added CS test file

+# A small subset of the run.js written in coffeescript
+
+do (casper) ->
+  steps = 0
+
+  casper.options.onStepComplete = -> steps++
+
+  casper.start "tests/site/index.html", ->
+    @test.assertTitle "CasperJS test index", "Casper.start() casper can start itself an open an url"
+    @test.assertEquals @fetchText("ul li"), "onetwothree", "Casper.fetchText() can retrieves text contents"
+    @click "a[href=\"test.html\"]"
+
+  casper.then ->
+    @test.assertTitle "CasperJS test target", "Casper.click() casper can click on a text link"
+    @click "a[href=\"form.html\"]"
+
+  casper.run ->
+    @test.assertEquals steps, 3, "Casper.options.onStepComplete() is called on step complete"
+    @options.onStepComplete = null
+    @test.done()
\ No newline at end of file