diff --git a/test/builder_test.exs b/test/builder_test.exs
index 4272359..0742bd6 100644
--- a/test/builder_test.exs
+++ b/test/builder_test.exs
@@ -4,6 +4,45 @@ defmodule AutoLinker.BuilderTest do
 
   import AutoLinker.Builder
 
+  test "create_link/2" do
+    expected =
+      "<a href=\"http://text\" class=\"auto-linker\" target=\"_blank\" rel=\"noopener noreferrer\">text</a>"
+
+    assert create_link("text", %{}) == expected
+
+    expected = "<a href=\"http://text\" class=\"auto-linker\" target=\"_blank\">text</a>"
+    assert create_link("text", %{rel: nil}) == expected
+
+    expected =
+      "<a href=\"http://text\" class=\"auto-linker\" target=\"_blank\" rel=\"me\">text</a>"
+
+    assert create_link("text", %{rel: "me"}) == expected
+  end
+
+  test "create_markdown_links/2" do
+    expected =
+      "<a href='url' class=\"auto-linker\" target=\"_blank\" rel=\"noopener noreferrer\">text</a>"
+
+    assert create_markdown_links("[text](url)", %{}) == expected
+  end
+
+  test "format_hashtag/3" do
+    expected = "<a href=\"/t/girls\">#girls</a>"
+    assert format_hashtag(%{href: "/t/girls"}, "girls", nil) == expected
+  end
+
+  test "format_email/3" do
+    expected = "<a href=\"mailto:user@example.org\">mailto:user@example.org</a>"
+
+    assert format_email(%{href: "mailto:user@example.org"}, "mailto:user@example.org", nil) ==
+             expected
+  end
+
+  test "format_mention/3" do
+    expected = "<a href=\"url\">@user@host</a>"
+    assert format_mention(%{href: "url"}, "user@host", nil) == expected
+  end
+
   describe "create_phone_link" do
     test "finishes" do
       assert create_phone_link([], "", []) == ""
@@ -28,4 +67,17 @@ defmodule AutoLinker.BuilderTest do
       assert create_phone_link([["555.555.5555", ""], ["(555) 888-8888"]], phrase, []) == expected
     end
   end
+
+  test "create_mention_link/3" do
+    expected =
+      "<a href=\"/u/navi\" class=\"auto-linker\" target=\"_blank\" rel=\"noopener noreferrer\">@navi</a>"
+
+    assert create_mention_link("@navi", "hello @navi", %{mention_prefix: "/u/"}) == expected
+  end
+
+  test "create_email_link/3" do
+    expected = "<a href=\"mailto:user@example.org\" class=\"auto-linker\">user@example.org</a>"
+    assert create_email_link("user@example.org", %{}) == expected
+    assert create_email_link("user@example.org", %{href: "mailto:user@example.org"}) == expected
+  end
 end