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func TestIt(t *testing.T){
    ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        w.Header().Set("Content-Type", "application/json")
        fmt.Fprintln(w, `{"fake twitter json string"}`)
    }))
    defer ts.Close()

    twitterUrl = ts.URL
    c := make(chan *twitterResult)
    go retrieveTweets(c)

    tweet := <-c
    if tweet != expected1 {
        t.Fail()
    }
    tweet = <-c
    if tweet != expected2 {
        t.Fail()
    }
}