1 files changed, 31 insertions, 0 deletions
diff --git a/devtools/client/shadereditor/test/browser_webgl-actor-test-18.js b/devtools/client/shadereditor/test/browser_webgl-actor-test-18.js
new file mode 100644
index 000000000..977b07d86
--- /dev/null
+++ b/devtools/client/shadereditor/test/browser_webgl-actor-test-18.js
@@ -0,0 +1,31 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests the `getPixel` actor method works across threads.
+ */
+
+function* ifWebGLSupported() {
+  let { target, front } = yield initBackend(MULTIPLE_CONTEXTS_URL);
+  front.setup({ reload: true });
+
+  yield getPrograms(front, 2);
+
+  // Wait a frame to ensure rendering
+  yield front.waitForFrame();
+
+  let pixel = yield front.getPixel({ selector: "#canvas1", position: { x: 0, y: 0 }});
+  is(pixel.r, 255, "correct `r` value for first canvas.");
+  is(pixel.g, 255, "correct `g` value for first canvas.");
+  is(pixel.b, 0, "correct `b` value for first canvas.");
+  is(pixel.a, 255, "correct `a` value for first canvas.");
+
+  pixel = yield front.getPixel({ selector: "#canvas2", position: { x: 0, y: 0 }});
+  is(pixel.r, 0, "correct `r` value for second canvas.");
+  is(pixel.g, 255, "correct `g` value for second canvas.");
+  is(pixel.b, 255, "correct `b` value for second canvas.");
+  is(pixel.a, 255, "correct `a` value for second canvas.");
+
+  yield removeTab(target.tab);
+  finish();
+}