1 files changed, 167 insertions, 0 deletions
diff --git a/dom/encoding/test/unit/test_rope_encode.js b/dom/encoding/test/unit/test_rope_encode.js
new file mode 100644
index 0000000000..185d23c792
--- /dev/null
+++ b/dom/encoding/test/unit/test_rope_encode.js
@@ -0,0 +1,167 @@
+var concat = [
+  {
+    head: "a",
+    tail: "b",
+    expected: "ab",
+    name: "Latin1 and Latin1",
+  },
+  {
+    head: "α",
+    tail: "β",
+    expected: "αβ",
+    name: "UTF-16 and UTF-16",
+  },
+  {
+    head: "a",
+    tail: "β",
+    expected: "aβ",
+    name: "Latin1 and UTF-16",
+  },
+  {
+    head: "α",
+    tail: "b",
+    expected: "αb",
+    name: "UTF-16 and Latin1",
+  },
+  {
+    head: "\uD83D",
+    tail: "\uDE03",
+    expected: "\uD83D\uDE03",
+    name: "Surrogate pair",
+  },
+  {
+    head: "a\uD83D",
+    tail: "\uDE03b",
+    expected: "a\uD83D\uDE03b",
+    name: "Surrogate pair with prefix and suffix",
+  },
+  {
+    head: "\uD83D",
+    tail: "b",
+    expected: "\uFFFDb",
+    name: "Unpaired high surrogate and Latin1",
+  },
+  {
+    head: "a\uD83D",
+    tail: "b",
+    expected: "a\uFFFDb",
+    name: "Prefixed unpaired high surrogate and Latin1",
+  },
+  {
+    head: "\uD83D",
+    tail: "β",
+    expected: "\uFFFDβ",
+    name: "Unpaired high surrogate and UTF-16",
+  },
+  {
+    head: "a\uD83D",
+    tail: "β",
+    expected: "a\uFFFDβ",
+    name: "Prefixed unpaired high surrogate and UTF-16",
+  },
+
+  {
+    head: "\uDE03",
+    tail: "b",
+    expected: "\uFFFDb",
+    name: "Unpaired low surrogate and Latin1",
+  },
+  {
+    head: "a\uDE03",
+    tail: "b",
+    expected: "a\uFFFDb",
+    name: "Prefixed unpaired low surrogate and Latin1",
+  },
+  {
+    head: "\uDE03",
+    tail: "β",
+    expected: "\uFFFDβ",
+    name: "Unpaired low surrogate and UTF-16",
+  },
+  {
+    head: "a\uDE03",
+    tail: "β",
+    expected: "a\uFFFDβ",
+    name: "Prefixed unpaired low surrogate and UTF-16",
+  },
+
+  {
+    head: "a",
+    tail: "\uDE03",
+    expected: "a\uFFFD",
+    name: "Latin1 and unpaired low surrogate",
+  },
+  {
+    head: "a",
+    tail: "\uDE03b",
+    expected: "a\uFFFDb",
+    name: "Latin1 and suffixed unpaired low surrogate",
+  },
+  {
+    head: "α",
+    tail: "\uDE03",
+    expected: "α\uFFFD",
+    name: "UTF-16 and unpaired low surrogate",
+  },
+  {
+    head: "α",
+    tail: "\uDE03b",
+    expected: "α\uFFFDb",
+    name: "UTF-16 and suffixed unpaired low surrogate",
+  },
+
+  {
+    head: "a",
+    tail: "\uD83D",
+    expected: "a\uFFFD",
+    name: "Latin1 and unpaired high surrogate",
+  },
+  {
+    head: "a",
+    tail: "\uD83Db",
+    expected: "a\uFFFDb",
+    name: "Latin1 and suffixed unpaired high surrogate",
+  },
+  {
+    head: "α",
+    tail: "\uD83D",
+    expected: "α\uFFFD",
+    name: "UTF-16 and unpaired high surrogate",
+  },
+  {
+    head: "α",
+    tail: "\uD83Db",
+    expected: "α\uFFFDb",
+    name: "UTF-16 and suffixed unpaired high surrogate",
+  },
+];
+
+var testingFunctions = Cu.getJSTestingFunctions();
+concat.forEach(function (t) {
+  test(function () {
+    assert_true(
+      testingFunctions.isSameCompartment(testingFunctions.newRope, this),
+      "Must be in the same compartment"
+    );
+    var rope = testingFunctions.newRope(t.head, t.tail);
+    var encoded = new TextEncoder().encode(rope);
+    var decoded = new TextDecoder().decode(encoded);
+    assert_equals(decoded, t.expected, "Must round-trip");
+  }, t.name);
+});
+
+test(function () {
+  assert_true(
+    testingFunctions.isSameCompartment(testingFunctions.newRope, this),
+    "Must be in the same compartment"
+  );
+  var ab = testingFunctions.newRope("a", "b");
+  var abc = testingFunctions.newRope(ab, "c");
+  var ef = testingFunctions.newRope("e", "f");
+  var def = testingFunctions.newRope("d", ef);
+  var abcdef = testingFunctions.newRope(abc, def);
+  var abcdefab = testingFunctions.newRope(abcdef, ab);
+  var encoded = new TextEncoder().encode(abcdefab);
+  var decoded = new TextDecoder().decode(encoded);
+  assert_equals(decoded, "abcdefab", "Must walk the DAG correctly");
+}, "Complex rope DAG");