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diff --git a/netwerk/test/unit/test_mozTXTToHTMLConv.js b/netwerk/test/unit/test_mozTXTToHTMLConv.js
new file mode 100644
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+++ b/netwerk/test/unit/test_mozTXTToHTMLConv.js
@@ -0,0 +1,199 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Test that mozITXTToHTMLConv works properly.
+ */
+
+var Cc = Components.classes;
+var Ci = Components.interfaces;
+
+function run_test() {
+  let converter = Cc["@mozilla.org/txttohtmlconv;1"]
+                     .getService(Ci.mozITXTToHTMLConv);
+
+  const scanTXTtests = [
+    // -- RFC1738
+    {
+      input: "RFC1738: <URL:http://mozilla.org> then",
+      url: "http://mozilla.org"
+    },
+    // -- RFC2396E
+    {
+      input: "RFC2396E: <http://mozilla.org/> then",
+      url: "http://mozilla.org/"
+    },
+    // -- abbreviated
+    {
+      input: "see www.mozilla.org maybe",
+      url: "http://www.mozilla.org"
+    },
+    // -- freetext
+    {
+      input:"I mean http://www.mozilla.org/.",
+      url: "http://www.mozilla.org/"
+    },
+    {
+      input:"you mean http://mozilla.org:80, right?",
+      url: "http://mozilla.org:80"
+    },
+    {
+      input:"go to http://mozilla.org; then go home",
+      url: "http://mozilla.org"
+    },
+    {
+      input:"http://mozilla.org! yay!",
+      url: "http://mozilla.org"
+    },
+    {
+      input:"er, http://mozilla.com?",
+      url: "http://mozilla.com"
+    },
+    {
+      input:"http://example.org- where things happen",
+      url: "http://example.org"
+    },
+    {
+      input:"see http://mozilla.org: front page",
+      url: "http://mozilla.org"
+    },
+    {
+      input:"'http://mozilla.org/': that's the url",
+      url: "http://mozilla.org/"
+    },
+    {
+      input:"some special http://mozilla.org/?x=.,;!-:x",
+      url: "http://mozilla.org/?x=.,;!-:x"
+    },
+    {
+      // escape & when producing html
+      input:"'http://example.org/?test=true&success=true': ok",
+      url: "http://example.org/?test=true&amp;success=true"
+    },
+    {
+      input: "bracket: http://localhost/[1] etc.",
+      url: "http://localhost/"
+    },
+    {
+      input: "parenthesis: (http://localhost/) etc.",
+      url: "http://localhost/"
+    },
+    {
+      input: "(thunderbird)http://mozilla.org/thunderbird",
+      url: "http://mozilla.org/thunderbird"
+    },
+    {
+      input: "()http://mozilla.org",
+      url: "http://mozilla.org"
+    },
+    {
+      input: "parenthesis included: http://kb.mozillazine.org/Performance_(Thunderbird) etc.",
+      url: "http://kb.mozillazine.org/Performance_(Thunderbird)"
+    },
+    {
+      input: "parenthesis slash bracket: (http://localhost/)[1] etc.",
+      url: "http://localhost/"
+    },
+    {
+      input: "parenthesis bracket: (http://example.org[1]) etc.",
+      url: "http://example.org"
+    },
+    {
+      input: "ipv6 1: https://[1080::8:800:200C:417A]/foo?bar=x test",
+      url: "https://[1080::8:800:200C:417A]/foo?bar=x"
+    },
+    {
+      input: "ipv6 2: http://[::ffff:127.0.0.1]/#yay test",
+      url: "http://[::ffff:127.0.0.1]/#yay"
+    },
+    {
+      input: "ipv6 parenthesis port: (http://[2001:db8::1]:80/) test",
+      url: "http://[2001:db8::1]:80/"
+    },
+    {
+      input: "test http://www.map.com/map.php?t=Nova_Scotia&markers=//Not_a_survey||description=plm2 test",
+      url: "http://www.map.com/map.php?t=Nova_Scotia&amp;markers=//Not_a_survey||description=plm2"
+    }
+  ];
+
+  const scanHTMLtests = [
+    {
+      input: "http://foo.example.com",
+      shouldChange: true
+    },
+    {
+      input: " <a href='http://a.example.com/'>foo</a>",
+      shouldChange: false
+    },
+    {
+      input: "<abbr>see http://abbr.example.com</abbr>",
+      shouldChange: true
+    },
+    {
+      input: "<!-- see http://comment.example.com/ -->",
+      shouldChange: false
+    },
+    {
+      input: "<!-- greater > -->",
+      shouldChange: false
+    },
+    {
+      input: "<!-- lesser < -->",
+      shouldChange: false
+    },
+    {
+      input: "<style id='ex'>background-image: url(http://example.com/ex.png);</style>",
+      shouldChange: false
+    },
+    {
+      input: "<style>body > p, body > div { color:blue }</style>",
+      shouldChange: false
+    },
+    {
+      input: "<script>window.location='http://script.example.com/';</script>",
+      shouldChange: false
+    },
+    {
+      input: "<head><title>http://head.example.com/</title></head>",
+      shouldChange: false
+    },
+    {
+      input: "<header>see http://header.example.com</header>",
+      shouldChange: true
+    },
+    {
+      input: "<iframe src='http://iframe.example.com/' />",
+      shouldChange: false
+    },
+    {
+      input: "broken end <script",
+      shouldChange: false
+    },
+  ];
+
+  function hrefLink(url) {
+    return ' href="' + url + '"';
+  }
+
+  for (let i = 0; i < scanTXTtests.length; i++) {
+    let t = scanTXTtests[i];
+    let output = converter.scanTXT(t.input, Ci.mozITXTToHTMLConv.kURLs);
+    let link = hrefLink(t.url);
+    if (output.indexOf(link) == -1)
+      do_throw("Unexpected conversion by scanTXT: input=" + t.input +
+               ", output=" + output + ", link=" + link);
+  }
+
+  for (let i = 0; i < scanHTMLtests.length; i++) {
+    let t = scanHTMLtests[i];
+    let output = converter.scanHTML(t.input, Ci.mozITXTToHTMLConv.kURLs);
+    let changed = (t.input != output);
+    if (changed != t.shouldChange) {
+      do_throw("Unexpected change by scanHTML: changed=" + changed +
+               ", shouldChange=" + t.shouldChange +
+               ", \ninput=" + t.input +
+               ", \noutput=" + output);
+    }
+  }
+}