diff --git a/.gitignore b/.gitignore
index 435f07c..cca9353 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,3 @@
 *.hi
 *.o
 dist
-# executable
-test
diff --git a/test/main.hs b/test/main.hs
new file mode 100644
index 0000000..6ec99f3
--- /dev/null
+++ b/test/main.hs
@@ -0,0 +1,78 @@
+{-# LANGUAGE OverloadedStrings #-}
+import Text.HTML.SanitizeXSS
+import Text.HTML.SanitizeXSS.Css
+import Data.Text (Text)
+import Data.Text as T
+
+import Test.Hspec.Monadic
+import Test.Hspec.HUnit ()
+import Test.HUnit (assert, (@?=), Assertion)
+
+test :: (Text -> Text) -> Text -> Text -> Assertion
+test f actual expected = do
+  let result = f actual
+  result @?= expected
+
+sanitized = test sanitize
+
+main = hspecX $ do
+  describe "html sanitizing" $ do
+    it "big test" $ do
+      let testHTML = " <a href='http://safe.com'>safe</a><a href='unsafe://hack.com'>anchor</a> <img src='evil://evil.com' /> <unsafe></foo> <bar /> <br></br> <b>Unbalanced</div><img src='http://safe.com'>"
+      test sanitizeBalance testHTML " <a href=\"http://safe.com\">safe</a><a>anchor</a> <img />   <br /> <b>Unbalanced<div></div><img src=\"http://safe.com\"></b>"
+      sanitized testHTML " <a href=\"http://safe.com\">safe</a><a>anchor</a> <img />   <br /> <b>Unbalanced</div><img src=\"http://safe.com\">"
+
+    it "relativeURI" $ do
+      let testRelativeURI = "<a href=\"foo\">bar</a>"
+      sanitized testRelativeURI testRelativeURI
+
+    it "protocol hack" $
+      sanitized "<script src=//ha.ckers.org/.j></script>" ""
+
+    it "object hack" $
+      sanitized "<object classid=clsid:ae24fdae-03c6-11d1-8b76-0080c744f389><param name=url value=javascript:alert('XSS')></object>" ""
+
+    it "embed hack" $
+      sanitized "<embed src=\"data:image/svg+xml;base64,PHN2ZyB4bWxuczpzdmc9Imh0dH A6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcv MjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hs aW5rIiB2ZXJzaW9uPSIxLjAiIHg9IjAiIHk9IjAiIHdpZHRoPSIxOTQiIGhlaWdodD0iMjAw IiBpZD0ieHNzIj48c2NyaXB0IHR5cGU9InRleHQvZWNtYXNjcmlwdCI+YWxlcnQoIlh TUyIpOzwvc2NyaXB0Pjwvc3ZnPg==\" type=\"image/svg+xml\" AllowScriptAccess=\"always\"></embed>" ""
+
+    it "ucase image hack" $
+      sanitized "<IMG src=javascript:alert('XSS') />" "<img />"
+
+  describe "allowedCssAttributeValue" $ do
+    it "allows hex" $ do
+      assert $ allowedCssAttributeValue "#abc"
+      assert $ allowedCssAttributeValue "#123"
+      assert $ not $ allowedCssAttributeValue "abc"
+      assert $ not $ allowedCssAttributeValue "123abc"
+
+    it "allows rgb" $ do
+      assert $ allowedCssAttributeValue "rgb(1,3,3)"
+      assert $ not $ allowedCssAttributeValue "rgb()"
+
+    it "allows units" $ do
+      assert $ allowedCssAttributeValue "10 px"
+      assert $ not $ allowedCssAttributeValue "10 abc"
+
+  describe "css sanitizing" $ do
+    it "removes style when empty" $
+      sanitized "<p style=''></p>" "<p></p>"
+
+    it "allows any non-url value for white-listed properties" $ do
+      let whiteCss = "<p style=\"letter-spacing:foo-bar;text-align:10million\"></p>"
+      sanitized whiteCss whiteCss
+
+    it "rejects any url value" $ do
+      let whiteCss = "<p style=\"letter-spacing:foo url();text-align:url(http://example.com)\"></p>"
+      sanitized whiteCss "<p style=\"letter-spacing:foo \"></p>"
+
+    it "rejects properties not on the white list" $ do
+      let blackCss = "<p style=\"anything:foo-bar;other-stuff:10million\"></p>"
+      sanitized blackCss "<p></p>"
+
+    it "rejects invalid units for grey-listed css" $ do
+      let greyCss = "<p style=\"background:foo-bar;border:10million\"></p>"
+      sanitized greyCss "<p></p>"
+
+    it "allows valid units for grey-listed css" $ do
+      let grey2Css = "<p style=\"background:1;border-foo:10px\"></p>"
+      sanitized grey2Css grey2Css