajs.dom.{ImageData, ImageDataSettings, PredefinedColorSpace}
     import PredefinedColorSpace._
 
-    val defaultImageData: ImageData = new ImageData(200, 100, new ImageDataSettings { colorSpace = `display-p3` })
-    assertEquals(defaultImageData.width, 200)
-    assertEquals(defaultImageData.height, 100)
+    val width:Int = 200
+    val height:Int = 100
+
+    // new ImageData(width, height)
+    val imgDat1: ImageData = new ImageData(width, height)
+    assertEquals(imgDat1.width, width)
+    assertEquals(imgDat1.height, height)
+    assertEquals(imgDat1.data.length, width * height * 4)
+
+    // new ImageData(width, height, settings) // Firefox doesn't support this constructor.
+    //  val defaultImageData: ImageData = new ImageData(width, height, new ImageDataSettings { colorSpace = `display-p3` })
+    //  assertEquals(defaultImageData.width, width)
+    //  assertEquals(defaultImageData.height, height)
+
+    // new ImageData(dataArray, width)
+    val imgDat2: ImageData = new ImageData(imgDat1.data, width)
+    assertEquals(imgDat2.width, width)
+    assertEquals(imgDat2.height, height)
+    assertEquals(imgDat2.data.length, width * height * 4)
+
+    // new ImageData(dataArray, width, height)
+    val imgDat3: ImageData = new ImageData(imgDat2.data, width, height)
+    assertEquals(imgDat3.width, width)
+    assertEquals(imgDat3.height, height)
+    assertEquals(imgDat3.data.length, width * height * 4)
+
+    // new ImageData(dataArray, width, height, settings)
+    val defaultImageData: ImageData = new ImageData(imgDat3.data, width, height, new ImageDataSettings { colorSpace = `display-p3` })
+    assertEquals(defaultImageData.width, width)
+    assertEquals(defaultImageData.height, height)
   }
 }