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diff --git a/comm/mailnews/mime/test/unit/test_nsIMsgHeaderParser2.js b/comm/mailnews/mime/test/unit/test_nsIMsgHeaderParser2.js
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+++ b/comm/mailnews/mime/test/unit/test_nsIMsgHeaderParser2.js
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * Test suite for nsIMsgHeaderParser functions:
+ *   extractHeaderAddressMailboxes
+ *   extractFirstName
+ *   parseDecodedHeader
+ */
+
+var { MailServices } = ChromeUtils.import(
+  "resource:///modules/MailServices.jsm"
+);
+
+function run_test() {
+  // In this array, the sub arrays consist of the following elements:
+  // 0: input string (a comma separated list of recipients)
+  // 1: expected output from extractHeaderAddressMailboxes
+  // 2: list of recipient names in the string
+  // 3: first recipient name in the string
+  const checks = [
+    [
+      "abc@foo.invalid",
+      "abc@foo.invalid",
+      "abc@foo.invalid",
+      "abc@foo.invalid",
+    ],
+    ["foo <ghj@foo.invalid>", "ghj@foo.invalid", "foo", "foo"],
+    [
+      "abc@foo.invalid, foo <ghj@foo.invalid>",
+      "abc@foo.invalid, ghj@foo.invalid",
+      "abc@foo.invalid, foo",
+      "abc@foo.invalid",
+    ],
+    ["foo bar <foo@bar.invalid>", "foo@bar.invalid", "foo bar", "foo bar"],
+    [
+      "foo bar <foo@bar.invalid>, abc@foo.invalid, foo <ghj@foo.invalid>",
+      "foo@bar.invalid, abc@foo.invalid, ghj@foo.invalid",
+      "foo bar, abc@foo.invalid, foo",
+      "foo bar",
+    ],
+    // UTF-8 names
+    [
+      "foo\u00D0 bar <foo@bar.invalid>, \u00F6foo <ghj@foo.invalid>",
+      "foo@bar.invalid, ghj@foo.invalid",
+      "foo\u00D0 bar, \u00F6foo",
+      "foo\u00D0 bar",
+    ],
+    // More complicated examples drawn from RFC 2822
+    [
+      '"Joe Q. Public" <john.q.public@example.com>,Test <"abc!x.yz"@foo.invalid>, Test <test@[xyz!]>,"Giant; \\"Big\\" Box" <sysservices@example.net>',
+      'john.q.public@example.com, "abc!x.yz"@foo.invalid, test@[xyz!], sysservices@example.net',
+      'Joe Q. Public, Test, Test, Giant; "Big" Box',
+      // extractFirstName returns unquoted names, hence the difference.
+      "Joe Q. Public",
+    ],
+    // Bug 549931
+    [
+      "Undisclosed recipients:;",
+      "", // Mailboxes
+      "", // Address Names
+      "",
+    ], // Address Name
+  ];
+
+  // Test - empty strings
+
+  Assert.equal(MailServices.headerParser.extractHeaderAddressMailboxes(""), "");
+  Assert.equal(MailServices.headerParser.extractFirstName(""), "");
+
+  // Test - extractHeaderAddressMailboxes
+
+  for (let i = 0; i < checks.length; ++i) {
+    Assert.equal(
+      MailServices.headerParser.extractHeaderAddressMailboxes(checks[i][0]),
+      checks[i][1]
+    );
+    let _names = MailServices.headerParser
+      .parseDecodedHeader(checks[i][0])
+      .map(addr => addr.name || addr.email)
+      .join(", ");
+    Assert.equal(_names, checks[i][2]);
+    Assert.equal(
+      MailServices.headerParser.extractFirstName(checks[i][0]),
+      checks[i][3]
+    );
+  }
+}