1 files changed, 25 insertions, 0 deletions
diff --git a/dom/tests/mochitest/bugs/utils_bug743615.js b/dom/tests/mochitest/bugs/utils_bug743615.js
new file mode 100644
index 0000000000..9a6f4af86f
--- /dev/null
+++ b/dom/tests/mochitest/bugs/utils_bug743615.js
@@ -0,0 +1,25 @@
+function makePattern(len, start, inc) {
+  var pattern = [];
+  while(len) {
+    pattern.push(start);
+    start = (start + inc) % 256;
+    --len;
+  }
+  return pattern;
+}
+
+function setPattern(imageData, pattern) {
+  if (pattern.length != imageData.data.length)
+    throw Error('Invalid pattern');
+  for (var i = 0; i < pattern.length; ++i)
+    imageData.data[i] = pattern[i];
+}
+
+function checkPattern(imageData, pattern) {
+  if (pattern.length != imageData.data.length)
+    throw Error('Invalid pattern');
+  for (var i = 0; i < pattern.length; ++i)
+    if (imageData.data[i] != pattern[i])
+      return false;
+  return true;
+}